FIRST QUARTER
MR. GUTIÉRREZ
2021-2022
Dowal School
Eleventh Grade
Physics III
Torque Problem Set
Instructions: The following activity is going to be developed on Nearpod. If you
have problems with the platform, solve the problems and upload the solutions
to your OneNote. Problems without procedure won’t be taken in count.
I.
PROBLEM SOLVING
Instructions: Solve the following problems.
1). The biceps muscle exerts a vertical force on the
lower arm, bent as shown in the figure. For each
case calculate the torque about the rotational axis
through the elbow joint, assuming the muscle is
attached 5.0 cm from the elbow as shown.
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FIRST QUARTER
MR. GUTIÉRREZ
2). Two forces (FA = 30 N and FB = 20 N)
are applied to a meter stick which can
rotate about its left end. The forces are
applied as shown in the figure.
Determine the net torque on the stick,
and which force is exerting a greater torque.
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2021-2022
FIRST QUARTER
MR. GUTIÉRREZ
3). Calculate the net torque about the axle of the
wheel shown in the figure. Assume that a friction
torque of 0.40 N· m opposes the motion.
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2021-2022
FIRST QUARTER
MR. GUTIÉRREZ
4). On the following figure force A, B, C and D
have a magnitude equal to 50 N and are
being exerted on the same point of the object.
a- Calculate the torque being exerted by each
of the forces acting on the rigid object, about
point P.
b- Calculate the net torque about point P.
A/.
2021-2022
FIRST QUARTER
MR. GUTIÉRREZ
5). A wrench is used to loosen a nut.
The wrench is 25 cm long and a 17 N
force is exerted on the opposite end,
making a 37° angle with the handle.
a- What is the torque being exerted
by the wrench about the center of
the nut.
b- What is the maximum torque a
machinist could exert on the wrench,
and in which direction should it be
exerted?
A/.
2021-2022
FIRST QUARTER
6). A piece of metal rotates
around point A, as shown in
the figure. Determine the
net torque about A due to
the 60 N and 80 N forces.
A/.
MR. GUTIÉRREZ
2021-2022