(1)当不考虑动滑轮重及绳与滑轮之间摩擦时,拉力与被提升的物重有如下关系:
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(2)若考虑动滑轮重,不计摩擦时,拉力与被提升物重有如下关系:
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(3)若考虑摩擦,则上述关系有如下变化:
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(4)绳子自由端(即:拉力作用点)移动的距离S与重物被提升的距离h的关系:
S=nh(n为向上提升物体绳的段数)
(5)绳子自由端(即拉力作用点)移动速度VF,重物被提升的速度VG关系:
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