You forgot to add "assuming no air resistance" to this!
@Levon_Johnson
7 жыл бұрын
It didn't matter in the experiment, due to the fact that the balls were basically the same surface area. Though yes, in a perfect experiment, and theoretically, it requires a null air resistance value.
@sacha7601
7 жыл бұрын
but friction is the same force applied to 2 object of different weight. So friction has more effect on the basket ball. It's just negligeable for both
@Nanninone
7 жыл бұрын
Thanks!
@Badg3r001
7 жыл бұрын
I was completely over thinking this one because I thought them falling at the same rate was far too obvious. So I tried to reason that the air resistance would have less effect on the heavier ball as, despite the same surface area, it also had greater inertia.
@berkancakan
7 жыл бұрын
@ Tom Badger You are TOTALLY RIGHT, drop these balls from 1000meters and the heavier one will hit the ground first, because it's terminal velocity is greater. imagine dropping a basketball and an air filled ballon, they have the same size so they should fall at the same speed right? No because the baloon doesn't have enough force to "push" away the air in a vacuum they would fall at the same speed of course
@stevengreidinger8295
4 жыл бұрын
I liked seeing how instead of making the people who didn't know feel bad, he was able to interest them.
@brianreinhardt701
3 жыл бұрын
Excellent progression of understanding for the woman who first thought the medicine ball would hit the ground first, saw that she was incorrect and said she "needs to read more books", then proposed the idea of "maybe the weight is holding it back", then finishes by saying "like a heavy car that doesn't want to accelerate". I can only imagine that Newton himself went through this line of thinking. Nice job making this happen Derek, and the woman is impressive that she used prior knowledge to grow her understanding...out of everyone in this video, she's the most likely to remember this idea.
@higorss
3 жыл бұрын
Hey man, I'm gonna ask something to you because your comment is the most recent. It's true that the 5kg ball is, in fact, falling slower to earth? But the difference is so small that we just ignore it? I mean, let's suppose a ball the size and mass of the earth, and a ball that weight 1kg. The earth-sized ball would fall towards earth at 4,5 m/s and the earth would fall towards the ball at 4,5 m/s too, right? Now let's go back to the 5kg and 1kg ball. Considering that the 1kg ball would fall at 10 m/s. It's correct to say that the 5kg ball would fall at 9,999999... m/s?
@brianreinhardt701
3 жыл бұрын
We can certainly ignore that difference. It's true that each ball and the earth approach each other at the same rate. I'd be interested to look longer at it and study how the acceleration of each ball in the system is affected knowing that we released each ball at the same time. In that case, the earth is only accelerating once, and not an infinitesimal amount "more" for the heavier ball. Either way, you showed how much it's absolutely fine to ignore it in the numbers you used. If the difference is .00000001 m/s/s, then that falls far within the margin for error that we're already allowing ourselves by calling the acceleration 10 m/s/s instead of 9.81 m/s/s. Certainly in my experience, it's most important to help people who are just learning this concept to understand the fact that all things acceleration toward the earth at the same rate (as Derek does here), rather than introduce the lesser affecting and more complicated aspects of the acceleration of the earth itself, or even air resistance. Air resistance can be introduced after this concept is mastered. The acceleration of the earth toward the ball can be considered as soon as they start working with falling objects that are hundreds of billions of pounds or more,, and will start to make the earth accelerate at a noticeable amount.
@austinmoser5056
8 жыл бұрын
if u dropped the balls from high enough then the terminal velocity of the medicine ball would exceed that of the basketball and therefore would hit the ground first
@blahblahtoucan5329
8 жыл бұрын
ikr!
@Felixfex
8 жыл бұрын
+Austin Moser thats right if you do it with air resistance,but without air everything falls with the same acceleration (9,81 cm/s^2)
@austinmoser5056
8 жыл бұрын
Felixfex I guess that's true
@HevadeWe
8 жыл бұрын
+Felixfex Except if the ball wasn't dropped on earth, or when it has a mass large enough to influence gravity itself :P
@tonypilborg
8 жыл бұрын
Not so sure there... Obviously the drag from the air resistance would be relatively less on the heavy object (the drags the same, but the forces + inertia in play are much larger for the heavy object) - BUT, for this to hold true you have to know that they indeed hold equal aerodynamic properties. And the don't, since that comes down to surface material and "layout".. And perhaps the basketballs small "knobs" could give a similar effect to the dimples in a golfball.... (thus reducing drag substantially)..
@0YouCanCallMeAl0
9 жыл бұрын
Except they really don't fall at the same time, because you know, air.
@comedyforage
9 жыл бұрын
***** They're pretty much the exact same shape and size so, you know, they do.
@0YouCanCallMeAl0
9 жыл бұрын
Nope, they don't, because of conservation of momentum. Momentum depends on mass and velocity. The mass of the object does not change as it falls obviously, but velocity of the lighter ball increases ever so slightly slower (and tops out earlier, it has smaller terminal velocity, google it, the equation clearly shows it depends on mass) because the ball collides with air particles as it falls, and these collisions follow the conservation of momentum principle. Each such collision detracts from the momentum of the ball and given that it cannot detract from it's mass, it detracts from it's velocity. The less mass the ball has, the more it's velocity contributes to it's momentum, so the lighter it is the more momentum it loses. The only environment where they do fall at the same time is vacuum. Of course these effects are negligible at the distance he's using, but they are there and I would expect from him to do better and mention them. Have you seen the experiment with a ping pong ball hovering atop a stream of air? That's basically falling in place, like skydiving in a wind tunnel. Now replace that ball with a lead ball of same size and shape. You think it'll still hover? Mass matters, if there's a fluid (water, air, whatever) in which the object is moving.
@swedneck
9 жыл бұрын
***** except the difference is, you know, milliseconds.
@HerraTohtori
9 жыл бұрын
+Tim Stahel (Moustached Viking) That would depend on how long a distance they drop, and their mass - essentially, how close to their terminal velocities they get, and how big the difference between their terminal velocities is. You're correct that with a drop of about two metres, there wouldn't be much of a difference caused by the air, and it can be an useful demonstration about gravitational acceleration being constant. But trying to "remove" drag from the picture entirely just leads to further misconceptions because it's easy to see situations that obviously don't follow the false "rule" that things always drop with the same acceleration. Consider a different experiment setup - what if you dropped a balloon filled with air, and a balloon filled with water? Both of them are the same shape and size, just like the balls in this video. Should they fall at the same rate of acceleration as well? Or is there something that the "simplified" model doesn't take into account? Even when you add drag into the model, that's still not quite a full model about the situation. What about a balloon filled with helium, how fast would that drop in comparison to the air and water balloon of same size?
@comedyforage
9 жыл бұрын
HerraTohtori I see your point, but I think the best way to look at this is to consider the experiment which was done on the moon in 1969. A hammer and a feather were dropped at the same time to demonstrate that the speed which an object falls at in a vacuum is unrelated to it's mass (although you can get nitpicky and point out that there is an atmosphere on the moon, however thin it may be). This is a major point which people don't know or understand about basic physics, though if it were not true, planes would not fly and parachutes would not work.
