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机械效率是指在使用简单机械时有用功占总功的比率.在初中教材中所接触的是利用滑轮组等一类简单机械的问题,实际上在发生能量的转化或转移过程中,都存在着能量的转化率(即效率)问题.近年来,此类问题在中考物理试题中频频出现.本文将其归类例析,供同学们复习时参考.1.燃料燃烧类
Mechanical efficiency refers to the ratio of useful work to total work when using simple machines. In the junior high school textbooks, the problem of using a simple machine such as pulleys is actually a problem. Actually there is a conversion or transfer of energy. Energy conversion rate (ie, efficiency) problem. In recent years, this type of problem has frequently appeared in the physics examination papers in middle schools. This article classifies them as examples for reference when reviewing by students. 1. Fuel combustion