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动能定理是可以通过牛顿定律推导出来的,原则上讲用动能定理能解决的物理问题都可以用牛顿定律解决,但是在处理动力学问题时,如果利用牛顿定律求解则必须求出加速度,如果有多个过程,则求解过程将是相当繁琐的。但是如果利用动能定理求解就比较简单。因为利用动能定理解题不但简便,而且能很好地考查学生的思维能力,所以特别受命题人的青睐。下面就动能定理的应用作一个简单的分析。
The kinetic energy theorem can be deduced by Newton’s law. In principle, all the physical problems that can be solved by the kinetic energy theorem can be solved by Newton’s law. However, when dealing with the dynamics problem, if Newton’s law is used, then the acceleration must be obtained. Multiple processes, then the solution process will be quite tedious. But if you use the kinetic energy theorem to solve is relatively simple. Because the use of kinetic energy theorem problem-solving is not only simple, but also a good examination of the thinking ability of students, so particularly favored by the proponents. The following application of kinetic energy theory for a simple analysis.