Rotational version of Newton's second law | Physics | Khan Academy
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8 жыл бұрынIn this video David explains moment of inertia and the rotational version of Newton's second law and shows how to solve an example problem.
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@ptyptypty3 6 жыл бұрын
this video is by far the best I've seen on this subject!!.. Thank YOU!!.. I wondered how the Radius, R, was used as R^2 in the I= mR^2.. and YOU showed me!!!.. Great video!!..
@ryanlang2921 5 жыл бұрын
I have been stuck on physics for a week and this video made it just click. Thank you so much.
@looksintolasers 6 жыл бұрын
This needs to be retagged! Searching for "Moment of inertia" and "rotational inertia" showed nothing! 70 views! That's criminal!
@looksintolasers 6 жыл бұрын
Also, congrats on finding out how to be a physics teacher without the grading :D
@yw5617 5 жыл бұрын
I'm going to show this to everyone I know, this needs attention
@AliVeli-gr4fb 7 жыл бұрын
thank you, nice explanation, i understood
@JimmyChungmusic 7 жыл бұрын
Thanks a lot!
@trenetae 2 жыл бұрын
i like this problem, thx sir!
@Akens888 5 жыл бұрын
Thankyou!
@hrn8935 2 жыл бұрын
To anyone who is wondering how to compute rotational inertia of complex systems lets say a cilindir and the axis was the geomteric center you integrate it with the limits being the ennds of a cylandir and the function relating how a tiny change in radius gives you a tiny change in mass
@VincentDuxD 4 жыл бұрын
The bomb, thx
@doniaabdelmigeed2250 3 жыл бұрын
Really thank you ❤️
@Mango_9934 Ай бұрын
Thank u bro
@AlaizaF 3 жыл бұрын
Thankyou so much, sir
@kattamanasa1254 3 жыл бұрын
No one ,literally no has explained why is it I = mr² 😭😭😭thanks a lot
@fur1us556 4 жыл бұрын
7:50 don't forget that the string connecting the mass to the point has no mass😁
@Szhihihihihihi 2 ай бұрын
Thanks =]
@maze._ 4 жыл бұрын
6:37 What's an example where we can feel or intuitively understand that increasing the radius makes it harder to angularly accelerate an object? I'm having trouble grokking that.
@j_blue6784 3 жыл бұрын
it's been a year but i'll try to answer Imagine you have two barbells that weigh the same but are different lengths (Illustration: O---O O----------------------O ). If you spin them (axis through center of mass and perpendicular to the rod) you'll notice that the shorter one is a lot easier to spin compared to the longer one. That's cause the weights are on average much further apart from the rotational axis on the longer one. Also, if you span both of them at the same time with similar angular momentum, the longer one's weights will move much faster, which shows that the longer one has stored more kinetic energy.
@hrn8935 2 жыл бұрын
Why does the t in troque look so weird im not sure if its you handwriting or the notation but it puts me off other than that great video
@bananastuff2840 4 жыл бұрын
But when I try to push a door, it's easier to push at the further end from the axis than near the axis. What's happening here?
@mayalopez4008 4 жыл бұрын
what if you don't have the masses and want to find inertia
@user-qg3ij8ts7e 7 ай бұрын
❤❤❤❤❤❤
@demaromavrazeb3111 2 жыл бұрын
Thank you so much!
@LorenzoB16 7 жыл бұрын
6:09
@camid7403 4 жыл бұрын
why wasnt mass 3 torque calculated?
@abdullahumuthamzaogullar3315 3 жыл бұрын
Torque is just perpendicular force times distance. There was no force on mass 3, you could say 0*3 for its torque.
@bilalali7800 2 жыл бұрын
@@abdullahumuthamzaogullar3315 Shouldn't the torque be considered as it has mass, so the force would be F=mg and then the torque would be 1*30N
@Ivan-pp8ib 3 жыл бұрын
Imagine having time to dislike education videos
@andrewagita901 4 жыл бұрын
big whoop
@cenaalan5825 9 ай бұрын
Bad video from pedagogical point of view. Many places have "explanation gap". Author presumes that something is obvious (but not). Hard dislike.
@derjemand1021 2 жыл бұрын
Thanks a lot!
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