*Are the lengths in the diagram at **8:14** backwards?* No, they're not backwards. They are correct. In a hyperbolic geometry, the hypotenuse can be shorter than one of the other sides. Pythagorean theorem (a^2 + b^2 = c^2) only applies to Euclidean space. The hyperbolic version is a^2 - b^2 = c^2. Instead of a plus, there's a minus. Get on board. *Wouldn't light travel along a 90-degree angle rather than a 45-degree angle?* No, light travels through time just as much as it does space. That's 45 degrees. An angle of 90 degrees would be traveling through space _without_ through time... also known as teleportation. Light does not teleport. Yes, it's true that light doesn't experience time or space, but a spacetime diagram is never drawn from light's reference frame. It's only ever drawn from a massive object's reference frame. For light, both of the axes would rotate up to the 45-degrees and be parallel to each other (and to the path of light)... which means there's no perspective to measure from anymore. *Twin's Paradox:* You can't really compare clocks the way we _want_ to compare clocks unless there are two events in common... which requires at least one of them to break the symmetry (either by accelerating or traveling around a curved universe or something similar). I discuss this in a video from a couple years ago: kzitem.info/news/bejne/tn-k0naAbYefooY
@sabrisevmezhicsevmez8135
4 жыл бұрын
but were photons not supposed to not experience time? if there is no time for a photon, how could it be traveling through time?
@Lucky10279
4 жыл бұрын
@@sabrisevmezhicsevmez8135 He answered this question before: from the reference frame of a photon, time is frozen, but from our reference frame, it's not.
@sabrisevmezhicsevmez8135
4 жыл бұрын
@@Lucky10279 so does it mean that if we tilt the spacetime diagram 45 degrees to the reference frame of a photon, it would be only traveling in space and not in time? Why do the axes get distorted when tilting the diagram and by which scale?
@Lucky10279
4 жыл бұрын
@@sabrisevmezhicsevmez8135 I think so, yes. I'm not sure what you mean about the axis' getting distorted though.
@Mallchad
4 жыл бұрын
this helped immensely but one suggestion to help people understand, especially whats going on with this hyperbolic triganometry *weirdless* is to reiterate the differences in the spacetime graphs for the two observers. It kind of makes sense to me that the short side can measured as longer but only after I have visuallised the other graph. *(If I even understood that correctly)* Can I also suggest trying out swapping the two observers space time diagrams (rotating the axis in place for better visual aids and plotting that against something like a 3rd object or other measurments?
@freepointsgals609
4 жыл бұрын
Geometry is underrated.
@ScienceAsylum
4 жыл бұрын
Agreed.
@Dayumms
4 жыл бұрын
@The Science Asylum nope. This whole channel is underrated... how much years to learn.. how much hours to prepare a video... how much time to cut the vids... and i didn't talk about the motivation, the faith and the teaching skills. Only 232k subsricbers. Take a look at a trash rappers YT channel... makes me sad. Love you TSA, from Hungary
@showcase-me
4 жыл бұрын
And awesome!!!
@arnesaknussemm2427
4 жыл бұрын
Geometry is very important. Shape up or ship out as they say ;)
@Lucky10279
4 жыл бұрын
Agreed. _Especially_ trigonometry. It shows up all over the place in physics and linear algebra. Pretty anytime there's something involving rotation, contraction, or projection, it's likely that trigonometry is going to show up somewhere. Oddly, while I greatly enjoyed learning trigonometry itself (I used Khan academy and their trig course is quite well designed and made it really fun), it wasn't until I took linear algebra and then physics that I fully appreciated it.
@zakopako82
4 жыл бұрын
I literally cracked up when you said MUONS FROM SPACE!!!!!!
@jamesmnguyen
4 жыл бұрын
BLACK BALLS IN SPACE!
@zakopako82
4 жыл бұрын
@INERT LOL Sorry, I have a bad habit of saying it all the time :-P
@sqwirl05
4 жыл бұрын
@@zakopako82 I got you--whenever you feel tempted to say "I literally...", just say "Practically, I..." or "I virtually..." It has the same mouthfeel, is grammatically correct, and joyless dillweeds like INERT will leave you alone.
@GlenHunt
4 жыл бұрын
In all seriousness, I love seeing things like this over and over, explained by different people. That, and playing around with it in my head are the only ways for me to really understand it. I'm not one who can usually just get it at first glance.
@ScienceAsylum
4 жыл бұрын
I'm not sure _anyone_ can get this at a first glance.
@chacubra
4 жыл бұрын
@@ScienceAsylum yeah, getting familiar with a concept that is pretty counter intuitiv should take you some time
@prateeksharma5051
3 жыл бұрын
@@chacubra 😀🙃 Time plays here also.
