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在学习牛顿定律、动量、机械能这三章时,对每章的练习学生会套用牛顿第二定律、动量定理、动能定理来解.但当力学部分复习结束时,遇到力学综合题,就有一部分学生不知道到底该用什么规律来解题.笔者最近几年每当力学复习结束时,专门用一节课再把牛顿第二定律、动能定理和动量定理比较一下,并对照例题分析让学生真正知道在哪些情况下用哪个公式解题最简洁,收到了理想的效果.下面就通过对一个习题的多种解法谈谈如何使用恰当的规律来简洁地解力学综合题.
When learning Newton’s law, momentum, and mechanical energy, the students in each chapter practice Newton’s second law, theorem of momentum, and kinetic energy theorem. However, when the review of mechanics is over, when it comes to mechanical synthesis, there is a part of it. Students do not know what laws should be used to solve the problem. In the last few years, when the review of mechanics ended, the author used a lesson to compare Newton’s second law, kinetic energy theorem, and momentum theorem. Knowing which formula to solve the problem in which cases is the most concise, and has received the ideal effect. The following is a simple solution to the problem of comprehensive mechanics by talking about how to use appropriate laws for multiple solutions to a problem.