The force P is applied to the 37-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by thesurface on the block if (a) P = 0, (b) P = 107 N, and (c) P = 168 N. (d) What value of P is required to initiate motion up the incline? Thestatic and kinetic coefficients of friction between the block and the incline are us = 0.19 and k = 0.16, respectively. The friction force ispositive if up the incline, negative if down the incline.Answers:(a) F=37 kg12°i(b) F= i(c) F= i(d) P= i21°H.= 0.19H₁ = 0.16zzzNNNN

The direction of force friction is always opposite to the motion

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