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CHAPTER 5—WORK AND ENERGY
MULTIPLE CHOICE
1. In which of the following sentences is work used in the scientific sense of the word?
a. Holding a heavy box requires a lot of work.
b. A scientist works on an experiment in the laboratory.
c. Sam and Rachel pushed hard, but they could do no work on the car.
d. John learned that shoveling snow is hard work.
2. In which of the following sentences is work used in the everyday sense of the word?
a. Lifting a heavy bucket involves doing work on the bucket.
b. The force of friction usually does negative work.
c. Sam and Rachel worked hard pushing the car.
d. Work is a physical quantity.
3. A force does work on an object if a component of the force
a. is perpendicular to the displacement of the object.
b. is parallel to the displacement of the object.
c. perpendicular to the displacement of the object moves the object along a path that
returns the object to its starting position.
d. parallel to the displacement of the object moves the object along a path that returns
the object to its starting position.
4. Work is done when
a. the displacement is not zero.
b. the displacement is zero.
c. the force is zero.
d. the force and displacement are perpendicular.
5. What is the common formula for work? Assume that W is the work, F is a constant force, v is
the change in velocity, and d is the displacement.
a. W = Fv c. W = Fd2
b. W = Fd d. W = F2 d
6. If the sign of work is negative,
a. the displacement is perpendicular to the force.
b. the displacement is in the direction opposite the force.
c. the displacement is in the same direction as the force.
d. no work is done.
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7. In which of the following scenarios is work done?
a. A weightlifter holds a barbell overhead for 2.5 s.
b. A construction worker carries a heavy beam while walking at constant speed along a
flat surface.
c. A car decelerates while traveling on a flat stretch of road.
d. A student holds a spring in a compressed position.
8. In which of the following scenarios is no net work done?
a. A car accelerates down a hill.
b. A car travels at constant speed on a flat road.
c. A car decelerates on a flat road.
d. A car decelerates as it travels up a hill.
9. A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What
is the net work done on the ice-cream cone?
a. 0 J c. 2 J
b. 0.5 J d. 20 J
10. A worker does 25 J of work lifting a bucket, then sets the bucket back down in the same place. What
is the total net work done on the bucket?
a. –25 J c. 25 J
b. 0 J d. 50 J
11. A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much
work is done by the worker on the wheelbarrow?
a. 10 J c. 250 J
b. 55 J d. 1250 J
12. A horizontal force of 200 N is applied to move a 55 kg television set across a 10 m level surface.
What is the work done by the 200 N force on the television set?
a. 550 J c. 6000 J
b. 2000 J d. 11000 J
13. A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60 below horizontal. How much
work does the child do on the balloon?
a. –10 J c. 6.0 J
b. –6.0 J d. 12 J
14. Which of the following energy forms is associated with an object in motion?
a. potential energy c. nonmechanical energy
b. elastic potential energy d. kinetic energy
15. Which of the following energy forms is associated with an object due to its position?
a. potential energy c. total energy
b. positional energy d. kinetic energy
16. Which of the following energy forms is not involved in hitting a tennis ball?
a. kinetic energy c. gravitational potential energy
b. chemical potential energy d. elastic potential
energy
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