@9:57, velocity is equal to *displacement* over time, not distance over time. This is a very small but important distinction just as a reminder to those watching! Distance traveled over time is related to speed, which is a scalar quantity. Displacement over time is related to velocity, which is a vector quantity.
@reyza3640
Жыл бұрын
Thanks
@jimmyti9cer
12 жыл бұрын
I love how he repeats stuff as he writes it. I dont know why but it helps for some reason.
@shubhamg9495
3 жыл бұрын
Also nice for visually challenged people (just in case) or if anyone is watching in low quality in poor data connection.
@alyoshadiaz4283
10 жыл бұрын
Thank u wish I had u as my science teacher!!
@abdullah374
4 жыл бұрын
Are u still using this account?
@dtdark212
13 жыл бұрын
This helped me for trigonometric graphs. couldnt thank you enough!
@DosHDable
7 жыл бұрын
Heard ''jerking up and down '' automatically came to check comments
@devindrarambo3293
7 жыл бұрын
same hahahaa
@sujeewa8067
5 жыл бұрын
dammit, same here man! :D
@laava1028
4 жыл бұрын
lmao same
@lykith7058
3 ай бұрын
Same here lol
@robindraramnarine6068
8 жыл бұрын
i have finals tomorrow an i didnt understand this until i watched your video thanks
@sukantpanigrahi76
7 жыл бұрын
How are you going to give a exam the next day after newly learning just the basic formulae for waves that you could read in a book? What grade are you in btw.
@sukantpanigrahi76
7 жыл бұрын
An*
@sukantpanigrahi76
7 жыл бұрын
oh. well glad to see you want to learn. work hard!
@d7mi4eve
6 жыл бұрын
dude i learnt a whole chapter hours before the midterm and i got 24/25 even though the test was extremely hard
@Tron1992
14 жыл бұрын
Sal, I think you're reading my mind! It is just the lesson I wanted you to upload!
@925LY
7 жыл бұрын
I wonder how many times Sal has said "Magenta" over the years
@debidattamishra8677
4 ай бұрын
A lot
@nadirmarikkar4335
8 жыл бұрын
I ALSO DIDN'T UNDERSTAND ANYTHING ABOUT WAVES UNTIL I WATCH PREVIOUS AND THIS VIDEOS .THANKS A LOT.....REALLY IT'S VERY HELPFUL.ONCE AGAIN THANK YOU VERY MUCH ..
@reemoo4kill
10 жыл бұрын
your videos motivate me to study! thanks :D
@cynthuquita
10 жыл бұрын
that's so true! i want to study hahaha
@danielaramirez676
4 жыл бұрын
digital learning days gang😗✌🏼
@bakumhaku6454
3 жыл бұрын
Hi
@dylanbrown4683
2 жыл бұрын
Sal is a truly talented instructor. I've learned so much from him!
@Raina430
12 жыл бұрын
I have been trying to grasp this all of my life. Always bad at math and science ( and I have been alive a longtime), you made this crystal clear. Thanks so much!
@agricolaterrae
14 жыл бұрын
Oddly, we just reached this lesson in my physics class. Amazing timing.
@athiyah1
11 жыл бұрын
14 years old up in Singapore, if your'e in a private school like mine (School of Science and Technology, Singapore). Most likely the mainstreaming academic schools learn this at the age of 15. May I remind you that Singaporeans only start learning physics at the age of 13. If your'e wondering what I learn for science before the age of 13, its just simple science foundations to help us cope in secondary school.
@soomindaroosianguy
7 ай бұрын
this is saving my life for my physics quiz on thursday; everybody should donate to this channel
@ad2181
14 жыл бұрын
Sal, Show what happens when the differential impluse (-+) wave reaches the end of the string, different reflection result, if the end of the string is floating (open) or locked down (shorted) . Keep posting, I'm enjoying.
@lychee159
13 жыл бұрын
love u Sal! tmrw is my physics test and now for the very first time i am over confident lol .
@JustAnotherFace
12 жыл бұрын
Dude, you are awesome! You explain things so logically and break subjects down in a way I can understand. Thanks!
@tjli5146
6 жыл бұрын
These videos helps a lot. Thanks!!
