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The force P is applied to the 31-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P= 1201 and (c) P= 175 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are = 0.24 and = 0.18, respectively. The friction force is positive if up the incline, negative if down the incline. 31 kg 15 4 21° H,= 0.24 P₁ = 0.18

The force P is applied to the 31-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P= 1201 and (c) P= 175 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are = 0.24 and = 0.18, respectively. The friction force is positive if up the incline, negative if down the incline. 31 kg 15 4 21° H,= 0.24 P₁ = 0.18

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The force P is applied to the 31-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 120 N, and (c) P = 175 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are = 0.24 and Uk = 0.18, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= (b) F= (c) F= (d) P= 31 kg 15° 21° H₂= 0.24 H= 0.18 N N N N
Transcribed Image Text:The force P is applied to the 31-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 120 N, and (c) P = 175 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are = 0.24 and Uk = 0.18, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= (b) F= (c) F= (d) P= 31 kg 15° 21° H₂= 0.24 H= 0.18 N N N N
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