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连接体问题是学生学习中认为困难的问题。主要是因为研究的对象不是单一物体,而是两个或多个物体,其次是因为学生不会很准确地对研究对象进行受力分析,还有就是因为学生不能准确应用牛顿第二定律列出相应表达式。接下来笔者想通过几个案例的分析,来与大家共同探讨解决连接体问题的关键。【案例1】在一个光滑的水平面上有质量分别为m A和m B的两个物体用一根轻绳连接,在拉力F的作用下一起向前做匀加速运动,求:A、B两物体一起向前运动的加速度及轻绳上拉力的大小。
The connector problem is a problem that students find difficult. Mainly because the object of the study is not a single object, but two or more objects, and secondly because the student does not analyze the force of the subject accurately, and because the student can not accurately apply the Newton’s second law The corresponding expression. Then I want to pass several cases of analysis, to discuss with everyone the key to solve the problem of connectors. 【Case 1】 On a smooth horizontal surface, two objects of mass m A and m B are connected by a light rope and move forward together under the action of pulling force F to make uniform acceleration. Seeking: A, B The acceleration of the object moving forward together with the size of the pull on the light rope.