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滑轮组问题是中学物理重点知识,也是中考的必考点.涉及滑轮组机械效率的计算时学生最易出错,通过本文掌握滑轮组的基本公式和解题方法,滑轮组的问题便可轻松解决.一、实验装置图1是测量滑轮组机械效率的实验装置:二、考点聚焦1.实验器材及安装(1)“奇动偶定”:与动滑轮相连的绳子股数为奇数时,绳子的起始端在动滑轮上;反之,绳子的起始端在定滑轮上.
The problem of the pulley block is the key knowledge of the middle school physics and also a necessary test for the middle school entrance examinations.As to the mechanical efficiency calculation of the pulley block, students are most likely to make mistakes. By mastering the basic formulas and solving methods of the block, the problem of the block can be easily solved. Figure 1 is an experimental device for measuring the mechanical efficiency of the pulley block: Test point focusing 1. Experimental equipment and installation (1) “Odd and Even”: when the number of ropes connected with the movable pulley is odd, the beginning of the rope is on the movable pulley On the contrary, the beginning of the rope on the fixed pulley.