@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
@jimmyti9cer12 жыл бұрын
I love how he repeats stuff as he writes it. I dont know why but it helps for some reason.
@shubhamg94953 жыл бұрын
Also nice for visually challenged people (just in case) or if anyone is watching in low quality in poor data connection.
@DosHDable7 жыл бұрын
Heard ''jerking up and down '' automatically came to check comments
@devindrarambo32937 жыл бұрын
same hahahaa
@sujeewa80675 жыл бұрын
dammit, same here man! :D
@laava10284 жыл бұрын
lmao same
@lykith7058Ай бұрын
Same here lol
@alyoshadiaz428310 жыл бұрын
Thank u wish I had u as my science teacher!!
@abdullah3744 жыл бұрын
Are u still using this account?
@925LY7 жыл бұрын
I wonder how many times Sal has said "Magenta" over the years
@debidattamishra86773 ай бұрын
A lot
@robindraramnarine60688 жыл бұрын
i have finals tomorrow an i didnt understand this until i watched your video thanks
@sukantpanigrahi767 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.
@sukantpanigrahi767 жыл бұрын
An*
@sukantpanigrahi767 жыл бұрын
oh. well glad to see you want to learn. work hard!
@d7mi4eve6 жыл бұрын
dude i learnt a whole chapter hours before the midterm and i got 24/25 even though the test was extremely hard
@danielaramirez6764 жыл бұрын
digital learning days gang😗✌🏼
@bakumhaku64543 жыл бұрын
Hi
@dtdark21212 жыл бұрын
This helped me for trigonometric graphs. couldnt thank you enough!
@Tron199214 жыл бұрын
Sal, I think you're reading my mind! It is just the lesson I wanted you to upload!
@qazzyy7 жыл бұрын
80% of the people watching have either an exam or test in the next few days
@btdpro7526 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
@annettemilburn43366 жыл бұрын
Tomorrow
@d7mi4eve6 жыл бұрын
well.. not me
@jasonyu55086 жыл бұрын
Me 1 hour and 15 mins
@mintbrownieangelfish-61146 жыл бұрын
Well you're not wrong. I've got a test tomorrow. :)
@NobleNayen9 жыл бұрын
Love your videos, I owe you my degree :P
@dylanbrown46832 жыл бұрын
Sal is a truly talented instructor. I've learned so much from him!
@Hipsterjes4 жыл бұрын
Corona Virus online school gang.
@Raina43012 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!
@agricolaterrae14 жыл бұрын
Oddly, we just reached this lesson in my physics class. Amazing timing.
@reemoo4kill10 жыл бұрын
your videos motivate me to study! thanks :D
@cynthuquita10 жыл бұрын
that's so true! i want to study hahaha
@soomindaroosianguy6 ай бұрын
this is saving my life for my physics quiz on thursday; everybody should donate to this channel
@nadirmarikkar43358 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 ..
@matamax73423 жыл бұрын
These videos honestly make me wonder why I need school I could literally just learn everything from KZbin
@AmasaTony819472 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!
@KevinTong12 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.
@athiyah111 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.
@blueli9ht1015 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
@misctutorials14687 жыл бұрын
"Maybe i'm doing it every two seconds"
@srsly47895 ай бұрын
💀👍
@lychee15913 жыл бұрын
love u Sal! tmrw is my physics test and now for the very first time i am over confident lol .
@JustAnotherFace12 жыл бұрын
Dude, you are awesome! You explain things so logically and break subjects down in a way I can understand. Thanks!
@nafisulislam43768 жыл бұрын
Always watch videos from this channel.......
@azizahchesu33137 жыл бұрын
will be having the biggest physics examination in my high school this Tuesday and this video helps me a LOT. thankyouu!
@saimeghana22619 жыл бұрын
peak = crest, i guess.
@devindrarambo32937 жыл бұрын
yep could be either one that your accustomed to
@sukantaraut92696 жыл бұрын
Yes
@nourkandil76505 жыл бұрын
Yeah
@aubreymaryamacalde42794 жыл бұрын
Yess
@Unkoww183837 жыл бұрын
Lol I liked how you counted so fast to 20 In 12:18
@070.ravishashwathj.k.96 жыл бұрын
Guy Shapira hifi
@hernanarias135 жыл бұрын
it was hilarious
@tjli51466 жыл бұрын
These videos helps a lot. Thanks!!
@juliahill39128 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)
@kelliecliff59148 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!!
@Hannah-jq9hh7 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:)
@AimzIIT2 жыл бұрын
Literally , From my Bottom of Heart ❤️ Thank You Master Teacher ! This is one the Bestest Explaination I've got since 2 yrs !
@ad218114 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.
@ballsolove10 жыл бұрын
Excellent job breaking this down! Thank you!!
@MalikisOnline12 жыл бұрын
May you live long Sal ... I could not clear this concept thought out my life.
@Belle-wi1pr9 жыл бұрын
His videos are absolute gold He clarifies everything
@matty2battie12 жыл бұрын
Counting to 20 with Sal. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,19,20.
@ibbyizaG12 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 ^^
@DaytakTV9 жыл бұрын
20 people are not meant for STEM.
@andrewmiller30557 жыл бұрын
That was an awesome video. I have never understood frequency and hear it so often. The wave application is really cool.
@blueworld274010 жыл бұрын
Thanks now I'm ready for my test. Good job clearing it out for me.
