动量守恒问题,是研究物体系在不受外力或受合外力为零时,其内部各物体之间发生相互作用,从而引起它们之间的相对位移与速度变化的关系.动量守恒定律是解决这类动力学问题的重要依据.动量守恒定律不仅适用于宏观物体的低速运动,也适用于微观现象和高速运动,应用十分广泛. The issue of conservation of momentum is that the research object system interacts with each other within the object when it is not affected by external force or external forces. This results in the relationship between the relative displacement and the velocity change. The law of conservation of momentum is to solve this problem. The important basis of the class dynamics problem is that the law of conservation of momentum not only applies to the low-speed motion of macroscopic objects, but also applies to microscopic phenomena and high-speed motion. It is widely used.