Collisions

Question

請以中文解釋下述三項碰撞，並提供例子。（有圖更好）
elastic collision
inelastic collision
completely inelastic collision

Answer 1

elastic collision: collision in which there is no loss of kinetic energy of the system.

inelastic collision: collision in which there is loss of kinetic energy of the system.

perfectly inelastic collision: process in which the collided objects stick together after the collision.

Note that in all three collision processes, momentum of the system is always conserved.