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範例:動摩擦力與等速運動[92學測補考]

ㄧ個在水平地上的箱子,當受到的水平推力為F時(F >0),以2 公尺/秒的等速度向前移動。若地面摩擦力以外的阻力可以不計,則下列敘述,何者正確?(A)當推力為2F 時,箱子會以4 公尺/秒的等速度移動(B)當箱子等速度移動時,推力F 所做的總功為零(C)推力F的大小必須大於箱子所受的摩擦力(D)推力F的大小等於箱子所受的摩擦力(E)推力F的大小必須大於箱子的重量。[92學測補考]

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Posted in 歷屆學測(推甄)考題, 歷屆學測試題, 牛頓運動定律.

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