The coefficient of static friction us between the 111-lb body and the 18° wedge is 0.17. Determine the magnitude of the force P required to begin raising the 111-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static friction µs = 0.17 applies at this surface as well. Answers: (a) P = (b) P= i i 18° 111 lb lb lb

The coefficient of static friction us between the 111-lb body and the 18° wedge is 0.17. Determine the magnitude of the force P required to begin raising the 111-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static friction µs = 0.17 applies at this surface as well. Answers: (a) P = (b) P= i i 18° 111 lb lb lb

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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Question

The coefficient of static friction µs between the 111-lb body and the 18° wedge is 0.17. Determine the magnitude of the force P required to begin raising
the 111-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static
friction μs = 0.17 applies at this surface as well.
Answers:
(a) P =
(b) P =
M.
18°
111 lb
lb
lb

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