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（达州专版）2019中考物理第五单元机械与功能量第17课时机械效率复习课件.ppt

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第五单元 机械与功 能量,学生用书P67,第17课时 机械效率,越大,高,低,不会,无关,额外功,有用功,学生用书P67,B,乙,80%,1、2,越低,不正确,摩擦力,3.8,73.5%,提升重物的重力,【答案】 (1)F250 N(2)P300 W(3)f100 N,A,学生用书P69,C,C,C,D,B,C,D,7.5,75%,变大,160,80%,40,60,100,200,A,

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