@azizahchesu3313
7 жыл бұрын
will be having the biggest physics examination in my high school this Tuesday and this video helps me a LOT. thankyouu!
@Hannah-jq9hh
7 жыл бұрын
Can you please do a video on phase change on reflection for light (Where there is a phase change of π on reflection at an interface where there is an increase in optical density, e.g. a higher refractive index such as light going from air to glass. There is no phase change on reflection where there is a decrease in optical density, e.g. a lower refractive index such as light going from glass to air) And explain why that is? Thank you:)
@NobleNayen
9 жыл бұрын
Love your videos, I owe you my degree :P
@nafisulislam4376
8 жыл бұрын
Always watch videos from this channel.......
@MalikisOnline
12 жыл бұрын
May you live long Sal ... I could not clear this concept thought out my life.
@matty2battie
12 жыл бұрын
Counting to 20 with Sal. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,19,20.
@blueli9ht101
5 жыл бұрын
finally after 6 years i know what is that mean ,, the first thing i will do when i get my first paid i will denote to this academy
@juliahill3912
8 жыл бұрын
Im in an advanced science class and my teacher told us that we have a test on this after 2 classes of him just giving us chapters to read from the textbook XD. Thanks for helping me understand and i will pass this on to my friends who are also having trouble ( the rest of my class ahah)
@SnuggieGuy
11 жыл бұрын
HOLY SHIT THANKYOU SOOO MUCH!!!, I'm kinda abit behind in my physics class and I need some help figuring out what lambda, velocity, frequency is and stuff thanks alot>
@kelliecliff5914
8 жыл бұрын
THANK YOU SO MUCH!! I have a science project on this and just couldnt understand frequency. This video got me to understand it!! I was so frustrated and freaking out cos i didnt understand! Now I am so much more relaxed!!
@ibbyizaG
12 жыл бұрын
Even though i didn't get any sleep last night, and don't plan to tonight, and even though im stressed like crazy about my AS Physics exam in two days, i still chuckled at 2:20 ^^
@HotPepperLala
14 жыл бұрын
You should actually do a video on standing waves, nodes, frequencies (or just pull out the topics from AP Physics B)
@Chaosflyex98
12 жыл бұрын
Khan, your vids are great.. they've helped me a ton. But why do you not win some sort of award?!
@matamax7342
3 жыл бұрын
These videos honestly make me wonder why I need school I could literally just learn everything from KZitem
@AmasaTony81947
3 жыл бұрын
I had the good fortune to have Richard Feynman as a teacher at Cal Poly. I also was taught by Sir Ronald Syme at Christchurch. The sheer presence of such scholars could never be equaled by a You Tube video. The atmosphere of deep respect for learning and the intellect can’t be matched by a video, nor can the camaraderie and sense of shared purpose. Finally I met my wife in graduate school.She was a distinguished scholar in the Classics dept. whose nickname (unknown to her) was the goddess. The You Tube community hath not her like!
@KevinTong1
2 жыл бұрын
@@AmasaTony81947 you are really ignorant to assume that every lecturer is as passionate as Richard Feynman and that everyone is as fortunate you are.
@AimzIIT
2 жыл бұрын
Literally , From my Bottom of Heart ❤️ Thank You Master Teacher ! This is one the Bestest Explaination I've got since 2 yrs !
@ChemKage
12 жыл бұрын
All waves are created by Sal and his string because he is god, Thankyou so much SalJesus
@LikkleBelleMusic
9 жыл бұрын
His videos are absolute gold He clarifies everything
@PartVIII
14 жыл бұрын
i am just wondering, could you please elaborate on how a wave can move in a vacuum without a medium? Sal does a fantastic job thoroughly covering the material, but his true forte is explaining abstract concepts.
@xGalasko
6 жыл бұрын
PartVIII it can't lol
@chrispierce1418
12 жыл бұрын
Holy crap! I actually understood everything that you said! And the good thing is you didn't bore me to death... A+
@Sitara04
14 жыл бұрын
could you please do more videos on electrostatics. more examples etc. and also trigonometry, the identities,radians etc
@Numh2030
14 жыл бұрын
im following every video on waves and optics :) pleasee keep goin
@shakarkhan
13 жыл бұрын
wow, this is one your best videos ever! thank you for such a clear explanation.
