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通过绳连接两个或三个物体的连接体模型,是高中物理中常见的模型。笔者在教学中发现,一些教辅用书设置相关习题中,将连接体速度同时达到最大值作为隐含条件让学生进行求解,这显然是错误的,极易引起误导。下面以例进行剖析说明。题如图1示,质量相等的三个物体A、B、C用一根不可伸缩的轻绳通过两个定滑轮P、Q连接,定滑轮轴水平间
A connector model that connects two or three objects by rope is a common model in high school physics. The author found in teaching, some teaching supplementary book-related exercises, the connector speed reached the maximum at the same time as an implicit condition for students to solve, which is obviously wrong, easily misleading. The following example to analyze. As shown in Figure 1, the three objects of equal mass, A, B and C, are connected by two fixed pulleys P and Q with a non-retractable light rope. The horizontal axis of the fixed pulley shaft