@prateeksharma5051
3 жыл бұрын
@@chacubra 😀🙃 Time plays here also.
@NERDSAUCE
2 жыл бұрын
@@ScienceAsylum my one singular synapse sure can't but it wants to so hard
@Lucky10279
2 жыл бұрын
7:14 This is one of the best illustrations of time length contraction I've seen. This is also the only time I've seen a _quantitative_ geometric description of a hyperbolic trig function.
@ScienceAsylum
2 жыл бұрын
You're going to love my next video then 🤓
@Lucky10279
2 жыл бұрын
@@ScienceAsylum Why, what's the topic?
@ScienceAsylum
2 жыл бұрын
@@Lucky10279 I don't want to spoil too much, but it's about how speed works in hyperbolic spacetime. (Let's hope it performs better than this one originally did when I uploaded it.)
@Lucky10279
2 жыл бұрын
@@ScienceAsylum Sounds cool! You've talked about that before, but not in detail, so it'll be nice to have video just about that. :)
@ScienceAsylum
2 жыл бұрын
kzitem.info/news/bejne/14afl6Cveqplqqg 🤓
@Dr.Teddy.Wilding
4 жыл бұрын
Am I the only person who watches Nick's videos 5 times in a row, pausing and rewinding between every other sentence? Great stuff, Lucid!
@LuisAldamiz
4 жыл бұрын
Probably, I only do that once or twice, five times is a bit too much... there's a point when one has to acknowledge the finitude of his/her own capacity of understanding.
@IanFarias00
4 жыл бұрын
Something that took me a long time to understand is why are those observers not measuring the same two events when calculating the interval, but the thing is, simultaneity is not fundamental, it's given by each observer and they may disagree.
@glarynth
4 жыл бұрын
One of my favorite thought experiments is to imagine a docking bay on the space station with two doors, fore and aft, so that the rocket can fly straight through. The docking bay is too short to hold the rocket at rest, but longer than the length-contracted fast rocket. Could you trap the fast rocket in the docking bay by shutting both doors while it's flying through?
@Lucky10279
4 жыл бұрын
Yes, exactly. The relativity of simultaneity is fundamental to SR.
@IanFarias00
4 жыл бұрын
@@glarynth That's the barn-pole paradox reframed into the space context ^^
@Lucky10279
2 жыл бұрын
0:35 The look on your face is so intense. I don't think I've ever seen someone get so excited about geometry before. That's the kind excitement that gets people invested.
@josewandasson7641
4 жыл бұрын
we missed you here from Brazil, man! congrats!
@razeezar
4 жыл бұрын
I really feel like this channel deserves to be at least 10x more popular. Perhaps even moreso, depending on how much an observer is moving relative to this channel!
@markcornwall1184
4 жыл бұрын
l see subjects lve seen many times before but somehow you twist it in a way that suddenly makes it click keep up the good work.
@iamjimgroth
4 жыл бұрын
Welcome back, Nick. Excellent as always.
@ScienceAsylum
4 жыл бұрын
Thanks! It's good to be back.
@brousbrous
3 жыл бұрын
The visual at 6:41 was very useful. Thank you and great work!
@erikawanner7355
4 жыл бұрын
Makes perfect sense when you do the math! Love it! I always thought that it was ACTUALLY a different length.
@mab7489
4 жыл бұрын
They ARE different lengths! It's just that it depends on the observer
@erikawanner7355
4 жыл бұрын
Matthew B. I meant LITERALLY different lengths; but he explained that.
4 жыл бұрын
Congratulations on your amazing science videos. This one about the geometry of relativity is wonderful (and very enlightening). Keep up the nice job!!!
@hgtrad7655
2 ай бұрын
The best "populistic with a bit more scientific knowledge" on the subject, I liked your explanation on hyperbolic space and the tanh!! Thank you
@mutterkuchen7387
3 жыл бұрын
I just bought your book and it's funny how I can hear your voice in my head while reading haha.
@alexvilonyay8597
4 жыл бұрын
Check your notifications KZitem changed some stuff so the bell may need to ring it again! Love this channel your enthusiasm is contagious
@ScienceAsylum
4 жыл бұрын
🤦♂️ I hadn't heard that. I'll look into it.
@alexvilonyay8597
4 жыл бұрын
@@ScienceAsylum other channels I have been watching seem to be having the same issues... Other speculation is that KZitem is putting the video into the public different than what was the normal because after about a week or so their views seem to catch up to their average...I hope you get it figured out you are one of the best science channels I have watched and I hate to see you struggle....I'm a crazy for life!!keep on keeping on Nick Lucid!!!
@klyons217
3 жыл бұрын
It's funny how if you see a ship in the distance, and it's broadside is facing you (say, East-West), it looks a certain length. Then when it turns toward another axis (say, toward the North) it appears shorter because of the angle. This makes sense to people. But when it "turns" toward the time axis (by going very fast) and it contracts, this is mind-blowing for people.
