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本文通过一典型例题讨论,指出对于二体系统的动能问题,可用质心等效法求解,但要注意用质心运动代替质点系的运动时,要考虑质点系相对于质心的动能.
In this paper, a typical example is discussed. It is pointed out that the kinetic energy of the two-body system can be solved by the centroid equivalent method. However, we should pay attention to the kinetic energy of the mass system relative to the mass center when replacing the mass-system motion with the mass-center motion.