碰撞中的动量守恒”是高中物理教材第三册中一个重要的学生实验，在实践中发现按教材中的装置图去做，存在着操作繁琐、误差大等缺点。究其原因，是因该装置用了一个用于放置被碰小球的支柱。若取消支柱而直接把被碰小球置于斜槽末端的水平段上，则上述问题可迎刃而解。如图１ “Conservation of momentum in collision” is an important student experiment in the third volume of high school physics textbooks. In practice, it is found that there are shortcomings such as cumbersome operation, large errors, etc. The reason is because The device uses a pillar for placing the impacted ball, and if the pillar is removed and the impacted ball is placed directly on the horizontal section at the end of the chute, the above problem can be solved.