Power | Work and energy | Physics | Khan Academy
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- čas přidán 11. 09. 2024
- IIII haaaave the powerrrr! Power is the rate at which work is done. Created by David SantoPietro.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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loving this lowkey rap
@@farzanababurowena2613 4:15 @1.5 speed
This guy raps better than most of these wack rappers we have today
True, at first I thought he was kinda authoritative in his tone but then realized he's rapping :) . Great video anyway, very clear and concise.
you're like explaining an ancient mistery because of the tone of your voice and the background music..😂 whhaha😂😂
*mystery
the way he explained is amazing and VERY clear!. plus that back ground music= motivation :D
The background music is TERRIBLE tf u talkin bout?
Excellent explanation. He might be a Professor at high school or University to help students to love and get the physics.
More students scared of physics, because, in my opinion, teaching methods of some Professors are tough.
perfect animation, music and rap! It almost feels like a song
After watching ur video now i understand this chapter very easily...tq for ur great support😊😊😊
I was just missing sal........but this is amazing.... nice background music dude!!!!!
Great video, but do you even lift?
Adeel Ali do you?
czcams.com/video/OloLS5kTrVs/video.html
This is very helpful. I am a newbie science teacher and this video made it so easy for me to u nderstand, and I will be using your example in class. Thank you.
You have no idea how much i enjoyed this video.. I love physics!
Hey bro it's been 6 years I wonder how you doin ?
Loved the video. eveything was so clear and understood .thank you.
This helped a lot... thank you
Great! I really love the explanation!
Nice ...
But plz don't put any kind of music it distubs effective listening 😒
PLEASE LET US PRINT #now #igiveup #relateable #youherewhentheyloggedin #nevergonnagiveyouup #yeahboi
These are great videos, but the background music is far too distracting, so much that I can't focus on the content. That's too bad!
Youre right
Agreed a redo of the video would be great
I agree!
Even the music is amazing, this channel is awesome
Amazingly well explained. Thanks!
clearly explained, thank you!
@3:00 Is not instanteneous power similar to the uncertainty principle in quantum mechanic ? I mean, the smaller the distance, the less precise the speed is (because you can only measure the speed between these two points). But the smaller distance means you know precisely where the car is.
Greatest video on CZcams
Love it.
Thank you so much...for information about...power... I like your video
Thanks! I have a test tomorrow so this definitely helps
Sir plze use Hind language to explain that will help you to get more view..
are u a scumbag, he is an american and noone wants fukin' views for the sake of u hindi scums, just burn in hell assholes
@@cornationboot8690 incel detected
But i think avg power=half of instantaneous power, is it right
Amazing, clear, and well-enunciated tutorial, nice work man!
Double speed and the bgm sounds really good
EXACTLY!! {•~•}
You just solve my two lesson in Science so thank you
man this is one of my fav songs oh its not a song? YOUR WRONG ITS FIRE
Incredible video
u sound so insprational man...good video cleared alot of things for me...
Ibrahim Ali Asghar امريكي سكس امريكي ن**
سيكي ت
سيكي
يسكي
where is Khaaaan
Chandigarh
good video cleared alot of things for me,, very good explanation thanks
What is name of background music?
Juro Bebić that's what I am wondering
intresting
Thanks😉
thank you for the lesson
Energy & Power
Nice explaination sir ...
Clearly explained and well-put!🎉Amazing!
thanks a lot
Pls lower the music as it distracts me 😭
I really like how you explain :p
Thanks man
Some word are hard to understand for kids.
Rap my dude!
I know the video says both weight lifters are doing the same amount of work but I think this might actually be impossible. If we are talking about the same mass and distance, then the the lifter with more power will be doing more work. Force is mass x acceleration and work is force x distance, so more work will be done by the power lifter since his acceleration is greater.
I too was confused about this, but work in the case of lifting something against gravity is the total amount of energy used, yes work involves force times distance, but we are not using the force of the hand, but the energy required to hold it against gravity. To hold something (in this case) is to oppose gravity, cancelling it out means to apply an equal and opposite force. If the weights are at the same height and weigh the same, then to hold them up is to apply the same force that gravity is acting on them.
This is in sort of the same principle of how energy works, when you hold an object to a height, the potential energy of that object while it is resting there is the same amount of energy used to lift that object there in the first place. This is what the video started when saying the 2 people did the same amount of work, which just meant how it was transferring the same amount of energy from the person to the weights to achieve that potential energy at that same height. As he said in the video, work is equal to the amount of energy you give, or take away, in the case of the 2 people, they are both giving the same amount of energy to get that same gravitational potential energy.
Since your question was asking about the amount of force that was used, then yes, the initial force would be different from the hand to the weights, more force would be required to lift/push something the same distance but at a faster rate than not. However, since we are just lifting it and then stopping at the top, the force you exerted, whether big or small, travelling fast or slow has to be cancelled out with gravity to stop it there, so you would have to apply an opposite force to the weights to decelerate it to the same force of gravity for both scenarios, the net forces are equivalent. That is why we don't find the force of the hand useful for Work (in this case), the only force required is gravity, any other forces that are used that accelerate it faster will just be cancelled out in the end, so it doesn't matter since we are just stopping it at the top. If we didn't stop it, then the weights with more force will travel further and in return have more work done to it.
Great video!
Could somebody explain to me why constant power results in variable acceleration?
Good
Superb!
David almost sounds like MatPat. Dunno why.
OMG I THOUGHT I WAS THE ONLY ONE WHO THOUGHT THAT xD hahah
WriggleNB helloooo my fellow theorists
SAME BROOOOO
well explain 👍👍
Videos are great. I request that the music should be removed as it causes distraction.
wow understand in 6 minutes
waw❤️
THaNK YOU!!!!!!
But what if the mass was 1000kg . The amount of power in 3 seconds is greater than 1 second.
This was intense experiment on 2x speed, and not in terms of learning but in terms of music and vibe xD
pretty well explained but I prefer the way Sal explains things and I find the background music distracting and just unnecessary.
Watt watt watt watt... good one, Rishi.
Nice lesson but pls remove the background music.
this shit is genius
I am focusing on the music more than the video
very good explanation thanks
Where did he get the 9.8 from???
I was wondering too
That's the acceleration due to gravity
bro do F = GMm/r^2
all epic
Hmm..physics is interesting. :)
why is this on “medicine”?
Lodi salamat sa impormasyon
we are all light, electric energy
i need the link to that instrumental in the background pls!!! lol
Why did you have to put that music behind it?
Hi mga klasmeyt
any idea which music it is ?
nice bro
Were you trying to rap this?
Either way, good video
The avatars are so cute
For the first problem in calculating the work, why did you iclude 9.8 in the calculation????
Trudiii Murr that’s gravity
ohh. Thank You! :)
when he said 1st said wat i thought he said WAP
What about energy
I'm only here because of Corona XD
I still make jokes about it and it just hit a town VERY nearby
Watt is power??
why is it under medicine??
what is the background music?
Yodadada
1.5 speed really slaps
Am I in heaven?
the music is quite annoying
Silly , go and test the battery of the weightlifter in the real world. and you will probally find that if the same person is using less power his battery runs out quicker. Check the theory with the real world.
playback speed : x1.5
some nice rap for ya
your welcome ;)
I got one better: 2x and it’s still not enough
666
This video was a big f you to me
This dude is not as good as Sal
Hey are you feeling sleepy
name of the background music?