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PROBLEM 8.F1
Knowing that the coefficient of friction between the 25-kg block and the
incline is
s = 0.25, draw the free-body diagram needed to determine both the
smallest value of P required to start the block moving up the incline and the
corresponding value of
.
PROBLEM 8.F2
Two blocks A and B are connected by a cable as
shown. Knowing that the coefficient of static friction
at all surfaces of contact is 0.30 and neglecting the
friction of the pulleys, draw the free-body diagrams
needed to determine the smallest force P required to
move the blocks.
PROBLEM 8.F3
A cord is attached to and partially wound around a cylinder with a weightof
W and radius r that rests on an incline as shown. Knowing that θ = 30°, draw
the free-body diagram needed to determine both the tension in the cord and
the smallest allowable value of the coefficient of static friction between the
cylinder and the incline for which equilibrium is maintained.
PROBLEM 8.F4
A 40-kg packing crate must be moved to the left along the floor without
tipping. Knowing that the coefficient of static friction between the crate
and the floor is 0.35, draw the free-body diagram needed to determine
both the largest allowable value of α and the corresponding magnitude of
the force P.
