如图所示,质量为m的滑块放在倾角为θ的固定斜面上.滑块与斜面之

如图所示,质量为m的滑块放在倾角为θ的固定斜面上.滑块与斜面之间的动摩擦因数为μ.若滑块与斜面之间的最大静摩擦力与滑动摩擦力大小相等,重力加速度为g,则(    )

A.给滑块沿斜面向下的初速度,如果μtan θ,滑块将减速下滑

B.将滑块由静止释放,如果μtan θ,滑块将下滑

C.用平行于斜面向上的力拉滑块向上匀速滑动,如果μtan θ,拉力大小应是2mgsin θ

D.用平行于斜面向下的力拉滑块向下匀速滑动,如果μtan θ,拉力大小应是mgsin θ

答案

C

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