《功和机械能》单元检测题四.doc
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9、一、选择题(本大题共10个题,每题4分,共40分)1某中学进行大扫除,同学们都忙得热火朝天,满头大汗,其中并没有对物体做功的是( )A小玉用力把水桶提起 B小园端着水盆走进教室C小浩用抹布擦玻璃 D小华把凳子倒放在课桌上2在如图所示的四种情境中,人对物体做功的是( )A提着水桶在水平地面上匀速前进 B扛着米袋慢慢爬上楼梯C用力推汽车,汽车没动 D举着杠铃原地不动3如图所示,用大小相等的拉力F1、F2、F3使同一物体分别沿着水平面、斜面和竖直方向移动相同的距离s,拉力F1、F2、F3所做的功分别是W1、W2、W3。下列判断正确的是( )AW1W2W3BW1W2W3CW1W2W3DW1W2W34如
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