A wrench is used to attempt to turn a bolt. The bolt has a radius of 1cm and the
wrench is 30cm long.
Draw the extended force diagram for the bolt/wrench system.
F
A wrench is used to attempt to turn a bolt. The bolt has a radius of 1cm and the
wrench is 30cm long.
Write out the expression that would determine the magnitude of the frictional force
necessary to keep the bolt from turning.
F
A 60 lb child sits on the end of an 18 foot long teeter-totter. Where should her father
(who is 180 lbs) sit to balance the teeter-totter? Draw an extended force diagram.
18 feet
A 60 lb child sits on the end of an 18 foot long teeter-totter. Her father (who is 180 lbs)
sits on the opposite side to balance the teeter-totter. If the teeter-totter weighs 20lbs,
what force does the support exert? Draw a free body diagram.
18 feet
An 80kg worker stands on a 30kg platform. What happens to the horizontal
component of the force of the wall on the platform as the worker moves toward the
wall?
a) It increases.
b) It decreases.
c) It remains the same.
d) There is no horizontal component of the force of the wall on the platform.
2m
3m
An 80kg worker stands on a 30kg platform. Draw a free body diagram and an
extended force diagram for the platform.
2m
3m
An 80kg worker stands on a 30kg platform. Write the expressions (Newton’s Law)
that would determine the tension in the cable and the magnitude and direction of the
force of the wall on the platform.
2m
3m
A person holds a 10 lb ball at 50° from the vertical. The persons forearm weighs 5 lbs
and is 0.5 m long. The bicep is attached 2” from the elbow.
Draw a free body diagram and an extended force diagram for the person’s forearm.
50°
10 lb
A person holds a 10 lb ball at 50° from the vertical. The persons forearm weighs 5 lbs
and is 0.5 m long. The bicep is attached 2” from the elbow.
Write the expressions that would determine the force exerted by the bicep and the
magnitude and direction of the force of the elbow on the forearm.
50°
10 lb
A person holds a 10 lb ball at 50° from the vertical. The persons forearm weighs 5 lbs
and is 0.5 m long. The bicep is attached 2” from the elbow.
What happens to the force exerted by the bicep and the magnitude and direction of
the force of the elbow on the forearm as the angle is decreased from 50˚ to 30˚?
50°
10 lb
A 40 lb platform is supported at one end and 10 feet from that end. If the platform is
12 feet long, how far can a 160 lb person walk out before the platform will tip?
For the hanging sign shown below, draw the appropriate diagrams for the platform
and give their respective equations.

Mouse
Makeovers
2L
For the shark hanging from the 4 m post shown below, draw the appropriate
diagrams for the platform and give their respective equations.
20
60
The box below is sliding along the floor at a constant speed. Draw the appropriate
diagrams to determine the coefficient of friction and the height, h, of the force that will
cause the box to tip over.
60cm
200N
37°
100cm
h
Weights are hung from the ends of a light meter stick. Draw appropriate diagrams.
a) Where should you hold the stick to balance it?
b) What force must you exert?
10 lb
15 lb
finger