@ScienceAsylum
3 жыл бұрын
Yeah, the distortion in spacetime diagrams is _unreal._ Unfortunately, there's no way to fix it.
@philjamieson5572
4 жыл бұрын
Thanks for helping me to understand these amazing concepts.
@atman4437
4 жыл бұрын
The best physics learning channel in the whole KZitem love it ❤❤❤❤❤
@QuantumLeaper25
4 жыл бұрын
I can't say that I got all of it, but it did help a lot. You and Vsauce have helped me out more than anyone.
@lourencoentrudo
4 жыл бұрын
Glad to see you're back!
@ScienceAsylum
4 жыл бұрын
Good to be back!
@lourencoentrudo
4 жыл бұрын
@@ScienceAsylum 😊
@ryan-cole
4 жыл бұрын
I recently learned of a version of this that uses regular Euclidean geometry. Basically, by flipping the metric and using proper time as the coordinate instead of time.
@ZagrosŞêxbizin
4 жыл бұрын
Question: This is probably the best video i’ve seen on youtube so far. And I started to think that the Science Asylum is fun enough for children to get interested and at the same time satirical and scientifically accurate enough to educate adults in physics. And I will now pose my question related to this video’s topic: If a child and I, each have this video at its beginning but on pause while onboard our own spaceships, one having departed one second after the other in order to have been launched from the same location and traveling on paths that are parallel to each other, at constant velocities with respect to each other and our common coordinates of departure and apart from each other by, lets say, a hundred meters. If the child and I press the start button to play the video at the same time but the child whose rocket was behind me starts accelerating at the same instant at which our videos started playing, will I see trough my window and hers, the earlier scenes of the video that we had started watching at the same time while she passes by me and would she see the earlier scenes when she looks at my video?
@rafaelricardovilorio602
4 жыл бұрын
Casual KZitem science vid viewer from Chile saying hi to Nik! 🙌🏼
@ScienceAsylum
4 жыл бұрын
Hi 👋
@natealbatros3848
4 жыл бұрын
Thanks for another amazing video, really appreciate your work
@adityachk2002
4 жыл бұрын
Even vsauce and physics girl released a video at around the same time. That’s a recipe for party!
@XEinstein
4 жыл бұрын
1:48 no superzoom mentioned ☹️ 5:12 YES! We did get a fastfast though ☺️
@ATINKERER
Жыл бұрын
I would have liked you to discuss the relationship between time dilation and length contraction.
@NightlySonata
2 жыл бұрын
Wow..... I wish my physics teacher had explained it like that. I could never get my head around the 'atomic clock' and 'train' explanation, they never made sense to me.
@ScienceAsylum
2 жыл бұрын
Glad I could help 🤓
@Mysoi123
2 жыл бұрын
The time interval is the spacetime separation between two events that occur at the same place. hmm, I guess it is only same place in the x' axis, where we put delta x' = 0. so it reduced to the normal time dilation equation, I guess the time interval does mix two events at delta y' locations.
@ScienceAsylum
2 жыл бұрын
Right, the "same place" is a relative concept... which is why the time interval measurement is also relative.
@JC-uk8lp
4 жыл бұрын
@The Science Asylum: another great video!
@DarrinCullop
Жыл бұрын
Thank you so much! You've helped me understand this more in under 11 minutes than a 11 hour Brian Green video. The missing element was the hyperbolic geometry. Thank you for having faith enough in your viewers to not dumb it down. 🙏🏻😁 To be clear: Brian Green is amazing and I love his work, I'm just saying this video helped me more. It was a compliment for Nick, not a diss on Brian Green (who has also taught me a lot).
@ScienceAsylum
Жыл бұрын
Glad I could help 🙂
@RupamKumari-vo6wm
4 жыл бұрын
Best video on relativity. We want videos on CALCULUS Please please 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏 🙏
@thedeathcake
3 жыл бұрын
I like how your comment section is filled with good, relevant comments. So many times you scroll down to see some copy and pasted comment about a guy writing himself saying something 'funny'. Great stuff mate!
@ScienceAsylum
3 жыл бұрын
Yeah, my comment section is mostly good. I feel pretty lucky.