@alicehsuyaju
10 жыл бұрын
you could ask them "what will happen if you tie these two balls together",there might be two answers: 1. they'll go faster, because their weight adds up 2. they'll go by their average speed, because the lighter one is pulling upward while the heavier one wants to go faster so there, you can easily explain and make people feel that there's somehow wrong with it
@willoughbykrenzteinburg
10 жыл бұрын
Are you saying that one of these two things will happen?
@alicehsuyaju
10 жыл бұрын
Willoughby Krenzteinburg i'm saying that a thought experiment could easily show that "heavier falls faster" is wrong
@willoughbykrenzteinburg
10 жыл бұрын
Ok. Gotcha
@betongitarre
10 жыл бұрын
That´s how Galilieo argued in his Discorsi. :)
@renancunha4799
4 жыл бұрын
@@alicehsuyaju The problem is that the havier indeed falls faster! A lot of people are saying, and correctly so, that mass plays a central role, because the air resistances acts in such a way that terminal velocity depends on mass. From same height, the lighter reaches terminal velocity first and therefore has less time in accelerated motion. Then it takes longer to fall.
@Elf_Pyro
8 жыл бұрын
i thought everyone knew this
@tomc.5704
8 жыл бұрын
+Elf Pyro As xkcd pointed out, if everyone knows it, 10,000 people have to learn it every day
@Elf_Pyro
8 жыл бұрын
true but it was a hyperbole
@emerald3616
8 жыл бұрын
+Elf Pyro i thought so too... also when some says everyone they dont mean everyone.
@tomc.5704
8 жыл бұрын
So, what, when someone implies that a video was pointless because "everyone knew this", it's all okay because they didn't mean what they said? In any case, it's a casual comment on KZitem and we all know what was meant. I mean, heck, I've known about this since probably 4th or 5th grade and am surprised that they were able to find so many people who didn't understand it.
@emerald3616
8 жыл бұрын
think of it more like a saying. its impossible to have Everybody something so we just say it as more than alot.
@plixplop
3 жыл бұрын
Very interesting, I never thought of it this way but it makes a lot of sense. Objects with more mass take more force to accelerate up to X speed when pushed on wheels over a smooth floor... but the same acceleration delay applies to gravity accelerating the object in freefall. Crazy! Great explanation.
@Mikineitor
10 жыл бұрын
That is only true on vacuum. The air drag actually makes the basketball slower, and its terminal speed would be much lower than the black ball, so in a taller drop you could see a very important difference. I think you have actually caused more misconceptions with this particular video than the ones you ended.
@Mikineitor
9 жыл бұрын
Yes, but: The gravity force depends on the mass of the object, and the acceleration depends on both the mass and the force. The heavier ball gets more force, but also needs more force to move so it actually moves with the same acceleration. The air drag is, as you said about the same for both (perhaps a very small difference due to the shape and aerodynamics). Now, the heavier the object, the air drag remains constant, but the gravity force grows, so the less impact the air drag has on it. On vacuum, one balloon full of air and one full of lead will fall with the same acceleration. Not so if immerse on a fluid or gas, like our atmosophere.
@Mikineitor
9 жыл бұрын
Vladimir Pryshlyak Thanks man! Happy to be of use. Un saludo desde España
@tareke586
9 жыл бұрын
Actually the heavier Ball would Fall faster because the lighter Ball needs less air to fly (just like an airplane)
@upgoon4015
9 жыл бұрын
Vladimir Pryshlyak weight is how gravity affects the object F=mg weight is f g is gravity and m is the mass of the object
@ericprobinson
9 жыл бұрын
They are not talking about terminal velocity. Why do people who are educated beyond their intelligence make arguments about things that are not even in the presentation.
@RacecarsAndRicefish
10 жыл бұрын
Do most people just not take physics classes ever? I feel like asking which would hit the ground first is like asking what 1 times 0 is...
@dye4na
7 жыл бұрын
pcakes I guess it's 1
@aidang4509
4 жыл бұрын
pcakes no , unfortunately with the current education system we’re taught only to remember certain things and use fancy key words as a test of intelligence in a test. We don’t get full understanding on how and why things happen most of the time. E.g all objects will fall at the same time due to inertia ignoring air resistance. So when a feather and bowling ball are dropped, the feather will land past due to air resistance which comes from the surface area, so if you took a sheet of paper and a notebook- both size A4- why does the sheet fall second, considering they have the same surface area. I’m not trying to single you out but prove to you that we don’t have full understanding on how things actually work
@dogeyexists
4 жыл бұрын
I'm only in 7th grade so I'm not taking physics classes yet ._.
@RacecarsAndRicefish
4 жыл бұрын
@@dogeyexists ok doge that's fair im sorry
@brunojambeiro6776
4 жыл бұрын
Van What country are you from ?
@MultiSciGeek
8 жыл бұрын
How do people not know this? Or do you edit out all the other 1000 people who knew this?
@hughmongusfungusamongus2439
8 жыл бұрын
I'm sure he cut out all of the people who knew the answer.
@MultiSciGeek
8 жыл бұрын
Some Guy I get the same feeling for every video.
@cyancoyote7366
8 жыл бұрын
No, people are just stupid.
@Robert-ry6xe
8 жыл бұрын
I think he goes to an area where he knows people are dumb.
@MultiSciGeek
8 жыл бұрын
THE ZOMBIE TRAINER Hahaha
@simopelle
2 жыл бұрын
Another way of seeing this: _F=mg_ The acceleration _(g=9.81)_ is the same for every object on the earth surface, so they will fall exactly at the same speed (if they are the same volume or there's no air resistance). Although the force of gravity does depend on the mass, as explained by Derek on the basketball there's a smaller force pushing on a smaller mass (same acceleration: _g=F/m=2F/2m_ and so on).
@BN99239
2 жыл бұрын
It's not even that the object is falling towards earth, it's that the earth accelerates towards the object as it moves through space. When we hold an object up with our hand, our body is connected to the earth so the object is also being pushed by the earth through our body, but the moment we let it go, the earth comes smashing into it, at 9.8m/s^2. So regardless of how massive an object is, the earth will accelerate towards it at the same rate.
@holomurphy22
2 жыл бұрын
@@BN99239 no... If your object has the mass of the earth, the earth will fall at 2*9.81 m/s^2 towards the object (in the reference frame of the object). In such a reference frame you actually "add up" the accelerations I'm not sure about what you wrote but when you hold an object, your body is actually pushing it upwards. The earth doesnt pull it through our body but pulls it down despite our body. The earth also pulls you down, but the ground pulls you up. Etc.
@joaotanaka3071
2 жыл бұрын
My Physics teacher explained me this way: According to Newton's second law, Resultant Force= Mass.Acceleration So, if we disconsider air resistance, the only acting force to the body is weigh, wich is Mass.Gravity. So, in short: M.A=M.G In this equation, as we have the same value of mass in both sides, we can disconsider it, so basically, A=G Remember, this only disconsiderating air resistance and assuming that Weigh is the only acting force to the body in free fall. Also, an experiment in the moon showed this. Astronalts dropped a hammer and a feather at the same time, and as there is no air resistance in the moon, both got to the ground at the same time. Note: Sorry if I've ever used any wrong term, English isn't my first language, and I don't know the exactly translation of this terms to English.
@holomurphy22
2 жыл бұрын
@@joaotanaka3071 that's correct
@brendanward2991
8 жыл бұрын
I had no idea there were so many Aristotelians out there!
