Rotational version of Newton's second law | Physics | Khan Academy
In this video David explains moment of inertia and the rotational version of Newton's second law and shows how to solve an example problem.
Watch the next lesson: www.khanacademy.org/science/p...
Missed the previous lesson? www.khanacademy.org/science/p...
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.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Physics channel: / channel
Subscribe to Khan Academy: kzread.info_...
Пікірлер: 32
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!!..
I have been stuck on physics for a week and this video made it just click. Thank you so much.
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
6 жыл бұрын
I'm going to show this to everyone I know, this needs attention
thank you, nice explanation, i understood
Thanks a lot!
Thankyou!
i like this problem, thx sir!
Really thank you ❤️
The bomb, thx
Thankyou so much, sir
Thank u bro
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
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.
No one ,literally no has explained why is it I = mr² 😭😭😭thanks a lot
7:50 don't forget that the string connecting the mass to the point has no mass😁
Thanks =]
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
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?
what if you don't have the masses and want to find inertia
❤❤❤❤❤❤
Thank you so much!
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
6:09
Imagine having time to dislike education videos
big whoop
Bad video from pedagogical point of view. Many places have "explanation gap". Author presumes that something is obvious (but not). Hard dislike.
Thanks a lot!