(2015-07-21 20:44)-
06-28[物理]李老师教你处理滑轮组的基本方法 推荐理由：同学初始学习的滑轮有动滑轮和定滑轮两种，对于单一的动滑轮或定滑轮的题目不是很难。但是在实际出现的题目中还会出现两种滑轮同时存在的情况，在解决此类问题时，同学们可能会觉得有困难，下面李老师将教你通过对每一个滑轮单独进行受力...全文
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zhangyitongxue1：应该 滑轮重是12牛。(2015-07-18 15:37)
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jinwuqi：4N,很容易错喔(2015-07-17 12:05)
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lishengao：6ndaxiao(2015-03-15 12:12)
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wattergz：应该是4N(2014-11-18 15:06)
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q430488：6161(2014-01-30 14:12)
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QAZ5512398：非常想听听详解 ，谢谢老师(2013-10-24 10:05)
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LW2013：不知道啊(2013-08-07 09:52)
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YuLanYing：6N(2013-08-06 21:08)
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YuLanYing：4N(2013-08-06 21:05)
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