本文从①碰撞是否总满足动量守恒;②碰撞中的动量与能量的变化;③碰撞时系统的合理选取;④碰撞的综合问题等四个方面,比较系统地剖析.对学生透彻理解碰撞问题有一定的指导意义. Whether the 1 collision always meets the conservation of momentum; 2 the change of momentum and energy in the collision; 3 the reasonable selection of the system during the collision; 4 the comprehensive problem of the collision, etc., is analyzed systematically. The students have a thorough understanding of the collision problem. Certain guidance significance.