@CountArtha
7 жыл бұрын
Galileo would be ashamed.
@ankitdhaker4946
3 жыл бұрын
😂😂😂
@cocozeng3039
4 жыл бұрын
How could these people possibly not know this???
@chrisofnottingham
8 жыл бұрын
I have some sympathy with people who get this wrong by arguing that gravity pulls more on the heavy ball, because it really does. The problem is that people don't really have a good intuition for inertia. We have all tried lifting heavy objects, but the thing that limits us tends to be the force due to gravity rather than the inertia. The best way to get a feel for inertia is by sliding objects of large mass on low friction surfaces, but that is a somewhat contrived situation compared to lifting the shopping out the back of the car.
@Ekitchi0
8 жыл бұрын
Rolling heavy objects works as well, like pushing your empty cart vs your full cart when shopping. The heavy cart is both harder to get going and harder to stop.
@chrisofnottingham
8 жыл бұрын
Ekitchi Hoshi Exactly. But for some reason people just think of the weight of an object and forget about inertia.
@NickoGibson
7 жыл бұрын
I've noticed that skating with a really heavy backpack makes it go a bit faster in the downhills. It's crazy. And also the falls are faster and harder.
@Ekitchi0
7 жыл бұрын
Nicko G. Yes you go faster downhills on a skateboard with a heavier weight, but that is because of friction. Without friction, you would go just as fast no matter the weight. With larger masses, you get a greater weight and a greater inertia but the same friction. Friction counters a smaller percentage of the weight for heavy objects than light objects. For the same reason the feather and roc fall at different speed when there is the friction due to air, and at the same speed in a vacuum.
@chinareds54
7 жыл бұрын
Skating downhill is a completely different situation. You're not in freefall, so what's actually happening is the force due to gravity is being converted to rotational velocity for the wheels. It's a more complicated equation where the mass doesn't cancel out.
@jerryjamify
7 жыл бұрын
Depending on how high you drop it from the heavier ball would land first because of velocity. The lighter ball would be affected more by the air resistance.
@minetubequest
2 жыл бұрын
nope Derek didnt mean this in his video.
@rubenkeller5543
Жыл бұрын
thanks, thats relevant to know. because the air resistence is the same amount for both objects, as they are equally big/ same shape, but you are saying that the opposing vorce of the air resistance has to be calculated proportonally to the other two forces, gravity and inertia. now i get it
@pablogriswold421
8 жыл бұрын
I love the old dude who assumed Derek was using magic!
@emperorpingusmathchannel5365
6 жыл бұрын
2:00 I was afraid the ball was going to flatten Derek
@AMKADID
7 жыл бұрын
The acceleration due to gravity near the surface of earth has a value of 10 m/s² (approximately). It is same for all the objects, falling under the action of gravity.
@faceless1434
4 жыл бұрын
Not quite, to my understand gravitational field strength (g measured in N kg^-1 which is actually the same as m s^-2) is the same for all objects however the acceleration is not. F=ma only applies to the resultant force and because of air resistance (which this video doesn't consider) the resultant force =/= weight. If there was no atmosphere then F=ma=mg => a=g however it's more complex than that and to really really over simplify it F=ma=(mg-A) => a=g-A/m where A is the force due to air resistance. Sorry about how this is an old comment and stuff and my answer is probably very wordy.
@Prometheus42
9 жыл бұрын
thats like saying a feather and a nickel would hit the ground at the same time. they wont. you need a vacuum
@willoughbykrenzteinburg
9 жыл бұрын
That's the entire point. This video is about GRAVITY - - not drag, so drag is being ignored, and in that case, a feather and a nickel will indeed hit the ground at the same time - something you acknowledge to be the case.
@ck1416
9 жыл бұрын
i think if the height is large enough, the slight difference btw the net force will show. Weight of the larger mass is larger. Net force = weight - drag (air resistance) since there is difference in weight and we assume both have same drag due to same shape and size (discounting other factors), there will be slight difference in net force, which will be apparent when both objects are dropped from high enough.
@avochristos7834
9 жыл бұрын
Willoughby Krenzteinburg I have a question that has been bugging me for a while. What if the moon fell to earth, Idk the gravitational acceleration of the moon but lets assume that it is 3m/s2. How fast is it's acceleration towards earth? will it be 13m/s2 or what.
@willoughbykrenzteinburg
9 жыл бұрын
Avo Christos the accelerarion of the moon toward the Earth would be the same as any other object from the same height. The Earth would also noticeably accelerate toward the moon, but those accelerations are independent of one another. You don't add them together.
@pitdarkangel2961
9 жыл бұрын
Based Vsauce well the feather is kinda pulled everywhere by wind
@balancedfloww
7 жыл бұрын
I am currently taking my first classical physics course on mechanics in college and I never really tried to understand the concept of inertia. I learned something by watching this :) I thought I knew the basic idea of this stuff already but I had ust lied to myself.
@aaron9828
8 жыл бұрын
Actually, the heavy ball will fall faster because it has the same area and the same air resistance as the basketball. This effect just doesn't show up for such a small height.
@asyrafebo4609
8 жыл бұрын
lol, lots of physicist testes it by going it to a rollercoster and still they fall at the same speed. don't follow your own desire.
@asyrafebo4609
8 жыл бұрын
lol, lots of physicist tested it by going it to a rollercoster and still they fall at the same speed. don't follow your own desire.
@aaron9828
8 жыл бұрын
It'll still fall a little bit faster, unless you do it in a vacuum.
@svetovid5897
8 жыл бұрын
the problem here is, that since neither ball was pushed, they were just dropped, none of them had initial speed, and their terminal speed will be v = g*t where t is time of the fall before hitting the ground, and g is the acceleration due to the gravity, which is a constant, which means it's always the same, no matter what, as long as you are on earth. Therefore, speed of two objects falling from same height is in no way influenced by either their shape, size, weight nor color. It is what it is.
@KaitouKaiju
7 жыл бұрын
A vacuum shouldn't matter if the objects are the same size and shape. They fall at the same speed because inertia scales with mass at the same rate that gravitational force does.
@theminecraftwikiman
Жыл бұрын
The thing that never gets talked about with these examples is that acceleration is the same for all objects in a gravitational field, but terminal velocity does depend on mass
@fromnorway643
Жыл бұрын
Mass alone doesn't determine an object's terminal velocity. It's the air resistance per unit of mass that matters, and that can be quite different for objects with the same mass if they have very different densities or shapes.
@MaxArceus
9 жыл бұрын
I'm seriously wondering how these people got through highschool...
@andreaberetta9656
4 жыл бұрын
Depends on how good your professor is at making the subject interesting, I hate physics due to some really old school teachers , although I’m starting to find it kinda interesting since I started looking into it on my own for some exams
@MaxArceus
4 жыл бұрын
@@andreaberetta9656 Whether you like it or not, you'd still have to pass the class
@andreaberetta9656
4 жыл бұрын
@@MaxArceus what i'm saying is that you'll study for the class and forget everything as soon as it's over
@MaxArceus
4 жыл бұрын
@@andreaberetta9656 Sorry, but that's kinda stupid. Even if it doesn't interest you much, there's a reason you're being taught those things. Why'd you just go forget it? And sure, you can forget some things, human minds are not infallible, but something as basic, and important as this? Given you're subject to the laws of gravity literally 24/7. It's not like he's asking for the formula to calculate how long the fall will take.
