正确理解功的定义

Correctly understand the definition of work

文章分析了功的3种定义本质上是一致的,关键在于如何理解力的作用点。一个物体可以看作刚体可以认为是质点的必要条件,耗散力做功不能按照质点问题处理。

The article analyzes that the three definitions of work are essentially the same, and the key lies in how to understand the point of action of force. An object can be regarded as a rigid body and it can be considered as a necessary condition for a mass point, and the work done by dissipative force cannot be dealt with according to the mass point problem.