@ltran96
12 жыл бұрын
Sal, can we please get some Light waves and interference videos? Its really needed.
@dhiruiitk
2 жыл бұрын
Thank you! It was helpful.
@raptors551
14 жыл бұрын
great video sal, soooo helpful, hopefully itll be enought for my exam
@narendhankani5015
7 жыл бұрын
So so so much helpful Please continue making videos We are with u U re doing an awesome job
@andrewmiller3055
7 жыл бұрын
That was an awesome video. I have never understood frequency and hear it so often. The wave application is really cool.
@blueworld2740
10 жыл бұрын
Thanks now I'm ready for my test. Good job clearing it out for me.
@saimeghana2261
9 жыл бұрын
peak = crest, i guess.
@devindrarambo3293
7 жыл бұрын
yep could be either one that your accustomed to
@sukantaraut9269
6 жыл бұрын
Yes
@nourkandil7650
5 жыл бұрын
Yeah
@aubreymaryamacalde4279
4 жыл бұрын
Yess
@monsterjazzlicks
8 жыл бұрын
Because you deal with VELOCITY is this videos examples, should the equations not be solving for DISPLACEMENT rather than DISTANCE? And by the same token, include the DIRECTION of EAST in these cases please? Thanks.
@pulkitsinha3736
8 жыл бұрын
Displacement and distance...transverse waves, like light, travel in straight lines. And this video covers the basics. So no reflection. Just a straight line. And the velocity in reality is speed here but...people into physics tend to use velocity all the time.
@monsterjazzlicks
8 жыл бұрын
***** Thanks very much. I will be coming back to these videos in the early new year . . .
@brockroper1168
11 жыл бұрын
thanks mate. heaps of help
@farhanahmed5843
4 жыл бұрын
wow very good way to explain.
@DaytakTV
9 жыл бұрын
20 people are not meant for STEM.
@chucklesreadstoyou
13 жыл бұрын
So helpful, for some reason I never learned this s#*% in high school, now I'm caught up.
@misctutorials1468
8 жыл бұрын
"Maybe i'm doing it every two seconds"
@srsly4789
6 ай бұрын
💀👍
@NoRefundsXD
11 жыл бұрын
OMG, I understood this in class, but Khan Academy never fails to blow my mind even when I think I understand something.
@cvtavares10
13 жыл бұрын
great video... excellent way of explaining
@turtlespwnnoobs101
12 жыл бұрын
Thanks man got a physics test tomorrow, saved me.
@Unkoww18383
7 жыл бұрын
Lol I liked how you counted so fast to 20 In 12:18
@070.ravishashwathj.k.9
6 жыл бұрын
Guy Shapira hifi
@hernanarias13
5 жыл бұрын
it was hilarious
@handlethisnut
11 жыл бұрын
Really good video. Thanx it helps alot
@TheCalvinWu
9 жыл бұрын
thank you very much, it is really really help
@FrankieSwaggz
11 жыл бұрын
Thank you so much! Great Video!
@ehtishamkhan294
8 жыл бұрын
isnt the peak called a crest ?
@superdude9077
8 жыл бұрын
+Ehtisham Khan Same thing, different ways of saying it.
@theslasher6441
7 жыл бұрын
Ehtisham Khan American vs British
@myblurryfaceromance5146
8 жыл бұрын
this is actually the most helpful thing of my life thank you so much sal
@MIMZification
12 жыл бұрын
this was really helpful thank you
@faisalabdi9029
8 жыл бұрын
thanks
@gitarthasarmah3302
4 ай бұрын
Khan academy is the saviour❤
@asherif1000
12 жыл бұрын
Thanks Khan you made my life so much easier :) You should build your own school :-)
@schmiigle
13 жыл бұрын
'hopefully i found that helpful' did you say?? DAMN RIGHT i did, thats equivalent to 3 2hrs physics lessons!!
