动量守恒定律是自然界最重要的最普遍的规律之一。应用它来解决力学中诸如碰撞、爆炸、打击和变质量物体的运动等方面的问题,往往较为简便。而且,在解决其他一些较为复杂的力学问题时,也不失其为一件重要工具。但是,不少学生在应用动量守恒定律解题时,常常比应用牛顿定律更容易发生错误。究其原因,笔者认为是对如下几个问题缺乏充分的认识。 The law of conservation of momentum is one of the most important and universal laws in nature. It is often easier to use it to solve problems in mechanics such as collisions, explosions, blows, and movements of variable mass objects. Moreover, it is also an important tool for solving some other complicated mechanical problems. However, many students are often more prone to errors than applying Newton’s law when applying the conservation law of momentum. The author believes that the lack of adequate understanding of the following issues.