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同学们在解答有关机械效率问题时,往往会出现一知半解的情况,其根本原因,是对机械效率中有用功与总功的确定,特别是有用功的确定存在困难。现对杠杆、斜面、滑轮组三种简单机械的机械效率进行分析。杠杆、斜面、滑轮组这三种简单机械,其机械效率均可用一个普遍性的公式来表示,只是对于不同的简单机械,其公式中的G、h、F、s所代表的物理意义有所不同。
When students are answering questions about mechanical efficiency, there is often a half-baked situation. The basic reason is that the useful work and total work are determined in the mechanical efficiency, and especially the determination of useful work is difficult. The mechanical efficiency of the three simple mechanical mechanisms of levers, slopes, and pulleys is now analyzed. The mechanical efficiency of three kinds of simple machines such as levers, slopes, and pulleys can be expressed by a universal formula, but for different simple machines, the physical meanings represented by G, h, F, and s in the formula are different. .