![]() We know that the change of momentum is just the impulse, and we know that the impulse is given by: When the balls collide they change momentum. However I think it's useful to consider a collision, perhaps between two billiard balls. It's hard to think of a physical system involving a force that acted for zero time. Therefore also in a collision there is a push on a ball, exactly the same as here: there is a push on the book that tends to change its motion. In other words, a force can cause an object with mass toĬhange its velocity (which includes to begin moving from a state of But, also when the book falls to the ground because of gravity there is a change of momentum, why is that not impulse? That is the elusive difference, for me.įorce is not defined over a billion years, but:Ī force is any interaction which tends to change the motion of an.If I got it right, you are saying that we must consider it impulse when $t=0$?, else it is force. Gravitational force deliverting a non-zero impulse in zero time. I'm not sure it's helpful to think about the gravitational force,īecause I can't see a similar physical system where we can imagine the Isn't always a force actually an impulse?.Why if the same (short) time happens in a collision we call it an impulse?. ![]()
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