@blackburn3r
4 жыл бұрын
@@MaxArceus because that's how people are. Do you honestly think you'll remember every thing If you don't ever use that info for years. I can't properly remember things I've studied this year. And I really do try to learn them. And saying how you can forget details about something you constantly are aware of. What does your nose smell like? Do you think it dosen't have a smell? No it does but your brain just *forgets* it's good at ignoring repetitive information. It took so much time for humanity to even question why things always go down. We forget things because they are always there.
@lukie7691
7 жыл бұрын
This is almost always true, unless you are dropping from a much higher height (lets say enough to have terminal velocity). The basketball will reach terminal velocity, much sooner than the medicine ball, so the medicine ball will hit first in that case.
@numbblackpicture
3 жыл бұрын
The animation at the end where the ball squishes the car is completely unneccesary, I love it. Doing extra, even if you don't have to. You know who does that? Great people.
@Fish_InChips
9 жыл бұрын
What if both objects reach terminal velocity. The heavier one should be falling faster at that point right?
@SideStrafed
9 жыл бұрын
No, regardless of terminal Velocity, both objects will hit the ground at the same time
@carultch
9 жыл бұрын
+PolyvinyLs Not true. Terminal velocity is a function of mass, shape, area, and density of surrounding air. It is only when air drag is negligible, that both objects hit the ground at the same time.
@Etropalker
9 жыл бұрын
+Fischer Hill If you measure accurately enough you would probably see the difference before they do that.
@CountArtha
7 жыл бұрын
Yes. The medicine ball actually does fall that little bit faster because it's heavier, but that's not because of gravity. It's because the air slows the basketball down more than it slows the medicine ball down. If there was no air, they really would fall at exactly the same speed.
@HiHi-tn8sf
6 жыл бұрын
If they reach terminal velocity the heavier one will fall down first because it reached terminal velocity a bit later than the lighter one. Galileo stated this on his reflection of the leaning tower of pisa expirinent
@megabuster3940
9 жыл бұрын
Divide gravitational force by mass and you get gravitational acceleration. Or F/m=a ... (Fullmetal Alchemist?)
@10Vsauce
9 жыл бұрын
Liked your comment just because of the fma part
@funkytom7709
7 жыл бұрын
Don't forget that this equation only work if the mass m is constant ... (It's the principle of equivalence in Fullmetal Alchemist !!!)
@UmhelloIexist
3 жыл бұрын
That's actually a good way to remember it :)
@joubaur
11 жыл бұрын
At this point, I'm just going to subscribe. Don't know when I'll find the time to watch, but these are great! Good job.
@lachazaroony
4 жыл бұрын
I was shocked how many people you asked didnt know two objects of different mass hit at the same time. At least here in Canada thats like the first experiment they teach you in science class.
@renedekker9806
Жыл бұрын
I was surprised about that as well (I'm from Europe).
@王磊-y5j
Жыл бұрын
china+1
@PAIN166
8 жыл бұрын
Of course acceleration is the same for everything on earth, but only in vacuum. With resistance from air, I guess the light ball is slowed down at a higher rate than the heavy ball, therefore the heavy ball should hit the ground slighly earlier. Am I right?
@simonenoli4418
8 жыл бұрын
yeah termvel is slightly higher for denser object with similar aerodynamic features
@arandombard1197
6 жыл бұрын
The heavier object also pulls the earth or moon to it faster so technically heavier objects do fall faster, even in a vacuum.
@sigmaoctantis_nz
8 жыл бұрын
This needs to be expanded on in terms of terminal velocity. The medicine ball and basketball only fall at the same rate over a short distance, eventually the medicine ball will reach a higher terminal velocity because it has more inertia capable of countering roughly the same amount of drag as a basketball. As speed picks up, acceleration decreases for both balls but the medicine ball will reduce in acceleration at a slower rate.
@MrCmon113
8 жыл бұрын
+Sigma Octantis That's about air resistance. The air accelerates the heaver ball less upwards than the lighter one. I think air resistance and friction are a few of the main obstacles in understanding mechanics, so it's fair to discuss the whole thing without them at first.
@xFlRSTx
8 жыл бұрын
+Taxtro but he should have at least told people to ignore that, otherwise people will think they get it and then later realize that a balloon doesn't do what they thought this guy said it should and they stop believing it.
@LUVROCK5800
8 жыл бұрын
didn't we all learn in grade school that Galileo already proved this?
@quentinbeck7828
6 жыл бұрын
no
@PackerBronco
4 жыл бұрын
Galileo didn't prove this, he observed this and postulated this. If anyone could be said to have proved it, it would be Albert.
@devnampriyapriyadarshi1331
4 жыл бұрын
@@PackerBronco No, its Newton. F= m a and F= G M m /r^2 so the small 'm's cancel out on equating the two forces and give us a constant value for acceleration a = G M / r^2 which is nearly equal to 9.8 m per second squared.
@PackerBronco
4 жыл бұрын
@@devnampriyapriyadarshi1331 Yes but that assumes that the "m" in Newton's 2nd Law is equal to the "m" in Newton's Law of Gravity. In other words that inertial mass is the same as gravitational mass. Newton assumed it to be true and used that assumption to derive the fundamentals of orbital mechanics. Einstein took that assumption one step further with General Relativity's restatement of the Equivalence Principle.
@hybmnzz2658
4 жыл бұрын
@@PackerBronco really just semantics. You don't "prove" anything in science you just observe it and follow the scientific method. We are victims to the unreasonable effectiveness of mathematics.
@brianwagner8424
11 жыл бұрын
This video is fantastic! If you don't mind me asking, what software did you use to do the 3D balls and the car being crushed? I've done similar visual effects with Element 3D in After Effects, but nothing that advanced. I'd love to know!
@spuddo123
Жыл бұрын
Technically the medicine ball IS accelerated toward the Earth more quickly, but the difference is infinitesimally small. Think about two basketballs in deep space, they are attracted to one another albeit at a minuscule acceleration. Now replace one basketball with a planet, and the acceleration increases to macroscopic levels. It's the total difference in mass that makes a difference, and because the difference in mass between basketball + Earth and medicine ball + Earth is so small relative to Earths mass it makes no difference realistically.
@lolatomroflsinnlos
11 ай бұрын
The force depends on the product of the masses, not the sum. If the medicine ball is 10 times as massive, the gravitational force will be 10 times greater. The acceleration a = F/m will be the same for both because the mass cancels out.
@Jack-ne8vm
9 жыл бұрын
Imagine a bag of sand falling- a collection of grains. All together, they fall at the same speed. Each light grain falls at the same rate as the whole big bag full. The bag could be as heavy as an anvil, but each light grain falls as fast as an anvil.
@PinkeySuavo
Жыл бұрын
This example does not speak to me. They fall together because they are connected. If u delete the bag they could fall at different rate because of different air resistances.
@NeroSchwarz0
10 жыл бұрын
You lie! Acceleration is not the same for both objects. F1=M1*g-F_air_resistance F2=M2*g-F_air_resistance a1=(M1*g-F_air_resistance)/M1 a2=(M2*g-F_air_resistance)/M2 a1-a2=(g-F_air_resistance/M1) - (g-F_air_resistance/M2) = F_air_resistance/M2 - F_air_resistance/M1 If M2>M1 => M2 hits the ground first
@mlucasl
10 жыл бұрын
THAT... but resistance is futile... well at least at this scale, and measuring with a human eye..
