关键词: 钢球, 对心完全弹性碰撞, 动量守恒, 能量守恒

Abstract: Elastic right collision experiments motion states of the two balls before and after a of a steel ball and a bigger one are made, which show that the collision are discrete and only four different values, and collision makes their state jump from one value to another in circles.

Key words: steel balls, elastic right collision, conservation of linear momentum, conservation of mechanical energy