AP Physics

1
AP Physics

• Torque and Equilibrium Practice

2
A uniform beam weighs 200 N and holds a 450 N
object as shown in the figure below. Find the
magnitudes of the forces exerted on the beam by
the two supports at its ends.
3
Where must an 800 N object be hung on a uniform,
100 N pole so that a girl (P) at one end supports
1/3 as much as a woman (3P) at the other end?
4
A uniform, 200 N board of length L has two
objects hanging from it 300 N at L/3 from one
end, and 400 N at 3L/4 from the same end. What
additional single force (P) acting on the board
will cause the board to be in equilibrium?
5
Consider the situation shown below. The uniform,
600 N beam is hinged at P. Find the tension in
the tie rope and the components of the force
exerted by the hinge on the beam.
6
A uniform, 400 N boom is supported as shown in
the figure below. Find the tension in the tie
rope and the force exerted on the boom by the pin
at P.
7
As shown in the figure, hinges A and B hold a
uniform, 400 N door in place. The upper hinge
supports the entire weight of the door. Find the
forces exerted on the door at the hinges. The
width of the door is h/2, where h is the distance
between the hinges.
8
A ladder leans against a smooth wall. (By a
smooth wall, we mean that the wall only exerts
a perpendicular force on the wall. There is no
friction force.) The ladder weighs 200 N and its
center of gravity is 0.4 L from the base, where L
is the ladders length. (a) How large a
friction force must exist at the base of the
ladder if it is not to slip? (b) What is the
necessary coefficient of friction?