@BorisBlade7
8 жыл бұрын
I've heard the fact that they fall at the same rate explained a hundred times and its basic knowledge at this point. But this is the FIRST TIME someone has actually explained why by including inertia which causes the idea to make perfect sense that even a kid could understand. This is what aggravates me about most education methods. Simple explanations like this cause the idea to make sense and be remembered by far more people than one that feels more like "I know it doesnt make much sense, but just trust me, its true" which is what you get most of the time.
@jfutach
9 жыл бұрын
This is so wrong on a fundamental level! It's true what they say for free falling in VACUUM. The only reason the heavier ball doesn't fall faster here is because of the small height from which both balls are dropped. If it were much higher, the basketball would reach terminal velocity sooner and the heavier ball would keep accelerating and fall faster.
@willoughbykrenzteinburg
9 жыл бұрын
Actually, it's RIGHT on a fundamental level. That _fundamental_ being how gravity affects falling objects - which is what this video is about. This video is not about how drag affects falling bodies. Drag is being ignored because they are talking about fundamental gravitation. In real world applications (orbital mechanics, etc.), there is no drag to worry about anyway - and since Veritasium does not have access to a vacuum chamber, an imagination will have to do. You have one of those, right?
@jfutach
9 жыл бұрын
Willoughby Krenzteinburg By trying to clear a misconception, you are creating an even bigger one so it's not OK. There are actually many people who do not understand that IN AIR HEAVIER THINGS FALL FASTER, and it seems to me that it's possible that this kind of teaching physics lead them to that.
@willoughbykrenzteinburg
9 жыл бұрын
Leeroy Kincaid Actually, the opposite is more often the case. People have misconceptions about gravity because of drag. It's a process. You cannot possibly understand how drag affects a falling object without first being taught how gravity ALONE affects it. In fact, if I asked you to tell me EXACTLY how a falling object behaves in an atmosphere, I challenge you to explain that to me without first analyzing how gravity alone would affect it (HINT : you can't do it). Again, it's a process, and learning fundamental gravitation is step one. This video addresses step one. There are many other sources that get into more details. This is not one of them. Sample question for you : Suppose I drop a 1 kg object from 10 meters above the surface of the Earth, and it takes that object exactly 1.75 seconds to reach the ground. What was the average force of drag acting on that object? Answer this question, and explain the answer to me WITHOUT addressing how gravity alone would have affected that falling object. Go.
@jfutach
9 жыл бұрын
Willoughby Krenzteinburg Of course you need to know basics first, but watch the video again - the guy acts smart and asks people which ball will fall first. He DOES NOT point out - in VACUUM!!! Therefore his answer that they fall at the same time IS WRONG, ecpecially since he afterwards lets them fall and claims they fall at the same time (which they do not, but because of the small height and imprecise measuring it seems they do). This video is absolutely catastrophic from an educational point of view and makes more mess and misconceptions than the one it was originally meant to clear... I'm sorry because you're trying and clearly have good intentions, but this is not good teaching.
@willoughbykrenzteinburg
9 жыл бұрын
Leeroy Kincaid You are really over analyzing the situation. This is how gravity is taught all the time. Perhaps you missed that day or something. As far as I am aware, they do not have vacuum chambers in classrooms across the world in which to do these demonstrations, so - like I said - some imagination is required. In this particular demonstration, it is not necessary to point out that we are ignoring drag because it is negligible. In fact, as you correctly point out, the fact that they might not have been dropped at the same exact time has just as much an impact on the outcome, but obviously it is ASSUMED that they are. It is also assumed that the ground where they land is reasonably level and even - and again - this probably isn't the case in reality. In fact, if you were a real uselessly anal person (it seems you are in fact this), you would point out the fact that the Earth itself is attracted more toward the more massive ball, therefore accelerates more toward it. However, the vast majority of logically thinking and reasonable people will assume that all of these negligible peripherals are being ignored. Again - apparently, you are not a logically thinking and reasonable person because you keep mentioning drag. I will quote only your very first sentence : "Of course you need to know basics first" This is correct. That's what this video is doing. If you can't get over the fact that it doesn't mention drag or account for it, then my response to that would simply be : YOU ARE NOT THE TARGET AUDIENCE OF THIS VIDEO. And all this being said, lastly but certainly not least of all : It is a KZitem video; you are not owed anything. If you can watch this video and claim that it is "catastrophic" educationally, then you have not watched very many KZitem videos. I'm done. Have a good one.
@imadecoy.
8 жыл бұрын
The heavier ball will always hit the ground first, but it may not be perceivable or measurable. When it comes to situations where the gravitational force of one object is exponentially larger than another, (planet vs basketball) the mass of the smaller object is usually not considered in the measurement of gravitational force. This is why we tend to say that gravity is a constant 9.81 m/s^2 for all objects near earth. However, in reality the gravitational force of any object will also act on the earth causing a slightly higher gravitational acceleration.
@xFlRSTx
8 жыл бұрын
+something1random23 but if the experiment is to drop both objects at the same time then the acceleration of the earth towards the objects will be the same for both ;)
@imadecoy.
8 жыл бұрын
firsy However, you can't drop the objects and have them occupy the same space. This means the acceleration of the earth will be angled more toward the heavier ball.
@willoughbykrenzteinburg
8 жыл бұрын
something1random23 A bear shitting in Wyoming will have just as much (and just as insignificant) of an effect.
@imadecoy.
8 жыл бұрын
Willoughby Krenzteinburg I never said the difference was significant. I said the opposite in fact. This is all a hypothetical situation where nothing else is having a gravitational effect on earth as well as no air resistance, though air resistance could make the results considerably different depending on altitude.
@willoughbykrenzteinburg
8 жыл бұрын
something1random23 I see. A better mind experiment then would be dropping two balls from the same distance from the Earth's center, but on opposite sides of the Earth. Then the Earth would have a net acceleration toward the more massive ball. It is still important to point out that the acceleration of the balls themselves has not changed. In your original comment, you implied that you attributed the Earth's independent acceleration to the balls' when you say the gravitational acceleration would be greater on more massive balls and not necessarily a constant 9.81 m/s². Two ways this is misleading. 1) 9.81 m/s² is in no way a constant. It is variable. This just happens to be the gravitational acceleration for objects at sea level on Earth. If you are below or above sea level, it is slightly lower or higher. It is about 9 m/s² for astronauts in orbit. There is a constant G-force (a unit of acceleration) which is based on the acceleration due to gravity at sea level, but the gravitational acceleration itself is not a constant. 2) two object that are the exact same distance from the Earth will have the same acceleration due to gravity - no matter their difference in mass. Any acceleration of the Earth is independent of that.
@hisoka44444444
5 жыл бұрын
looking at this 7 years later, you see how much has changed in production
@soykankamal4248
8 жыл бұрын
this is a 8th grade physics subject in turkey
@Vezerate
8 жыл бұрын
+Özcan Yılmaz Pretty sure it is everywhere. I don't get how they couldn't have known this.
