The force P is applied to the 40-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 = 118 N, and (c) P = 166 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 μ = 0.17 and Uk = 0.13, respectively. The friction force is positive if up the incline, negative if down the incline.

The force P is applied to the 40-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 = 118 N, and (c) P = 166 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 μ = 0.17 and Uk = 0.13, respectively. The friction force is positive if up the incline, negative if down the incline.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.23P: The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of...

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b.22

Your answer is partially correct.
The force P is applied to the 40-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 = 118 N, and (c) P = 166 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 μs = 0.17 and Uk = 0.13, respectively. The friction force is
positive if up the incline, negative if down the incline.
Answers:
(a) F=
(c) F=
40 kg
(d) P=
10⁰
50
(b) F= i -60
-43
132
19°
H₂ = 0.17
H₂ = 0.13
N
N
N
N

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