牛顿第二定律是力学中非常突出的一个重要规律,也是高考的一个重点内容。关于牛顿第二定律的应用,就研究对象的选择而言有整体分析法和隔离体法两种方法,且学生普遍认为:当连接体中各物体的运动情况相同时可用整体法分析,且往往会使问题的分析得到简化。但若系统内各物体的运动情况互不相同时,就必须采用隔离体法。这是一种误解。笔者 Newton’s second law is an important discipline that is very prominent in mechanics and is also a key content of the college entrance examination. On the application of the second law of Newton, in terms of the choice of the research object, there are two methods: the whole analysis method and the isolation method. Students generally think that when the movement of the objects in the connection structure is the same, The problem analysis will be simplified. However, if the movement of objects within the system are different from each other, you must use the spacer method. This is a misunderstanding. author