17. (a) The free-body diagram for the block is shown below. GFis the applied force, NFGis the normal force of the wall on the block, Gfis the force of friction, and mgGis the force of gravity. To determine if the block falls, we find the magnitude fof the force of friction required to hold it without accelerating and also find the normal force of the wall on the block. We compare fand μsFN.Iff< sFN, the block does not slide on the wall but if f> sFN, the block does slide. The horizontal component of Newton’s second
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