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21.如图,在光滑水平面上有一质量为m1的足够长的木板,其上叠放一质量为m2 的木块。假定木块和木板之间的最大静摩擦力和滑动摩擦力相等。现给木块施加一随时间t增大的水平力F=kt(k是常数),木板和木
問題詳情
21.如图,在光滑水平面上有一质量为m1的足够长的木板,其上叠放一质量为m2 的木块。假定木块和木板之间的最大静摩擦力和滑动摩擦力相等。现给木块施加一随时间t增大的水平力F=kt(k是常数),木板和木块加速度的大小分别为a1和a2,下列反映a1和a2变化的图线中正确的是
(A)
(B)
(C)
(D)
參考答案
答案:A
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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