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1引言若质点系不受质点系以外其他物体的作用,该质点系动量守恒,这就是质点系的动量守恒定律,用公式表述,即p=∑pi=∑mivi=恒矢量.(1)在碰撞现象中,相互作用的时间很短,相互作用力先急剧增大,然后急剧减小,平均作用力很大.把相互碰撞的
1 INTRODUCTION If the mass point is not affected by other objects than the mass point, the mass point is the conservation of momentum, which is the law of conservation of momentum of the mass point system and is expressed by the formula: p = Σpi = Σmivi = constant vector. (1) Collision phenomenon, the interaction time is very short, the interaction force increased sharply, and then decreased sharply, the average force is great.