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【简答题】
如图 4. 7 .16 所示,有一块木板静止在光滑而且足够长的水平面上,木板的质量为 M = 4 kg、长为 L = 1.4 m,木板右端放着一个块,块质量m=1 kg,其尺寸远小于L,块与木板间的动摩擦因数为 μ = 0.4。( g 取 10 m/s 2 ) (1) 现用恒力 F 作用在木板 M上,为使m能从M上面滑落下来,问: F 大小的范围是多少? (2) 其他条件不变,若恒力 F = 22.8 N,且始终作用在 M 上,最终使得 m 能从 M 上滑落下来,问: m 在 M 上面滑动的时间是多少?
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