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系统不受外力或所受外力的合力为零 ,这个系统的动量就保持不变 ,这个结论叫做动量守恒定律 .在中学物理中通常只讨论由两个物体组成的系统 ,则动量守恒定律表示为 :m1V1+m2 V2 =m1V1′+m2 V2 ′ ( 1 )动量守恒定律是物理学的基本定律之一 ,用它来解决一些变力问题 ,如打击、碰
The system is not subject to external force or external force together to zero, the momentum of the system remains unchanged, the conclusion is called the law of conservation of momentum in high school physics is usually only discussed by a system of two objects, the law of conservation of momentum expressed as : m1V1 + m2 V2 = m1V1 ’+ m2 V2’ (1) The law of conservation of momentum is one of the basic laws of physics, and it is used to solve some variable problems such as striking, touching