力学平衡用一轻绳将小球p系于光滑墙壁O点,在墙壁和球p之间夹有一矩形Q.PQ均处于静止状态,下列说法正确的是AQ受3个力BP受4个力C若绳子变短,Q受摩擦力将增大D若绳子变长,绳子拉力将变小
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![力学平衡用一轻绳将小球p系于光滑墙壁O点,在墙壁和球p之间夹有一矩形Q.PQ均处于静止状态,下列说法正确的是AQ受3个力BP受4个力C若绳子变短,Q受摩擦力将增大D若绳子变长,绳子拉力将变小](/uploads/image/z/1498334-14-4.jpg?t=%E5%8A%9B%E5%AD%A6%E5%B9%B3%E8%A1%A1%E7%94%A8%E4%B8%80%E8%BD%BB%E7%BB%B3%E5%B0%86%E5%B0%8F%E7%90%83p%E7%B3%BB%E4%BA%8E%E5%85%89%E6%BB%91%E5%A2%99%E5%A3%81O%E7%82%B9%2C%E5%9C%A8%E5%A2%99%E5%A3%81%E5%92%8C%E7%90%83p%E4%B9%8B%E9%97%B4%E5%A4%B9%E6%9C%89%E4%B8%80%E7%9F%A9%E5%BD%A2Q.PQ%E5%9D%87%E5%A4%84%E4%BA%8E%E9%9D%99%E6%AD%A2%E7%8A%B6%E6%80%81%2C%E4%B8%8B%E5%88%97%E8%AF%B4%E6%B3%95%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AFAQ%E5%8F%973%E4%B8%AA%E5%8A%9BBP%E5%8F%974%E4%B8%AA%E5%8A%9BC%E8%8B%A5%E7%BB%B3%E5%AD%90%E5%8F%98%E7%9F%AD%2CQ%E5%8F%97%E6%91%A9%E6%93%A6%E5%8A%9B%E5%B0%86%E5%A2%9E%E5%A4%A7D%E8%8B%A5%E7%BB%B3%E5%AD%90%E5%8F%98%E9%95%BF%2C%E7%BB%B3%E5%AD%90%E6%8B%89%E5%8A%9B%E5%B0%86%E5%8F%98%E5%B0%8F)
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