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全日制普通高级中学教科书《物理》(必修)第一册,《牛顿第二定律》一节,是通过演示实验来探索加速度与力、质量的关系的。笔者在教学过程中,对教科书上的实验装置进行了认真的研究和分析,认为书中实验较理想化,实际操作的可行性差,学生不便于观察,测量小车运动的位移较费时。如图1-(a),1-(b)所示,是教科书中研究牛顿第二定律的实验装置。从图1-(b)可知,小车尾部的绳子在夹子口处有一个拐点,小车开始运动后,尾部的两根绳子
The first full-time regular high school textbook “Physics” (required), Volume 1, “Newton’s Second Law,” is a demonstration experiment to explore the relationship between acceleration and force and quality. In the course of teaching, the author carried out serious research and analysis on the experimental device on the textbook, and believed that the experiment in the book is more ideal, the practical operation is not feasible, the student is not convenient to observe, and measuring the displacement of the car movement is time-consuming. As shown in Fig. 1-(a), 1-(b), it is an experimental device for studying Newton’s second law in textbooks. As can be seen from Fig. 1-(b), the rope at the tail of the car has an inflection point at the mouth of the clip. After the car starts to move, the two ropes at the tail end