物体受力分析是研究质点动力学问题的关键。
本文在分析了约束的普遍特性的基础上，讨论了“约束释放原理”在研究非自由质点系统动力学问题中的作用和局限性；
On the basis of analysing the general characteristics of bind this paper discusses the effect and limitation of "release principle of bind" in studying the dynamics of non-free particle system.
物体受力分析是研究质点动力学问题的关键。本文结合剖析六个例题，给出两条检查和判断物体受力分析正确与否的规则。
Force analysis is a key problem in particle dynamics. In this paper, Sir Examples are discussed and criteria are given for the correctness of force analysis.
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