题目内容
如图所示,AO和BO悬挂一个重物,现将绳子AO由如图所示的位置移到竖直,该过程中,OB绳子始终保持水平,则下列说法中正确的是 ( )
2021-08-15
A.OA绳子拉力减小
B.OA绳子拉力先减小后增大
C.OB绳子拉力减小
D.OB绳子拉力增大
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