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动量守恒定律是自然界普遍适用的基本规律之一,它的适用条件是很明确的,但应用它解决具体问题时,却往往出错,这是因为学生对其适用条件的本质的了解还不够明确。下面对动量守恒定律适用条件进一步分析和讨论。1动量守恒条件的确定1.1系统受到的合外力为零的情况(1)动量守恒的条件为什么用合外力为零,而不用合外力的
The law of conservation of momentum is one of the basic laws universally applicable in nature. Its application conditions are very clear. However, when it is applied to solve specific problems, mistakes often occur because students’ understanding of the nature of their application conditions is not clear enough. The following conditions for the conservation of momentum conservation conditions for further analysis and discussion. 1 Determination of conservation of momentum 1.1 The system is subjected to zero external force (1) the conditions of conservation of momentum Why the total external force is zero, without the use of external force