A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force

Question

A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.3 N and a vertical force P are then applied to the block. The coefficients of friction for the block and surface are mu s = 0.36 and mu k = 0.20. Determine the magnitude of the frictional force acting on the block if the magnitude of P is 8.0 N. N Determine the magnitude of the frictional force acting on the block if the magnitude of P is 10.0 N. N Determine the magnitude of the frictional force acting on the block if the magnitude of P is 12.0 N. N

Explanation / Answer

(a) Frictional force            f = N              = uk [ mg - P]              = 0.20 [ 24.5 - 8]              = 3.3 N (b) f = 2.9 N (c) f = 2.5 N

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