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滚子是可以滚动以减少摩擦力的物体古埃及人搬运巨石时即用树干垫于下方以便运输,现今滚子或滚筒仍然广泛应用,例如机械轴承(啤令),运输带等。多数滚子用于降低摩擦力,但亦有滚筒系增加摩擦力,例如打印机内有大量滚筒用作送纸,要有摩擦力才行。

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