省力杠杆公式

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  • 拉杆式旅行箱省力杠杆

    不平衡的杠杆什么样?一种拉杆式旅行箱是省力杠杆,若箱和物品共...
    第1问:由平衡条件得 F动*L动=F阻*L阻,F动=F阻*L阻/L动=100/5=20牛顿第2问:如果动力大于20牛顿,则箱子被抬起来(

    2018-07-12 23:24:35 29
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