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我在进行动量第一章的复习时,曾经通过一道力学习题将动量此章的内容全部复习。检查了学生对本章概念的物理意义、规律的来龙去脉和适用条件理解、掌握的程度,提高了学生用能量和动置观点分析问题、解决问题的能力。下面是我编写的这道力学习题,供同行批评指正。如图1所示,在光滑的水平面上静止着质量为 M 的长条形物体,M 的左端有一质量为 m、初速度为 v_(?)的物体,在 M 上滑动。已知,m 和 M 之间的滑动摩擦系数为μ。
When I was conducting the review of the first chapter of momentum, I had reviewed the contents of the momentum chapter by reviewing all the questions. The students’ physical significance of the concept of this chapter, the ins and outs of the rules and the understanding of the applicable conditions, and the degree of mastery were examined, and students’ ability to analyze problems and solve problems using energy and dynamic viewpoints was improved. The following is a power study question I wrote for peer criticism. As shown in Fig. 1, on a smooth horizontal surface, a long object with a mass of M is stationary. At the left end of M, there is an object with mass m and initial velocity v_(?), and it slides on M. It is known that the coefficient of sliding friction between m and M is μ.