@marthashelton236
12 жыл бұрын
thankyou, have a science exam next week
@qazzyy
7 жыл бұрын
80% of the people watching have either an exam or test in the next few days
@btdpro752
6 жыл бұрын
Qaz if you have an exam or test use the notes you got from school your teachers gave you ways to study and also helped you comprehend in class
@annettemilburn4336
6 жыл бұрын
Tomorrow
@d7mi4eve
6 жыл бұрын
well.. not me
@jasonyu5508
6 жыл бұрын
Me 1 hour and 15 mins
@mintbrownieangelfish-6114
6 жыл бұрын
Well you're not wrong. I've got a test tomorrow. :)
@LipService
12 жыл бұрын
The only reason is to get a college certificate for evidence SUPER non-sensical...........I'm learning more from him than all my teachers combined.
@stevelawrie7087
6 жыл бұрын
excellent, thanks from a Dad!
@harryfung1304
3 жыл бұрын
2:15
@beep7634
3 жыл бұрын
fufufufu
@dro04yoo
13 жыл бұрын
thank you. thank you. thank you.
@skyeus3837
10 жыл бұрын
this video is very helpful..thanks man
@shubhamrajpurohit4736
11 жыл бұрын
awesome tutorials!!..clear explanation!! :)
@unclesoe7669
11 жыл бұрын
Thanks, Now I can do my work.
@MsGreenDayFan1995
12 жыл бұрын
This is quite good but I think your vids should go more into detail..my teacher always gives us really hard homework to do and what you explain in your videos is just not enough to solve them..and im still going to school..im really wondering how this - although the basics are well explained - can help university students...
@fikret8422
7 жыл бұрын
thank you that is absolutely logical
@snitox
10 жыл бұрын
The highest point is actually called a crest
@aeceallia
5 жыл бұрын
Ya, I also got confused there
@whiteeyedshadow8423
4 жыл бұрын
they are both the same thing, crest and peak
@MichaelBracewell
13 жыл бұрын
I wish I could like this video more than once.
@yousorooo
9 жыл бұрын
Question: If the horizontal axis is time, the period is the "distance" between two peaks, and wavelength is also the distance between two peaks, wouldn't period = wavelength?
@yousorooo
9 жыл бұрын
Ok I get it now. A wave can't be graphed with a 2D curve, it's a 3D surface _y(x,t) = Asin(ax + bt)_, and period is the distance between two peaks with fixed x and wavelength is the distance between two peaks with fixed t. At any fixed point on the wave with distance _x_ from the origin, the distance between two peaks on the t-y plane is the *period*. At any fixed time t, the distance between two peaks on the x-y plane is the *wavelength*. The two peaks are different.
@ruijiayang980
9 жыл бұрын
displacement means how far it has moved from the original position. consider the first peak as the original position,then the distance to the consecutive peak will be the displacement! @shilpa bhandari
@nathandrouillard2927
9 жыл бұрын
I really love your videos, thank you
@darrell5774
8 жыл бұрын
v good ......thankyou
@thisaccountnolongerfunctio3829
9 жыл бұрын
(y) awesome..................video.......!!!!!!! thanks :) a lot......
@sleepyxyz5
12 жыл бұрын
Thanks a nice brush up for my basics =)
@nourkandil7650
5 жыл бұрын
Really perfection 💘
@kevinparsley6806
5 жыл бұрын
thats where the peak to trough expression comes from in investing.. interesting.
@Hipsterjes
4 жыл бұрын
Corona Virus online school gang.
@sapnaagarwal3054
5 жыл бұрын
Thanks a lot
@hypnotistchicken
12 жыл бұрын
omg you are so much better than my my teacher
@siddheshbirajdar8623
6 жыл бұрын
Thankful
@Stmpnqueen
7 жыл бұрын
Thank you!!!
@pathanmatin996
7 жыл бұрын
Nice good information
@lifeasbrad3260
11 жыл бұрын
yo what program do you use to draw out the lectures ? also, thanks for the help.
@TristanCorbellari
8 жыл бұрын
Thanks so much, dude!
@dnmdogmusic3360
7 жыл бұрын
thank you!
@davidjeon4587
7 жыл бұрын
In this video he states that the period is 1 over the period he has the right idea but a better way to think about periods is the reciprocal method
Пікірлер: 303