This is the law of conservation of momentum. It is true for all collisions. Watch this video for a practical demonstration of conservation of momentum in elastic collisions.

Elastic and inelastic collisions are described. Students learn to state the law of conservation of momentum and define a closed, isolated system.

we differentiate between elastic and inelastic collisions. The conservation of momentum and the conservation of energy are explored as we do examples involving these two types of collisions.