Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Momentum The momentum of a moving object is found by multiplying its mass by  Its velocity. This makes the unit of  momentum Kgm/s. (Kilograms x  Metres per second)    Play the animations In a collision, momentum is conserved. Momentum  before the collision is the  same as momentum after the  collision. The first animation Shows two balls of the same  mass colliding. In this collision the first  Ball is half the mass of the  second. In this collision both balls stick together and move off together Collisions Explosion situation to the left to the right