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。
A theorem on kinetic energy for variable mass-point and formula of work of recoil internal forces are given and the reason of soft-rope query is discussed.
给出变质量质点的动能定理和一对反推内力作功的表达式，并由此给出软绳问题的正确解释。
A theorem on kinetic energy for variable mass-point and formula of work of recoil internal forces are given and the reason of soft-rope query is discussed.
给出变质量质点的动能定理和一对反推内力作功的表达式，并由此给出软绳问题的正确解释。
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