Question

Step 1

There are 4 forces, the push P, weight mg, a normal force N, and a frictional force F_{f}. The direction of the friction force depends on how much P is pushing on the block.

Step 2

For the case in which P is minimum for stability and in that position the friction force is holding the block up and goes up to the right. In the other case, for which P to be maximum, the friction force is keeping from the sliding up the slope and is going down to left.

Step 3

Onsubstituting values in equation (4) and (5) the va...

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