@andreasoppen6530
4 жыл бұрын
Awesumsauce! Not too detailed, not too simplistic. Rather, you hit the sweetspot in between. Keep it up, and for the love of all that is holy: Continue the dorkiness and geekonometry! I need it! 😀👍
@AnuragXorma
4 жыл бұрын
We are studying Special theory of relativity and the other day, the professor just said that this happens and wrote the equation. She didn't explain anything. Thank you for this video. This helped me a lot in understanding the concept. Edit: Typo
@ScienceAsylum
4 жыл бұрын
You're welcome! Glad I could help 🤓
@AnuragXorma
4 жыл бұрын
@@ScienceAsylum 🙇♂️🙏
@GALACTICSAVANT1o1
4 жыл бұрын
thx i was having doubts about this and u explained it thanks a lot
@kzeich
4 жыл бұрын
Brilliant subtle plug for your book. Nice
@CoolDudeClem
3 жыл бұрын
Theese videos confuse the hell out of me, but I can't stop watching!
@caspermok
4 жыл бұрын
This video is awesome. It is so easy to understand. Thank you
@ScienceAsylum
4 жыл бұрын
You're very welcome! 🤓
@rikthecuber
4 жыл бұрын
Thanks for a math related video...i love maths.. .want to see more maths in the channel
@ramprakash1562
4 жыл бұрын
Please go deeper.... Deep Deep inside physics... generally we are taught only literature of physics...not the real physics..i found real physics here.. thank you Nick.
@padrickbeggs7071
4 жыл бұрын
I gotta day this channel has reallllyyyyy grew on me
@taw3e8
4 жыл бұрын
8:55 DEEPER!!! Please
@FacetsOfSerenity
4 жыл бұрын
Every time you say "a ratio" I hear "Horatio". Otherwise, this is perhaps my favourite video you've ever done.
@chinmaykulkarni4013
4 жыл бұрын
Here's a thought experiment. Consider the same situation as in the video, and the stationary person sends 2 photons parallel to each other at a distance of 16.7m from each other such that they will barely pass rocket clone and the photons miss either end of the rocket. However from rocket clones perspective he is 20m long so the photons will hit his ship. So from stationary persons perspective the photons miss the rocket but from rocket clones perspective they do not. PARADOXXXX
@vedangratnaparkhi
4 жыл бұрын
Yeah, I would like to know that too
@thedeemon
4 жыл бұрын
The answer is relativity of simultaneity: note how the space axis rotates too, so two events simultaneous for one observer are not simultaneous for the other. So if the two photons are fired simultaneously in the station's reference frame, in the reference frame of the rocket they are fired one after another with a delay, so the distance between them is 20m, not 16.
@narfwhals7843
4 жыл бұрын
Also known as the Pole-barn or Ladder paradox. The explanation is given by thedeemon. In rocket clones frame the photons don't pass him at the same time. en.wikipedia.org/wiki/Ladder_paradox
@coltbrumm5559
5 ай бұрын
I can imagine somebody saying "Person 1 says the rocket is 15 meters long and Person 2 says the rocket is 20 meters long, but if it is a 20-meter-long rocket then only 1 of those is right." This would certainly mesh with the intuition that relativity challenges. What is the intuitive way to explain that in Person 1's reference frame, the 20-meter-long rocket actually IS 15 meters long?
@maazfaridi4900
4 жыл бұрын
I know what you did at 5:53 😃 ... great explanation as always
@ScienceAsylum
4 жыл бұрын
Who? Me? 😉
@valerioboldreghini4239
4 жыл бұрын
As usual, awesome work!
@christopher3790
4 жыл бұрын
Great video Nick!! Thanks again
@foxhound1008
4 жыл бұрын
Great video! Can you do a video on the Bell Spaceship Paradox? Which is in along these lines.
@frankroos1167
4 жыл бұрын
It helped. But one thing I would like to see explained in a similar way: Relativity means station clone sees rocket clone's clock run slower. Rocket clone sees stations clone's clock run slower. As long as they keep moving, no conflict. As we have seen in this explanation. But what happens when they match speed? Which clock will end up looking like the slow one? (I know the answer: The one that changes frame of reference.) I am guessing that happens on the accelerating bit of the story. In particular, accelerating form one speed/angle to another. That feels like something to explore. Too bad I am not that good at math and visualization. It also feels like it gets complicated. Does it?
@narfwhals7843
4 жыл бұрын
Nick already has a video on the twin paradox, with spacetime diagrams! kzitem.info/news/bejne/tn-k0naAbYefooY
@kagannasuhbeyoglu
4 жыл бұрын
Welcome again. The best teacher. 👍
@dema-3000
2 ай бұрын
But why you are using hyperbolic geometry for non-accelerating objects 8:14?
@Villaboy78
4 жыл бұрын
Love how this concept of length contraction explains some really mad stuff but also things we take for granted like how electromagnets work ... hyperbolic minkowski space though - why’s it ‘got’ to be this way ? Do any other geometries also give us the effects we see ?
@Violent2aShadow
2 жыл бұрын
Remember when you see "that guy" that zooms by you in a sports car. He's clearly trying to compensate for "length contraction".
@ritemolawbks8012
2 жыл бұрын
Then he should stay parked and perpendicular to our frame because the contraction is making it look like he's having a cold shower.
