求解质心运动守恒问题的相对坐标法

The Method of Relative Coordinate System to Settle the Conservation Problems of Center of Mass

对于质心运动守恒问题，理论力学教材中一般用绝对坐标法进行计算。本文提出了一种用相对坐标法求解的计算公式，并举例对用绝对坐标法和相对坐标法解题进行了比较。

As to the conservation of motion of center of mass, the method of absolute coordinate system is generally used in the teaching meterials of theoretic mechanics. But here the author puts forward a new calcutation formula using relative coordinate system and gives examples to compare the using of these two methods, thus shows us the convenience of the method of relative coordinate system