@soykankamal4248
8 жыл бұрын
yeah dude everytime i see videos like this i think of that
@Vezerate
8 жыл бұрын
+Özcan Yılmaz Me too. Some of the subjects are very trival, however I still love his videos and the majority is still mind-blowing and much more complicated.
@baab4229
8 жыл бұрын
+Victor Brink Wos they ask many people and only 1% of them don't know it, so they show only those who don't know it.
@vardenispavardenis9428
8 жыл бұрын
+Özcan Yılmaz Its actually one of the first things you learn in physics class
@XxKINGatLIFExX
10 жыл бұрын
Someone give this guy a TV show
@maxwellmulford5898
6 жыл бұрын
Yes the acceleration due to gravity is equal, but air resistance is also equal and affects the medicine ball less. Therefore, the medicine ball does fall slightly faster. That difference would be more exaggerated if the drop height were higher.
@Peter_1986
6 жыл бұрын
Yes exactly, thank you for acknowledging the existence of air resistance.
@nathanwood5481
9 жыл бұрын
You just love your inertia, don't you.
@carultch
9 жыл бұрын
Nathan Wood You spin me right round, baby, right round. In a manner depriving me of an inertial reference frame, baby, right round.
@lennywendigo5725
8 жыл бұрын
"I am surrounded by bakas!"
@federicogonzalez8033
9 жыл бұрын
Technically, the medicine ball will fall faster, but in this scenario the acceleration difference is neglible. While gravity is applying the same acceleration to both objects, the medicine ball will have a higher force, and because both objects are aerodynamically the same they will get the same friction from the air, and the friction will have a bigger effect on the basketball.
@xferociousx
8 жыл бұрын
+Federico Gonzalez Would not the more massive object have more resistance to the change in inertia, thus canceling out or equalizing the effects of the added force over the less massive object?
@federicogonzalez8033
8 жыл бұрын
xferociousx yes it will have more resistance due to inertia, that's why it requires more force. But the air resistance will be equal in both objects, and because the heavier object has more force, the change in net force due to friction will be relatively less making it accelerate (very slightly) faster.
@seb001977
11 жыл бұрын
It's amaizing how many people skipped physics lessons in school.
@IronGolem2009
8 жыл бұрын
Two words... Air. Resistance.
@petrkalina2032
3 жыл бұрын
The balls are almost the same shape ( and size) so that doesn't have much of an impact in this experiment. It would however change the result if the balls were allowed to reach higher speeds (terminal velocity of the basketball is lower because of your favorite Air resistance).
@RavnoUK
10 жыл бұрын
who would ever imagine that people out there still not knowing this....
@gameisfun2815
6 жыл бұрын
RavnoUK I think they are acting to show themself stupid because it make more our mind work with some ideas which make easy to understand and more memorable.
@dannybo6907
10 жыл бұрын
But he says nothing about air resistance which is a big key in what he's talking about
@rashkavar
9 жыл бұрын
It's slightly disturbing that they were able to find that many people, so easily, who are unfamiliar with this fact. Whether you arrive at it through an understanding of Newtonian Laws, Relativity, the results of Galileo's classic experiment (which they;re recreating word for word), or even just personal experience playing ball as kids...people SHOULD know this.
@desromic
9 жыл бұрын
"I need to read more books." BINGO!
@ron9269
3 жыл бұрын
Ding - ding - ding - ding - ding
@Obbliteration
10 жыл бұрын
Dude, if you do this kind of science divulgation videos you shouldnt divulge false information. The terminal speed of heavier objects is higher than from lighter objects. So both object will fall at the same time if the lighter hasnt reached terminal velocity. So heavier objects fall faster if you give them enough space.
@deadnoobie2859
10 жыл бұрын
Terminal velocity only hits in sufficient distances and is different depending on atmosphere. For all intents and purposes, what he said IS correct as far as the average person is concerned. Sure you could go on about terminal velocities, distances traveled, what kind of drag is in place, curvature the space it's traveling through, shape of the objects and the resistance the shape gives, etc etc, then it might as well be a video long enough to explain the entirety of a physics course. This isn't necessary. I mean, if you want to get technical, if you were falling with the two spheres, and there was no other reference point to go by, there would be no way to tell if you or the spheres were moving at all. None of this is necessary for this video explaining a simple principle that holds true for every day life.
@RaimarLunardi
10 жыл бұрын
In vaccum there is no terminal velocity for falling objects... for educational purpose he left aside air/fluid dynamics
@ominouspenguin
10 жыл бұрын
***** Most people call it a vacuum.
@Obbliteration
10 жыл бұрын
Raimar Lunardi So practicall... we live in vacuum...
@BigDBrian
10 жыл бұрын
Terminal velocity is when the pull of gravity and the air resistance are equal. The heavier ball will always hit the ground slightly faster in air due to the simple fact that the amount of air resistance affecting the balls is equal, but has a lesser effect on the heavier ball because of the higher inertia.
@glaucoeltink5973
7 жыл бұрын
Its curious, because, if you drop one steel ball and another aluminium ball, with the same size and shape, they will fall together, because: m*a = F = P = m*g => a=g But suposing you could make a ball of something suficiently light, you will have to considerate the aerodynamic drag, coming up with: (rho is the density of air, C is the aerodynamic coefficient, A is the frontal area and V is its velocity) F - F(air) = m*a m*g - (rho)*C*A*V^2 = m*a a = g - [(rho)*C*A*V^2]/m That means that if m is sufficiently low (or sufficiently different, if you are comparing things), you can't say that they will fall at the same time: a heavy ball and a lightweight one may not reach the ground at the same time, even with the same size and shape! And we are not considering the buoyancy in the air: thing if you could make a ball of helium and try to drop it!
@kacper8562
8 жыл бұрын
"Everythinf accelerates at same rate and falls at same time" That is if none of those objects reach terminal velocity. Heavy object's terminal velocity is higher, therefore if we'd drop balls from 1 km up, heavy one would fall faster due to weight of ball. Light basketball would be more affected by drag, and therefore stay above heavy ball during the fall.
@blakesnipe5347
8 жыл бұрын
drag is being ignored here
@kacper8562
8 жыл бұрын
i know. That's because of small speeds.
@blakesnipe5347
8 жыл бұрын
Kacper Szczerbiak Not necessarily the small speeds. You could consider drag and then deem it negligible for real calculations due to the small speed. Drag is being entirely ignored because it is the reason that there are misconceptions about gravity in the first place. Drag is always ignored when talking about how gravity and gravity alone affects falling bodies.
@kacper8562
8 жыл бұрын
i see what you mean, and yet the phisics won't ignore drag. and it's not like those balls were dropped in vaccum. drag was obviously here, but due to small speeds it was just irrelevant. however i get that you're trying to say that drag wasnt even counted in.
@blakesnipe5347
8 жыл бұрын
Kacper Szczerbiak Physics DOES ignore drag when it is teaching fundamental gravity. Otherwise, it can't teach it.
@IRSmeger
10 жыл бұрын
they only land at the same time in a vacuum otherwise it depends on the drag coefficient if the drag coefficient is the same the heavier object will hit the ground first
@lukelayton4506
4 жыл бұрын
My teacher gave us this vid to watch and I’ll never see her as boring again cuz this is my fav channel
@wolffgang101
7 жыл бұрын
You can hear his Aussie accent kind of come out at times
@theFox25games
7 жыл бұрын
I was actually mad at my physics teacher today when he asked us a smilar question and when I said the balls hit the ground at the same time due to inertia and he said i was wrong...