@SnuggieGuy11 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>
@monsterjazzlicks8 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.
@pulkitsinha37367 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.
@monsterjazzlicks7 жыл бұрын
***** Thanks very much. I will be coming back to these videos in the early new year . . .
@HotPepperLala14 жыл бұрын
You should actually do a video on standing waves, nodes, frequencies (or just pull out the topics from AP Physics B)
@shakarkhan13 жыл бұрын
wow, this is one your best videos ever! thank you for such a clear explanation.
@snitox10 жыл бұрын
The highest point is actually called a crest
@aeceallia5 жыл бұрын
Ya, I also got confused there
@whiteeyedshadow84234 жыл бұрын
they are both the same thing, crest and peak
@Chaosflyex9812 жыл бұрын
Khan, your vids are great.. they've helped me a ton. But why do you not win some sort of award?!
@dhiruiitk2 жыл бұрын
Thank you! It was helpful.
@chrispierce141812 жыл бұрын
Holy crap! I actually understood everything that you said! And the good thing is you didn't bore me to death... A+
@ChemKage12 жыл бұрын
All waves are created by Sal and his string because he is god, Thankyou so much SalJesus
@raptors55114 жыл бұрын
great video sal, soooo helpful, hopefully itll be enought for my exam
@PartVIII14 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.
@xGalasko6 жыл бұрын
PartVIII it can't lol
@NoRefundsXD11 жыл бұрын
OMG, I understood this in class, but Khan Academy never fails to blow my mind even when I think I understand something.
@myblurryfaceromance51468 жыл бұрын
this is actually the most helpful thing of my life thank you so much sal
@narendhankani50157 жыл бұрын
So so so much helpful Please continue making videos We are with u U re doing an awesome job
@thomasmcdonnell19578 жыл бұрын
My physics teacher calls a periodic wave a transversal wave
you should watch his first video in the introduction to waves he talks about transverse/longitudinal (this comment was from 3 years ago but this might help others)
@ehtishamkhan2948 жыл бұрын
isnt the peak called a crest ?
@superdude90778 жыл бұрын
+Ehtisham Khan Same thing, different ways of saying it.
@theslasher64417 жыл бұрын
Ehtisham Khan American vs British
@Sitara0414 жыл бұрын
could you please do more videos on electrostatics. more examples etc. and also trigonometry, the identities,radians etc
@brockroper116811 жыл бұрын
thanks mate. heaps of help
@Numh203014 жыл бұрын
im following every video on waves and optics :) pleasee keep goin
@gitarthasarmah33022 ай бұрын
Khan academy is the saviour❤
@skyeus383710 жыл бұрын
this video is very helpful..thanks man
@ltran9612 жыл бұрын
Sal, can we please get some Light waves and interference videos? Its really needed.
@farhanahmed58434 жыл бұрын
wow very good way to explain.
@stevelawrie70876 жыл бұрын
excellent, thanks from a Dad!
@chucklesreadstoyou13 жыл бұрын
So helpful, for some reason I never learned this s#*% in high school, now I'm caught up.
@turtlespwnnoobs10112 жыл бұрын
Thanks man got a physics test tomorrow, saved me.
@schmiigle13 жыл бұрын
'hopefully i found that helpful' did you say?? DAMN RIGHT i did, thats equivalent to 3 2hrs physics lessons!!
@TheCalvinWu9 жыл бұрын
thank you very much, it is really really help
@cvtavares1012 жыл бұрын
great video... excellent way of explaining
@FrankieSwaggz11 жыл бұрын
Thank you so much! Great Video!
@LipService12 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.
@shubhamrajpurohit473611 жыл бұрын
awesome tutorials!!..clear explanation!! :)
@handlethisnut11 жыл бұрын
Really good video. Thanx it helps alot
@marthashelton23612 жыл бұрын
thankyou, have a science exam next week
@MIMZification12 жыл бұрын
this was really helpful thank you
@MichaelBracewell13 жыл бұрын
I wish I could like this video more than once.
@lifeasbrad326011 жыл бұрын
yo what program do you use to draw out the lectures ? also, thanks for the help.
@hypnotistchicken12 жыл бұрын
omg you are so much better than my my teacher
@asherif100012 жыл бұрын
Thanks Khan you made my life so much easier :) You should build your own school :-)
@unclesoe766911 жыл бұрын
Thanks, Now I can do my work.
@yousorooo9 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?
@yousorooo9 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.
@sleepyxyz512 жыл бұрын
Thanks a nice brush up for my basics =)
@fikret84227 жыл бұрын
thank you that is absolutely logical
@nathandrouillard29279 жыл бұрын
I really love your videos, thank you
@darrell57748 жыл бұрын
v good ......thankyou
@harryfung13043 жыл бұрын
2:15
@beep76343 жыл бұрын
fufufufu
@kevinparsley68065 жыл бұрын
thats where the peak to trough expression comes from in investing.. interesting.
@dro04yoo13 жыл бұрын
thank you. thank you. thank you.
@nourkandil76505 жыл бұрын
Really perfection 💘
@TristanCorbellari8 жыл бұрын
Thanks so much, dude!
@faisalabdi90298 жыл бұрын
thanks
@davidjeon45877 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
@Stmpnqueen7 жыл бұрын
Thank you!!!
@MsGreenDayFan199512 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...
@siddheshbirajdar86236 жыл бұрын
Thankful
@ruijiayang9809 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