@joegillian314
3 жыл бұрын
"It's all just geometry..." Why did nobody say it until now? Also, black is the new orange...does this have something to do with the fact that brown light is actually orange? Therefore black is orange? (because black is actually very dark brown?)
@denkenunddanken5961
4 жыл бұрын
Finds difficult to understand everything, still awesome, gives lot of New ideas
@benburdick9834
3 жыл бұрын
I would have loved to have watched this video before I took my test on relativity...
@stevesmith7839
3 жыл бұрын
THANK YOU! I have tried to tell people that the shortest distance between two points is NOT a straight line. In order to measure the distance between two points, measurement itself must be absolute, therefore, all we can do is measure the abstract, static distance, but even this is not accurate because space itself is curved.
@Area207
2 жыл бұрын
I have watched tens of videos on length contraction and understood what happens and under which circumstances it happens, but I never understood how or why it happened until this video. I still don't understand how space becomes hyperbolic in the real world, not just on a graph, but I do understand how length contraction occurs now!
@Area207
2 жыл бұрын
@silverrahul Something changes though, because the the planets looking like pancakes isn’t an illusion, right? Also for the speed of light to remain constant in all frames, doesn’t space have to contract?
@Area207
2 жыл бұрын
Thank you for taking the time to reply. Special relativity and quantum physics are two subjects I love to hate. I love them because they are the closest thing to magic in the real world and that sets my imagination soaring with possibilities… but I also hate them because they are so counterintuitive in their very nature that it makes it hard to wrap my brain around.
@yashkalpsharma9809
4 жыл бұрын
Thank you Sir!
@shivakarthik7373
3 жыл бұрын
A good reference book: "It's about time" by David Mermin
@jamest.5001
4 жыл бұрын
Krazy is BACK!
@T1000-s4j
4 жыл бұрын
I love this man 😊 the algorithms need to kick for you, Nick, so you get more views ↗️
@jaysalbhatt2501
4 жыл бұрын
Yea , the great teacher. Richard Feynman of the 21st century.
@ChrisWalshZX
4 жыл бұрын
Not quite deep enough Nick! The most beautiful thing about this special relativity stuff for me is back at the definition of length (5:40) i.e. it's *spacetime* separation not space separation. Different observers disagree on the measurement of the space and time components of the length but the length in *spacetime* always agree (invariant). Woah!!!
@joetylerdale
3 жыл бұрын
If you were in your observation booth and could see a spaceship traveling by very fast and there was a clock in the front of the ship that you and the pilot could see, what time would you both observe?
@ScienceAsylum
3 жыл бұрын
The pilot and I will disagree on whether or not our separate observations happen at the same time. So, I'll answer your question with another question: _When_ do we observe the clock? (There's not really a satisfying answer.)
@lawliet2263
2 жыл бұрын
This guy knows his stuff
@deer001
2 жыл бұрын
If I ever manage to make some money, the first thing I would do is support you on patreon! I love you nick🥺 Thanks for educating us🙏
@davidward5968
4 жыл бұрын
I love watching these videos, and understand at the time of watching, just wish I could retain it. But to answer your question, no, not too deep.
@rgmartinez
4 жыл бұрын
Geometry is very powerful!
@konozrashid887
2 жыл бұрын
When you talk about time dilation, then actually, the rocket is moving relative to the stationary space station so, when we compare the two clocks, whose clock will actually be, literally, behind in time?
@tuyt01
Жыл бұрын
Great video! At 8:11, going strictly by the right-angle triangle as shown, how can the hypotenuse (tp=1 minute) be less than the height (t=1.2 minute)? I do see the hyperbolic cosh angle, but t and tp are sides of a 90 deg triangle. What am I missing here please? Thank you.
@ScienceAsylum
Жыл бұрын
You're thinking in terms of Euclidean geometry, where the sides of a triangle are governed by Pythagorean theorem: a²+b²=c². However, this is hyperbolic geometry. They're hyperbolic triangles, where the sides are governed by: a²-b²=c². It's subtraction instead of addition.
@scptime1188
3 жыл бұрын
So how do the geometries change? As in, what does the weird stretchy rotation of the grid physcially represent.
@ScienceAsylum
3 жыл бұрын
The "weird stretchy rotation" represents a change in point of view. In one state, the grid belongs to one observer. In another (rotated) state, it belongs to a different observer. The grid belongs to whoever isn't moving in the space of that grid (as in only moving in time).
@scptime1188
3 жыл бұрын
@@ScienceAsylum Ah, thanks.