@gerardo49078
3 жыл бұрын
What was his reply though?
@kdreamer007
4 жыл бұрын
We don't have to assume no air resistance because the surface area of both the balls is almost equal therefore the air resistance faced by them will also be equal. You're relating it to the feathers and ball experiment but in that case the resistance faced by the feathers is more because they have more surface area.
@fromnorway643
4 жыл бұрын
Yes, but the black ball has 8 times more mass than the basketball, so when both are dropped at the same time and accelerates downward, the basketball will approach its terminal velocity (when acceleration stops because air resistance equals gravity) sooner than the black ball and will thus start lagging behind. We didn't see that here because none of the balls reached a high enough speed for the air resistance to become important, but the difference would be obvious if they were dropped from much higher up.
@kdreamer007
4 жыл бұрын
@@fromnorway643 ya,we didn't see that because here the height wasn't so much.....my knowledge about gravity is still less since I haven't learnt about it much ....I get confused sometimes.
@ggaOnLinux2008
9 жыл бұрын
missing these videos about physics...
@Jipzorowns
10 жыл бұрын
again, common knowledge is not so common
@willleslie2745
5 ай бұрын
NEW INFORMATION SAYS THIS IS ACTUALLY NOT TRUE. At least to the exact measurments. Due to the fact that the bass has mass = it has its own gravity therefore on the sub-sub-sub atomic level, the earth is actually being pulled towards it. Therefore it is hitting the ground ever so slightly faster. Not to mention air resistance and general terminal velosity.
@12315yh
10 жыл бұрын
every child in china know this
@bkekria1
10 жыл бұрын
knows* ...
@spaceface105
10 жыл бұрын
*period
@apollo345minecraft2
10 жыл бұрын
Every child in most places know this
@kirkey99
10 жыл бұрын
"every child in china know this" They better! I don't want my nikes glued together by some ignoramuses!
@0Cindrum0
7 жыл бұрын
+crikey mate oh man someone direct Mr. Yang to the nearest burn ward
@SquareIsNotCool
8 жыл бұрын
Im 13 and i know the answer
@hughmongusfungusamongus2439
8 жыл бұрын
This comment is useless.
@SquareIsNotCool
8 жыл бұрын
Some Guy k
@cubescubescubescaptain3708
8 жыл бұрын
Im 13 too, but I knew the answer when I was 11
@4CiiD3
8 жыл бұрын
and you think you're special
@SquareIsNotCool
8 жыл бұрын
Kormarg no ;3;
@z1k1c1321
6 жыл бұрын
Every nerd who knew the answer was waiting for that glorious nerd show up and present our holy kind at its best. Thank you mate...
@AFpaleoCon
9 жыл бұрын
I actually thought he was about to blow all our minds. I thought it was common knowledge things fall at the same rate if you're not talking about vastly different air resistances. I thought he was going to actually be like nope they don't but I guess people still don't understand this idea.
@fighterguard
8 жыл бұрын
I love that you used vallenato during the drop sequences :D
@DavidMartinez-qe1qm
3 жыл бұрын
I heard that and I thought "nahh can't be vallenato" but I'm glad someone else noticed!
@agerven
4 жыл бұрын
Very very nice way of demonstrating this while not going to the moon! Kudos for that. Real good video! Compliments and thanks
@johnakitto
10 жыл бұрын
I find it more convincing when you realize that the Universe doesn't know what you're deciding to call the "object". For example, if you took two Legos and hooked them together, it would make no sense for that two-block system to fall any faster than two individual one-block systems dropped 1mm from each other. It ultimately doesn't matter that the two blocks are touching; all atoms just fall at the same speed, and if others are along for the ride, great. The same goes for the medicine ball. If you cut the medicine ball in two pieces, there would be no reason for the two pieces to suddenly fall slower than the original, heavier medicine ball.
@tn9711
10 жыл бұрын
A 3 minute video explains it better than books worth of hours of knowledge.
@snipernote
10 жыл бұрын
I thought about it and I want to say that this is true as long as the basketball speed doesnt hit that ultimate speed when its no longer accelerate because of air drag and friction So the ultimate answer is no ... heavy ball will always win if you put it in real life falling from sky because it can fight and beat much greater air friction/drag while its falling ! Hope this impress you
@mutalibgozalov7208
4 жыл бұрын
the key is that we think more force is means faster but this is for objects that have same mass, when masses different then more force doesn't mean the object will always move faster you have to take the mass to account. So more force tends the objects move faster but at the same time more mass makes movement harder.
@marius100mark
7 жыл бұрын
To all the people commenting about terminal velocity, he asked which of the balls would hit the ground first from the given height, from which clearly none of the balls would hit their terminal velocity. +Laurelindo +Austin Moser +Dad S +0YouCanCallMeAl0 +PracticalAl ! +Obbliteration +Fischer Hill +Aaron J
@TheDibash
8 жыл бұрын
Correct me if I'm wrong, Theoretically the black ball is supposed to fall "A Very Slightly" faster than basketball because it has more air resistance due to its mass. I'm saying this on the reference of of Galileo's experiment of falling bodies.
@chuckbatson595
Жыл бұрын
It's fun and instructive to compute the velocity of an object when it hits the ground (discounting air, of course) by equating gravitational potential energy to kinetic energy as in mgh = 1/2 mv^2. Immediately the two "m" terms cancel and what's left has no dependence on mass.
@nerdexproject
7 жыл бұрын
I knew the answer but I was glad to hear the theory behind it! Sometimes you know how stuff is, but not really why!
@nicholasaw1180
7 жыл бұрын
To summarise, both objects did not attain terminal velocity, thus they seemingly fall at the same rate. Air resistance is negligible within limits of this experiment, hence the aforementioned result is observed. Side note: inertia is not applicable in the explanation of falling objects with different mass.
@RamesGamesLC
6 жыл бұрын
Idk why the awesome editing done in this video is no longer used :( So good
@chocolate_squiggle
3 жыл бұрын
Read the description - this segment was for a TV programme in Australia. They probably handled the editing themselves.
@AndrewSlacks
3 жыл бұрын
Technically most of these people are correct, but for the wrong reason. The lighter ball has a lower mass-to-surface area ratio and is thus more affected by air resistance than the more dense ball. The difference would be virtually imperceptible on the scale of this experiment, but would be evident if both balls were dropped from, say, 1000 meters. Great video, physics rocks.
@mr.chaoticgood1469
5 жыл бұрын
Thank you Dr. Derek. I have watched your videos for the past 4 years. I was always stumped as to why they would land at the same time, when one object has a greater force of gravity. That being said I knew how they would behave, but not why. Now I know why, even in areas with air resistance they land at the same time.... Inertia is a property of matter
@willoughbykrenzteinburg
4 жыл бұрын
They would not necessarily land at the same time in areas with air resistance.
@fromnorway643
4 жыл бұрын
The balls landed at the same time despite air resistance because they didn't reach a high enough speed for the air resistance to become a significant factor. If dropped from a larger height, the medicine ball would land first.
