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动量守恒问题，是研究物体系在不受外力或受合外力为零时，其内部各物体间发生相互作用，而引起它们之间的相对位移与速度变化的关系．在许多实际问题中，因各物体间的相互作用形式及其作用过程的不同，其结果也常不一样．许多初学者对此总缺乏足够的认识，加之又不能作详...
The issue of conservation of momentum is the relationship between the relative displacements and velocity changes of the research object system when they are not affected by external forces or external forces. In many practical problems, the results are often different due to the different forms of interaction and the different processes between objects. Many beginners do not know enough about this, plus they can’t elaborate...