Engineering Mechanics: Statics
13th Edition
ISBN: 9780132915540
Author: Russell C. Hibbeler
Publisher: Prentice Hall
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Textbook Question
Chapter 8.2, Problem 1FP
Determine the friction developed between the 50-kg crate and the ground if a) P=200 N, and b) P=400 N. The coefficients of static and kinetic friction between the crate and the ground are, μs = 0.3 and, μk = 0.2.
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In the photo, the man has a mass of 60 kg and the crate has a mass of 100 kg. The coefficient of static friction between his shoes and the ground is μs = 0.4 and between the crate and the ground is μc = 0.3.
a) Determine if the man is able to move the crate using the rope-and-pulley system shown.
b) Prove your answer to part A by calculating the static frictional force F between the man's shoes and the ground required to move the crate and the maximum static frictional force Fmax which can be developed.
Express your answers in newtons to three significant figures separated by a comma.
2. Find the least value of P required to cause the system of blocks to have impending motion to
the left. The coefficient of friction is 0.2 under each block.
300 Ib
100 lb
30 °
Two blocks with masses ma = P kg and mg = 100 kg are connected with a flexible cable
that passes over a frictionless pulley as shown in Fig. The coefficient of friction between
the blocks is 0.2. If motion of the blocks is impending, determine the coefficient of friction
between block B and the inclined surface and the tension in the cable between the two
%3D
blocks. the force for P is 78kg
A
B
40°
Chapter 8 Solutions
Engineering Mechanics: Statics
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