Question 5: What is a head-on collision? Explain with an example.
Those collisions in which the colliding bodies move along a straight line before and after the collision is called head-on collisions.
Head-on collisions are also called collisions in one dimension.
Head-on collisions may be elastic or inelastic. In the elastic head-on collisions, both momentum and energy remains constant. In inelastic collisions, only momentum is conserved; some energy may be lost as sound, heat etc.
Consider a ball dropped from some height ‘h’. The ball collides with a smooth marble floor and bounces back to the same height along the same line. This is an example of head-on collision.