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BD
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P is stagnant, and this means that u > tanA. In this occasion, whatever the mass of P, it won't move. Putting Q on P is similar to increasing the mass of P, so P will stay stagnant. So, B is true and A is false.
C: The total force is 0, since P is stagnant. C is wrong.
D: f = mgsinA. As m increases, f increases. D is right.
Sorry there is something wrong with my sougou input and I cannot input Chinese now...
P is stagnant, and this means that u > tanA. In this occasion, whatever the mass of P, it won't move. Putting Q on P is similar to increasing the mass of P, so P will stay stagnant. So, B is true and A is false.
C: The total force is 0, since P is stagnant. C is wrong.
D: f = mgsinA. As m increases, f increases. D is right.
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BD P肯定受斜面摩擦力 而且与重力的下滑分力守恒
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