This method is to compare the general motion of a rigid body with the force systems in space and the central axis equation of the force systems in space has been derived beforehand.
这个方法就是将刚体一般运动与空间一般力系进行类比，而一般力系的中心轴方程是巳知的。
Based on the orbit equation of particle motion in central force field, the stable property and close property of orbit were discussed.
在中心势场中粒子运动轨道方程的基础上，进一步讨论粒子轨道的闭合性、稳定性。
Based on the Poisson bracket and the discriminant of integral of motion, we prove the problem that the moment of momentum is the integral of motion when the mass point is affected by central force.
运用泊松括号，依据运动积分判别式，证明了质点受有心力作用时，其动量矩是运动积分的问题。
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