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机械效率是中考物理中的一个重点、难点,不少同学在解有关机械效率的习题时很容易出错,根据笔者分析,错误的原因是掉进了机械效率理解的几大误区.现举例对这几大误区进行分析,以便同学们可以更深刻地理解机械效率的意义.
Mechanical efficiency is a key and difficult point in the physics of middle school entrance examination. Many students are prone to making mistakes in solving exercises related to mechanical efficiency. According to the author’s analysis, the reason for the error is that they fell into the major misunderstandings of understanding mechanical efficiency. Several major misunderstandings are analyzed so that students can understand the meaning of mechanical efficiency more profoundly.