如图,人的质量为M,物块的质量为m,且M>m,若不计绳与滑轮的摩擦,则当人拉止,则下列说法中正确的是A.N不变,f不变 B.N变大,f变大C.N变大,f变小 D.N变小,f变大答案选B,就不懂为什么,N变
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![如图,人的质量为M,物块的质量为m,且M>m,若不计绳与滑轮的摩擦,则当人拉止,则下列说法中正确的是A.N不变,f不变 B.N变大,f变大C.N变大,f变小 D.N变小,f变大答案选B,就不懂为什么,N变](/uploads/image/z/1523550-30-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%BA%BA%E7%9A%84%E8%B4%A8%E9%87%8F%E4%B8%BAM%2C%E7%89%A9%E5%9D%97%E7%9A%84%E8%B4%A8%E9%87%8F%E4%B8%BAm%2C%E4%B8%94M%3Em%2C%E8%8B%A5%E4%B8%8D%E8%AE%A1%E7%BB%B3%E4%B8%8E%E6%BB%91%E8%BD%AE%E7%9A%84%E6%91%A9%E6%93%A6%2C%E5%88%99%E5%BD%93%E4%BA%BA%E6%8B%89%E6%AD%A2%2C%E5%88%99%E4%B8%8B%E5%88%97%E8%AF%B4%E6%B3%95%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AFA%EF%BC%8EN%E4%B8%8D%E5%8F%98%2Cf%E4%B8%8D%E5%8F%98+++++B%EF%BC%8EN%E5%8F%98%E5%A4%A7%2Cf%E5%8F%98%E5%A4%A7C%EF%BC%8EN%E5%8F%98%E5%A4%A7%2Cf%E5%8F%98%E5%B0%8F+++++D%EF%BC%8EN%E5%8F%98%E5%B0%8F%2Cf%E5%8F%98%E5%A4%A7%E7%AD%94%E6%A1%88%E9%80%89B%2C%E5%B0%B1%E4%B8%8D%E6%87%82%E4%B8%BA%E4%BB%80%E4%B9%88%2CN%E5%8F%98)
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