v m x y z s + 质点系的动量 质点系的动量（Momentum of particle System） 质点系内各质点动量的矢量和，记作： i i i v m p p 设各质点的质量为常数，用矢径表示速度，则 ...
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碰撞时质点系动量的改变等于作用在质点系上所有外碰撞冲量的矢量和。
The change in the momentum of a system of particles during an impact is equal to the vector sum of all the external impulses acting on the system.
采用简捷的方法推导质点系相对于任意动点的动量矩定理，并由此引出质点系相对于质心的动量矩定理和质点系相对于速度瞬心的动量矩定理。
There from it is used to obtain the principles of the angular of momentum of the system of particles with respect to its cenier of mass and instantaneous center of velocity.
讨论了质点系相对于任意点的动量矩定理的一般表达式及该定理在刚体平面运动中的应用。
The general expression of the moment of momentum of particles relative to an arbitrary point is discussed including application of the theorem of the plane movement in rigid body .
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