You apply a torque here, it will start rotating.

And you can just assume that maybe it's sitting on a, you know the screen, this is kind of a frictionless surface, there's no air resistance.

If someone applied a torque to this mass, this mass could start And so this right over here would be its center of rotation, and so you could imagine And let's just say it's attached by, essentially a massless wire, to you know, it's just nailed down right over here. So let's imagine you have a mass, for the sake of this we're So now let's try to take a similar idea, but go into the rotational world. And we use that idea in all sorts of interesting physicsĪpplications in the world, and especially a lot ofĬases using billiard balls and whatever else. So if you don't have any impulse, especially if you don't have any net force acting on an object, its momentum is going to be constant. Time that we apply it for, force times time and And so the magnitude of our force times the duration of the The harder it's going to, 'the harder it is to stop it in some way.' And so we know if we wanna get a little bit more mathematical, that if we wanna change momentum, we have to apply forceįor some amount of time. Translationial momentum, and one way to think about it is, 'Well how hard is it to stop this thing?' Literally in everyday language you think, 'Well how much momentumĭoes something have? 'The more momentum this has This is all a review, we have other videos where we talk about Is defined as being equal to the mass times the velocity. Use the Greek letter rho to represent momentum. That velocity we say is v, we know that this object

If we have some mass, m, and it is moving with some velocity, let's say the magnitude of

Momentum iunit