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CHAPTER 8
PROBLEM 8.1
Determine whether the block shown is in equilibrium and find the magnitude
and direction of the friction force whenP 150 N.
PROBLEM 8.2
Determine whether the block shown is in equilibrium and find the magnitude
and direction of the friction force when P 400 N.
PROBLEM 8.3
Determine whether the block shown is in equilibrium and find the
magnitude and direction of the friction force when P 120 lb.
PROBLEM 8.4
Determine whether the block shown is in equilibrium and find the
magnitude and direction of the friction force when P 80 lb.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 8.5
Determine the smallest value of P required to (a) start the block up the
incline, (b) keep it moving up.
PROBLEM 8.5 (Continued)
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 8.6
The 20-lb block A hangs from a cable as shown. Pulley C is connected by a
short link to block E, which rests on a horizontal rail. Knowing that the
coefficient of static friction between block E and the rail is s = 0.35 and
neglecting the weight of block E and the friction in the pulleys, determine
the maximum allowable value of θ if the system is to remain in equilibrium.
PROBLEM 8.7
The 10-kg block is attached to link AB and rests on a moving belt.
Knowing that
s
= 0.30 and
k
= 0.25 and neglecting the weight of the
link, determine the magnitude of the horizontal force
P
that should be
applied to the belt to maintain its motion (a) to the left as shown, (b) to
the right.
PROBLEM 8.7 (Continued)
