One possible experiment to demonstrate the law of conservation of momentum is to set up two billiard balls of different masses on a level surface. Place them in contact with each other, and then apply a force to one ball, causing it to move. Measure the initial velocity of the moving ball and the final velocity of both balls after the collision. By comparing the initial and final momenta of the system, it can be observed that the total momentum remains constant. This confirms the law of conservation of momentum.