@Why-sn5gt
3 жыл бұрын
Absolutely excellent you brilliant man
@frictyfranq321
4 жыл бұрын
Umm.... If a charged particle is "rotating" in a curved spacetime, it's supposed to be acclerating right? So from "our" perspective we should see it lose energy. But from the perspective of charged particle, it's moving in a straight line. Does gravity cause an acceleration even in the "straight" direction of the charged body?
@tommywhite3545
4 жыл бұрын
When talking about "rotating" in a curved spacetime. It's a geodesic, meaning it's in free fall. Free fall is actually the only kind of real intertial frame in general relativity, so it's actually NOT acceleration (read about the equivalence principle) and so it doesn't lose energy in any way just by freefalling. Curved spacetime causes gravity and give these geodesics and with that these free falls.
@frictyfranq321
4 жыл бұрын
@@tommywhite3545 Amazing! Thanks for the clarity.
@tommywhite3545
4 жыл бұрын
@@frictyfranq321 Sure. Maybe it's worth mentioning that light (massless particles) always travel null-geodesics and massive objects timelike geodesic. And in simple speak a geodesic is a straight line following the curvature of a spacetime. (Becoming really weird inside black holes 😉👍.)
@tinldw
4 жыл бұрын
I think what's confusing about these explanations is that the rocket flies by in graphics but flies straight away (the only way available) on the space time diagrams.
@ScienceAsylum
4 жыл бұрын
That's a fair complaint.
@ritemolawbks8012
2 жыл бұрын
[ 5:50 ] I enjoyed you advertising your book: _Advanced_ _Theoretical_ _Physics. If your book is as good your KZitem show ( _The_ _Science_ _Asylum_ ) , it will be flying off the brook shelves. It could be used as a supplemental text in graduate-school courses.
@mjproebstle
3 жыл бұрын
rocket clone’s rocket has some nice carpeting in it
@ScienceAsylum
3 жыл бұрын
Long journeys require comfort 😉
@alfadog67
Жыл бұрын
High-Jumpers get taller as they leap off the ground! And the bar gets shorter!
@Saitama62181
4 жыл бұрын
Interesting, as always. Is the length contraction inversely proportional to the time dilation?
@ScienceAsylum
4 жыл бұрын
I wouldn't say that as a general rule. It depends on who is measuring and what exactly they're measuring. You have to do the math each time.
@thedeemon
4 жыл бұрын
Not inversely. Same factor, gamma. en.wikipedia.org/wiki/Lorentz_transformation#Physical_implications
@Sutrabla
3 жыл бұрын
If rocket speed is lightspeed, time stands still? From the rockets perspective, travel is instant, and it's lenght is 0? Oh yes, and mass is infinite...? Aaaand >POOF< everything collapses down into a super singularity. Or not, as time has stopped...? Do we experience time and have mass ourselves because our speed through... Space?
@SK-ow4vw
3 жыл бұрын
The mass (or better momentum) is only infinite from the perspective of an outside observer because according to them YOU WILL TAKE A AWFUL LONG DISTANCE TO STOP. For you all distances are very small so everything seems normal when you put the brakes on.
@saifahmed8870
4 жыл бұрын
According to loop quantum gravity you can't get below a certain length doesn't that violate length contraction(special relativity)
@ManyHeavens42
2 жыл бұрын
Didn't we have this conversation before hahaha.yes we did. Time won't give me Time ? Hahaha
@petevenuti7355
3 жыл бұрын
I assume you can be contracted to less than a Planck length? Any theroy on the ramifications of that?? Like if 2 objects could go that fast fast would they pass through each other without impact? Or would it be like dividing by zero, as in asking about something that's small just doesn't make sense? Or would that speed involve energy levels high enough to be converted directly into mass like particle generation in accelerators?
@Nate-lm1wj
3 жыл бұрын
Do you have a day job or are you only a 'Science Communicator' on KZitem? No offense or judgement intended. You do a great job and you're way smarter than me for certain. I just want to know who I'm getting my information from. Thanks.
@ScienceAsylum
3 жыл бұрын
I used to be a physics professor, but making these videos is my job now.
@playgroundchooser
4 жыл бұрын
Dude... I took an entire semester class in college on Relatively... And this explained it better. 👏👏 Welcome back!
@ScienceAsylum
4 жыл бұрын
Thanks! It's good to be back!
@Lucky10279
4 жыл бұрын
I think helps that Nick can devote a couple weeks to each video and he consistently takes into account viewer feedback about what's helpful and what isn't. I'm going to guess that most Professor's are teaching several classes at a time and probably giving two lessons per class each week and so aren't able to devote that kind of time to planning each lesson and listening to student feedback, let alone making all the animations Nick does. In other words, don't be too hard on your professors. Their circumstances likely don't permit them to explain things the way KZitemrs can.
@tricky778
4 жыл бұрын
@@Lucky10279 I dunno. I saw an old Winnie the Pooh cartoon where Winnie was bouncing down the stairs thinking "There must be a better way to go down the stairs... If only I had time to work out what it was."