@ayonmukherjee5539
7 жыл бұрын
I would like to venture an alternate explanation. A greater gravitational force on the black ball is the result of its greater mass, which results in it having a greater momentum, w.r.t. the orange ball, due to its mass. The rate of change of velocity, i.e., acceleration, of the balls doesn't depend on their masses, but on the mass of the object pulling them (the earth) and the distance from that object's centre (which, in this case, will be the earth's radius added to the equal height of both balls above the ground). As these quantities do not change, the balls have an equal acceleration, called the acceleration due to gravity. Great video, anyway! Thank you!
@holomurphy22
2 жыл бұрын
Adding the extra height above the ground to the earth radius doesnt make much sense. Earth isn't spherical
@kalyanighuge7862
4 жыл бұрын
This helped me understand the first concept in physics. Can you do more interesting experiments for normal college physics concepts?
@willoughbykrenzteinburg
11 жыл бұрын
And in a physics text book, when gravitation is first introduced, not only does it ignore drag; it gives no disclaimers saying that drag is being ignored. The point is, this video is intended for those who do not understand fundamental gravitation. A disclaimer regarding the ommission of drag is not required because the author assumes the intended viewer is not aware of drag yet. Including drag or giving a disclaimer about the ommission of drag is sure to confuse the intended audience.
@crhasty12
11 жыл бұрын
I appreciate the advice! I've been trying to force myself to appreciate the beauty of mathematics - and it's exactly things like that that I am trying. Recently learned that the mass/weight at the end of a pendulum doesn't effect the speed of it's period of oscillation 0.o . Cheers!
@JackMott
11 ай бұрын
You are ahead of Socrates
@Gummif
11 жыл бұрын
Using Newton, the acceleration of the balls is according to ma = F = gravity (mg) + drag + buoyancy (+other insignificant forces as magnetic or radiation). If one ball were filled with helium, say, then buoyancy might overcome gravity. And if the speed of the balls becomes large, drag approaches other forces in magnitude.
@justyourfriendlyneighborho903
Жыл бұрын
I already knew that objects fall at the same rate if air resistance isn't a factor but this is a really interesting explanation, I thought I understood why it happened but I didn't
@JD-ub5ic
7 жыл бұрын
To all of you who are saying "everyone knows this, mass is irrelevant" you have misunderstood the video completely. Mass as a measure of inertia was a key point of this video. This video presented acceleration as the ratio between the force on an object and that objects resistance to acceleration, inertia (or symbollically, F/m = a). If mass didn't matter, say if a greater force were applied to two different masses different accelerations would occur (change f at a constant m and a changes) and the balls would hit at different times. Its because the mass is there that the increase or decrease in force is balanced in such a way that the acceleration is then constant, so yes, mass does matter (again, remember mass is a measure of inertia). 1:40 "the weight (she meant inertia/mass) holds it back in a way..." (thus counteracting the increase in force).
@noahdantonio4779
8 жыл бұрын
Actually, depending on what reference frame you use, the heavier object will fall a tiny bit faster, although the difference is negligable. That's because in the reference frame of the earth, the ball is pulling up on the earth with the same force. The Earth is huge so the difference in the acceleration of the earth is minute, but it is there. They've done experiments on this and confirmed this.
@simonenoli4418
8 жыл бұрын
if the frame is earth surface then pulling the frame upwards help the medbal as well as the Bball. to calculate the pull exerted on the system earth you would have to consider both balls as a sole entity.
@JohnnyDoeDoeDoe
8 жыл бұрын
This is not true, you have to consider the *acceleration*, not just the force, to predict motion. In this case, a=F/m, and is practically constant and the same for both balls/ Air resistance and a non-constant gravitational field would change this, however these are negligible for in scenarios with a short fall near the Earth's surface
@JohnnyDoeDoeDoe
8 жыл бұрын
Noah D Ah, I completely forgot to consider the heavier object's own gravity. Very good point, I stand corrected Your calculation makes sense and I'm browsing the Stack Exchange link to read a bit more. Practicing physics at a basic level, I never thought to take into account the force an object exerts on a comparably enormous planet As you calculated, it does make a minute difference, but this goes a long way in improving my understanding of physics. Thanks!
@fair1831
5 жыл бұрын
Hi, You say, "They've done experiments on this and confirmed it." I am interested in this because I had also considered the gravity of the falling object (inertia not forgotten). If these are so, please can you point me to where I can find out about such experiments.
@YostPeter
7 жыл бұрын
I hope one day Derek asks me physics trick-questions on the street. I will be _so_ ready.
@ForeverLHR
2 жыл бұрын
It is just amazing. Every single video you do is just awesome and so useful!!!! Great.
@FlyingByDave
11 жыл бұрын
After giving a bit of thought to mstdesigns comment about not dropping them at the same time, there is truth in what he says, but when you do drop them at the same time they both give each other a little less distance to travel , therefore they do reach earth at the same time (doing this experiment in a vacuum to escape from factors like Terminal Velocity). Leaving one stationary while dropping the other, the stationary one is adding it's mass to the earth creating two different reaction speeds of earth.
@jl1849
2 жыл бұрын
No, the two balls would not fall at the same speed unless in a vacuum. Here is why: Lets look at Newtons 2nd Law: The sum of all forces (F_tot) on an object is equal to mass * acceleration of that object F_tot=m*a. Let's look at this law only in the direction of gravity: You have two opposing forces that act in that direction under realistic conditions: Gravitational force F_g=m*g and Drag Force F_d which depends on the bodies shape, speed and - yes NOT mass! BUT, if we now look at Newton's Second law and rearange it a bit you will see: a= F_tot/m = g - F_d/m Therefore if your ball is very heavy, the Drag Force F_d has almost no impact on the acceleration since it is divided by m. Therefore a heavy ball accelerates more than a light ball (e.g. a balloon) towards earth. Both balls however will eventually reach a different terminal velocity, since the Drag Force F_d will increase with the square of the speed and thus oppose the acceleration of the ball more and more. Note that in a vaccum the drag Force would be 0. Therefore F_d = 0 and then the acceleration would no longer depend on the mass of the object. Unfortunately, this is not stated/formulated properly in the Video from Veritasium.
@giannisniper96
8 жыл бұрын
wow lots of wise guys here on youtube telling us that air resistence exists so this is just a simplified model, thanks!
@angelkj
10 жыл бұрын
Just to point out, everything falls at the same rate in vacum because there's no air friction. In real world objects of differwnt shapes accelerate/slow down when falling vertically because of air resistence on the object.
@Fransamsterdam
7 жыл бұрын
This video shows more evidence about misconceptions in education than about misconceptions about falling objects, though they might be entangled.
@IsaacWilcove
8 жыл бұрын
The similar video he is referring to in the description is his second ever KZitem video. This video can be found on his first KZitem channel, "Derek Muller", which is also his name. Came across this gem when looking for a veritasium video. Also, this is the exact same place where he filmed the original falling object video.
@kenjiyamane2558
6 жыл бұрын
Whoaaaa you made a misconception in your video about misconceptions, gravity is not associated with forces, it is with the curvature of the 4D space time
@ho7026
4 жыл бұрын
i was scrolling in hope of finding this comment
@Kakanics
4 жыл бұрын
he has made a new video, explaining this
@ho7026
4 жыл бұрын
@@Kakanics yep, such a good explanation as well
@Kakanics
4 жыл бұрын
OH imagine if this guy watched that video and then came here ;P
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