The force Pis applied to the 52-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 = 165 N, and (c) P = 265 N. (d) What value of Pis required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are u, = 0.20 and Hg = 0.15, respectively. The friction force is positive if up the incline, negative if down the incline.

The force Pis applied to the 52-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 = 165 N, and (c) P = 265 N. (d) What value of Pis required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are u, = 0.20 and Hg = 0.15, 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 7.72P

See similar textbooks

Similar questions

The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire.
The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide.
The force Pis applied to the 49-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 - 199 N, and (c) P- 308 N. (d) What value of Pis required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are p, - 0.25 and u - 0.20, respectively. The friction force is positive if up the incline, negative if down the incline. 49 kg 20 H,= 0.25 = 0.20 16 Answers: (a) F- (b) F- (c) F- (d) P- z z z z
The force P is applied to the 53-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=185 N, and (c) P=292 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 ₁-0.24 and U-0.19, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F- (c) F= 53 kg 14° (d) P= (b) F- i i i 23 P=0.24 P₁=0.19 N N N N
The force P is applied to the 41-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-184 N, and (c) P-251 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 ,-0.26 and 0.23, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F- (b) F- (c) F- 41 kg 16° i i i (d) P- i 25 P₁ = 0.26 M₁=0.23 N N N N Activ
The force P is applied to the 61-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 = 258 N, and (c) P = 449 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 Ng = 0.31 and ug = 0.28, respectively. The friction force is positive if up the incline, negative if down the incline. 61 kg 29 H,= 0.31 H= 0.28 19 The tolerance is ± 1 in the 3rd significant digit. (a) F= i N (b) F= i (c) F= i (d) P= i N
The force Pis applied to the 57-kg block when it is at rest. Determine the magnitude and direction of th friction force exerted by the surface on the block if (a) P = 0, (b) P = 278 N, and (c) P = 405 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 u, = 0.30 and Hg = 0.27, respectively. The friction force is positive up the incline, negative if down the incline. 57 kg 27° H.= 0.30 H = 0.27 19 Answers: (a) F= i ! N (b) F= i ! N (c) F = !N (d) P= i ! N
The force P is applied to the 42-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-147 N, and (c) P-193 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 ₁-0.20 and = 0.16, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= (b) F= (c) F= 42 kg 12° i i (d) P= i 18 P=0.20 P₁ = 0.16 N N N N
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 the surface 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? The static and kinetic coefficients of friction between the block and the incline are us = 0.19 and k = 0.16, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F= 37 kg 12° i (b) F= i (c) F= i (d) P= i 21° H.= 0.19 H₁ = 0.16 zzz N N N N
The force P is applied to the 500-N 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 = 100 lb, and (c) P = 300 lb. (d) What value of P is required to initiate motion up the incline? The coefficients of static and kinetic friction between the block and the incline are ?? = 0.25 and ?? = 0.20, respectively
2. The two 200-lb blocks are pushed apart by the 15° wedge of negligible weight. The angle of static friction is 12° at ali contact surfaces. Determine the force P required to start the blocks moving. 1515 200 lb 200 lb