In physics, collision means the action of bodies striking or coming together (touch). Dynamics happens when an object hits a plane surface]]Collisions involve forces (there is a change in velocity). Collisions can be elastic, meaning they conserve energy and momentum, inelastic, meaning they conserve momentum but not energy, or totally inelastic (or plastic), meaning they conserve momentum and the two objects stick together. The magnitude of the velocity difference at impact is called the closing speed. The field of dynamics is concerned with moving and colliding objects. Billiards In billiards, collisions play an important role. Because the collisions between billiard balls are nearly elastic, and the balls roll on a surface that produces low-rolling friction, their behaviour is often used to illustrate Newton's laws of motion. Traffic In traffic such a

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