平方反比律有心力场中的一种特殊恒矢量

A Special Constant Vector in the Gravitational Field of Square-Inverse Propertion Law

本文指出平方反比律有心力场中，除机械能Ｅ是恒量，角动量Ｌ是恒矢量外，还存在一种特殊的恒矢量，利用这个恒矢量，可以使处理一些有心力场中的问题十分简洁有力。

In this paper,it is pointed out that in the gravitational field of square-inverse propor-tion law,mechanical energy is a constant,and angular momentum a constant vector; besides,there exists a special kind of constant vector.It may be very simple and forceful to deal withsome problems in the gravitational field by employing this constant vector.