CHAPTER 4 SECTION 1
Work and Power
1. What is work?
• A. The type of energy that a moving object
has
• B. The rate at which work is done or energy is
transformed
• C. The unit used to express power
• D. The transfer of energy using a force that
causes an object to move in the direction of
the force
• E. The unit used to express energy
ANSWER:
•Work is…
• D. The transfer of energy using a
force that causes an object to
move in the direction of the force
2. What is power?
• A. The type of energy that a moving object
has
• B. The rate at which work is done or energy is
transformed
• C. The unit used to express power
• D. The transfer of energy using a force that
causes an object to move in the direction of
the force
• E. The unit used to express energy
ANSWER
• Power is…
• B. The rate at which work is done or
energy is transformed
3. What is kinetic energy?
• A. The type of energy that a moving object
has
• B. The rate at which work is done or energy is
transformed
• C. The unit used to express power
• D. The transfer of energy using a force that
causes an object to move in the direction of
the force
• E. The unit used to express energy
ANSWER
• Kinetic energy is …
• A. The type of energy that a moving
object has
4. What is a joule?
• A. The type of energy that a moving object
has
• B. The rate at which work is done or energy is
transformed
• C. The unit used to express power
• D. The transfer of energy using a force that
causes an object to move in the direction of
the force
• E. The unit used to express energy
ANSWER
•A joule is…
• E. The unit used to express
energy
5. What is a watt?
• A. The type of energy that a moving object
has
• B. The rate at which work is done or energy is
transformed
• C. The unit used to express power
• D. The transfer of energy using a force that
causes an object to move in the direction of the
force
• E. The unit used to express energy
ANSWER
•A watt is…
• C. The unit used to express power
6. What is the equation used to calculate
work?
• A. W / t
• B. F x d
• C. L x w
• D. L x w x h
ANSWER
• The equation for work is …
• B. F x d
7. What is the equation to calculate
power?
• A. W / t
• B. F x d
• C. L x w
• D. L x w x h
ANSWER
The equation for power is …
• A. W / t
8. In which situation is a person doing
work on an object?
• A.
A school crossing guard raises a stop
sign that weighs 10 N.
• B. A student walks while wearing a
backpack that weighs 15 N.
• C. A man exerts 350 N force on a rope
attached to a house.
• D. A worker holds a box 1 m off the floor.
ANSWER
• A. A school crossing guard raises
a stop sign that weighs 10 N.
9. Scott applies a force of 100 N to move
a box 5 meters. How much work did he
do?
• A. 100 J
• B. 500 J
• C. 5 J
• D. 500 N
ANSWER
•B. 500 J
10. If a barbell weighs 160 N, what other
information do you need to calculate how
much work it takes to lift it?
• A.
The shape of the weights
• B. The height the barbell is being lifted
• C. The strength of the person doing the
lifting
• D. The amount of output force
ANSWER
• B. The height the barbell is being
lifted
11. Tom used 75 N of force to push a box
3 m across the floor. How much work did
he do?
a. 25 J
b. 25 N
c. 225 J
d. 225 W
ANSWER
75 N x 3 m =
c. 225 J
12. What is the power of a small motor that
can do 2500 J of work in 25 seconds?
a. 100 W
b. 100 N
c. 62,500 W
d. 10 N
ANSWER
2500 J / 25 s =
a. 100 W
GOOD LUCK ON MONDAY!!
STUDY HARD!!
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