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机械效率问题的计算是初中物理的重点和难点,同时也是历年来中考命题的热点,对于机械效率,同学们一般都知道用公式η=W有用/W总,但是不同的情境中计算有用功和总功时常因思维定势而出
Mechanical efficiency problem is the calculation of the junior high school physics focus and difficulty, but also over the years in the middle school entrance examination topics hot, for mechanical efficiency, students generally know the formula η = W useful / W total, but different situations calculate useful work and The total work often because of thinking out