@oflameo8927
4 жыл бұрын
You should ask for your money back.
@Lucky10279
4 жыл бұрын
@@oflameo8927 I wish you could get your money back from colleges when the classes are poorly taught.
@Lucky10279
4 жыл бұрын
"Speeds are measured as angles." That's so cool! Trigonometry is awesome. This is also the first time I've actually appreciated _hyperbolic_ trigonometry, so thank you for that. ;)
@MaintDocs
Жыл бұрын
Speed is a rate, which is just a ratio, which is just a slope (rise over run): hence speeds are measured as angles.
@shubhronildutta1563
4 жыл бұрын
This is probably the only channel which presents the material in a lucid way(no pun intended!) without dumbing it down too much. Absolute treat, Nick!
@Danilego
4 жыл бұрын
No pun intended? It was a great pun though!
@shubhronildutta1563
4 жыл бұрын
@@Danilego Thanks 😁 but I was not going for it, I noticed it later.
@Zeegoku1007
4 жыл бұрын
Nick LUCID 😏
@cesarsosa4617
4 жыл бұрын
I find physics hard to understand when it's dumbed down. Much easier to understand when you do the math and look at the geometry
@rodrigoappendino
4 жыл бұрын
So you should meet the PBS Space Time.
@thestalost8486
4 жыл бұрын
I follow this channel from its very early days. And now as a physcis student, I can finally point to things and say: "Hey. I kinda know that!".
@andie_pants
4 жыл бұрын
Edit: sorry, meant to tack this onto my own comment, not yours. Not that yours isn't a lovely comment. :-) I still don't understand the thought experiment of the astronaut who zips away at almost light speed for a while and because of time dilation returns back to Earth way younger than everyone else who used to be the same age. Fine, ok.... but doesn't that also mean that from the astronaut's point of view the Earth zipped away at near light speed and came back with its time having sped up instead of slowed down?
@koharaisevo3666
4 жыл бұрын
@@andie_pants That's called the twin paradox, and if i remember correctly there is a video on this channel about that.
@theslay66
4 жыл бұрын
@@andie_pants This is true for observers that are in inertial frames of reference, or in other words, not accelerating. But in your example, for the astronaut to zip away then come back, he would have to accelerate at some point, which makes all the difference. For more info, there is indeed a video on this subject on this channel.
Me too (though I'm actually an engineering student). It's a good feeling, especially when I can actually answer some of the questions people have in the comments.
@richardeadon6396
4 жыл бұрын
2:10 Your rocket's always longest when you measure it yourself 😉
@अंशुमानअवस्थी
4 жыл бұрын
"rocket"haha
@ScienceAsylum
4 жыл бұрын
🤦♂️ I'm surprised the dirty jokes took this long to show up in the comments.
@richardeadon6396
4 жыл бұрын
@@ScienceAsylum I saw my chance and I took it
@orionred2489
4 жыл бұрын
@@ScienceAsylum They happened sooner for me, but I'm moving kinda slow.
@orionred2489
4 жыл бұрын
Don't forget to account for curvature.
@smokey04200420
3 жыл бұрын
Dated a girl in my General Relativity class. One day she asked “Do you always last this long?” Looked her dead in the eyes and said: “It’s relative. Depends how fast we’re going.” Without skipping a beat she replied: “I guess that explains length contraction.” Yeah we didn’t date very long.
@Cronofear
4 жыл бұрын
This video makes the universe look like a videogame. Everything can be explained down with geometry and vectors, just like in the games!
@russellpowell2656
4 жыл бұрын
Or do the video games mimic reality of geometry? Just blew your mind lol
@imaginaryuniverse632
4 жыл бұрын
Everything we experience is our individual perception of the the information we receive. Everything we perceive is solely information including space and time. How far away something appears to be is in the information that we receive and our perception. I will tell you what is danced around by most scientists but is evidenced by the definitions of the words they use to explain the Universe. A point is a thing which has no parts and thus can only be conceived of let's say in imagination. Within a point can be defined an infinite number of points with a definite position relative to the boundary of the initial point. It's amazing how we can choose to imagine a beach just in general and the image of a beach will instantly appear in our minds eye and will actually replace what we see with our eyes if we focus on the image. If we continue to focus for a time events will naturally appear in our imagination like waves and wind without our needing to create them intentionally, the scene unfolds with our perception of the information attracted by our initial intention based on our previous experience. However, we can choose to imagine different things appearing in our minds eye in general ways like adding people or specific like particular people. Einstein said imagination is more important than knowledge. I think that's because knowledge is what has been conceived in imagination and doesn't exist anywhere else because there is no where else for it to exist.
