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Work Practice; Do not write on this
1. Rosie is out with her friends. Misfortune occurs and they find themselves pushing the car. They
apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the
work done on the car.
2. Hans Gruber is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and
rightwards with a force of 22.9N at an angle of 35 degrees above the horizontal to drag his backpack
a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the
backpack.
3. Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight
in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head
with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90
m above the ground.
4. While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute,
displacing its center of mass by a distance of 8.5 cm for each pushup.
Determine the total work done on the squirrel while moving upward (32 times).
5. A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in a auto service
station. Lifting the more massive car requires ____ work.
a. less
b. the same
c. twice as much
d. four times as much
Work Practice; Do not write on this
1. Rosie is out with her friends. Misfortune occurs and they find themselves pushing the car. They
apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the
work done on the car.
2. Hans Gruber is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and
rightwards with a force of 22.9N at an angle of 35 degrees above the horizontal to drag his backpack
a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the
backpack.
3. Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight
in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head
with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90
m above the ground.
4. While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute,
displacing its center of mass by a distance of 8.5 cm for each pushup.
Determine the total work done on the squirrel while moving upward (32 times).
5. A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in a auto service
station. Lifting the more massive car requires ____ work.
a. less
b. the same
c. twice as much
d. four times as much
6. Which of the following statements are true about work? Include all that apply.
a. A Watt is the standard metric unit of work.
b. Units of work would be equivalent to a Newton times a meter.
c. A kg•m2/s2 would be a unit of work.
d. Work is a time-based quantity; it is dependent upon how fast a force displaces an object.
e. Superman applies a force on a truck to prevent it from moving down a hill. This is an example of
work being done.
f. An upward force is applied to a bucket as it is carried 20 m across the yard. This is an example
of work being done.
g. The force of friction acts upon a softball player as she makes a headfirst dive into third base.
This is an example of work being done.
h. A force acts upon an object to push the object along a surface at constant speed. By itself, this
force must NOT be doing any work upon the object.
i. A force acts upon an object at a 90-degree angle to the direction that it is moving. This force is
doing negative work upon the object.
j. An individual force does NOT do positive work upon an object if the object is moving at
constant speed.
6. Which of the following statements are true about work? Include all that apply.
a. A Watt is the standard metric unit of work.
b. Units of work would be equivalent to a Newton times a meter.
c. A kg•m2/s2 would be a unit of work.
d. Work is a time-based quantity; it is dependent upon how fast a force displaces an object.
e. Superman applies a force on a truck to prevent it from moving down a hill. This is an example of
work being done.
f. An upward force is applied to a bucket as it is carried 20 m across the yard. This is an example
of work being done.
g. The force of friction acts upon a softball player as she makes a headfirst dive into third base.
This is an example of work being done.
h. A force acts upon an object to push the object along a surface at constant speed. By itself, this
force must NOT be doing any work upon the object.
i. A force acts upon an object at a 90-degree angle to the direction that it is moving. This force is
doing negative work upon the object.
j. An individual force does NOT do positive work upon an object if the object is moving at
constant speed.