Question

Imagine a situation in which the horizontal surface of block is smooth and its vertical surface is rough with a coefficient of friction Identify the correct statement(s)

- If F = 0, the blocks cannot remain stationary
- for one unique value of F, the blocks M and m remain stationary with respect to
- the limiting friction between m and is independent of F
- there exist a value of F at which friction force is equal to zero

## The correct answer is: If F = 0, the blocks cannot remain stationary

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