@kevin42
4 жыл бұрын
@@russellpowell2656 or do the games mimic the game were in. Simulation theory. Now thats a wild ride
@ElleR555
4 жыл бұрын
i want to like this comment but it has 42 likes....the meaning of life....
@angeldude101
2 жыл бұрын
That comment seems redundant. Vectors are just oriented line-segments, and line-segments are just a part of geometry. Add in areas and volumes and you can describe almost anything. Everything is geometry!
@titusxp
4 жыл бұрын
This is mind altering. Events that occur at the same place from one reference frame may have occured at 2 different places from another reference frame? aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah!!!!!!!!!! My respects sir. Here in Cameroon we'd say "you have sense"!
@ScienceAsylum
4 жыл бұрын
*"Events that occur at the same place from one reference frame may have occurred at 2 different places from another reference frame? "* Yes 😱🤯
@Lucky10279
4 жыл бұрын
It is pretty mind-blowing when you put it like that. Unfortunately, (or fortunately, depending on how you look at it) the S.R. unit in my modern physics course did such a good job introducing this idea that it didn't blow my mind _at all._ It just seemed immediately intuitive to me. The again, I may be giving the curriculum too much credit. I'd also watched Nick's other SR videos multiple times over the years, so I was already familiar with the basic ideas of SR. If you want more details about this concept, look up "relativity of simultaneity."
@ItsEverythingElse
4 жыл бұрын
@@ScienceAsylum "Events that occur at the same place from one reference frame may have occurred at 2 different places from another reference frame? " "May"? Under what circumstance(s) would they? I think that statement is really not worded correctly. Event time and position is always relative to the reference frame so of course they will always be different for different reference frames.
@ScienceAsylum
4 жыл бұрын
@@ItsEverythingElse Everyone will agree on the place and time if the two events happen at the same time _and_ place.
@PompiisGarage
4 жыл бұрын
@Grabo Johnson, first we have to clear up some definitions. "Place" in this case is the "Event", which has two coordinates in Space-Time. Space and Time. There is only one Event. From a different Time Reference Frame, if the Event is seen at the same Space, it will be seen at a different Time. If the Event is seen at the same Time, it will be seen at a different Space. Hope that helps.
@rayzorrayzor9000
4 жыл бұрын
“The Universe doesn’t just look different to different observers , it is different “, Wow I never really thought of it that way , once again Nick you’ve educated me . Thanks .R.
@pawemarsza9515
3 жыл бұрын
It is a lie though. Unintentional but still a lie. Universe IS the same for every observe, and it just looks differently. The real explanation is: "Space and time aren't absolute realities, THEY ARE JUST MEASUREMENTS, dependent on the perspective"
@brawnstein
4 жыл бұрын
8:14 Wait why is the hypotenuse shorter that the perpendicular ? Or is it cause of Hyperbolic Trig?
@ScienceAsylum
4 жыл бұрын
Hyperbolic geometry is _super_ weird.
@erikawanner7355
4 жыл бұрын
MaSK the reference angle is not 90 degrees like with regular cosine/sine. Hence the weirdness!
@asaidinesh5220
4 жыл бұрын
Well,i was about to ask this....got the same doubt...😅
@Mathieu_Matheow_Benoit
4 жыл бұрын
@@ScienceAsylum your face in the thumbnail sums it up pretty good 😅😂
@sabrisevmezhicsevmez8135
4 жыл бұрын
@@ScienceAsylum so much for intuitiveness.
@AliothAncalagon
4 жыл бұрын
Thank you so much. I literally just thought the other day that thats a topic your take would be helpful for. I mean, I know how all of this works mathematically, but thats really not enough for me anymore. You spoiled me xD
@ScienceAsylum
4 жыл бұрын
You're very welcome 🤓
@joshanonline
4 жыл бұрын
@@ScienceAsylum Thanks. I needed this explanation. But I need to know more: Since distance is what we measure between two events happening at the same time and it's the same measurement elsewhere in 'normal space,' does Spacetime itself have a distance component to make sense of everything? Like a literal fabric at plank length. Otherwise there is no reason for the distance between same atoms to be the same or the speed of Light to be constant. Or is Time responsible for distance?
@anmolmehrotra923
4 жыл бұрын
Commenting to get answer
@Lucky10279
4 жыл бұрын
@@joshanonline I think what you want are space-time intervals. MinutePhysics did a video about them.
@AliothAncalagon
4 жыл бұрын
@@joshanonline I think I can confidently answer your question if you evaluate it further. What do you exactly mean? In General Relativity itself there is no smallest Quantity of spacetime like a planck length if thats your question. "Normal space" doesn't really exist in relativity in the first place. Every point of view is "normal". They technically all disagree with each other. And all of them are correct. I don't understand why you need a "distance component" for spacetime to make sense of the measurements.
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