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Energy, Work, and Power

Total questions: 98

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

The ability to do work or cause change:

a)

work

b)

energy

c)

momentum

d)

power

2.

Energy in the form of motion.

a)

mechanical energy

b)

potential energy

c)

kinetic energy

d)

momentum

3.

Stored energy in the form of position or condition.

a)

potential energy

b)

kinetic energy

c)

momentum

d)

mechanical energy

4.

What is needed to calculate work?

a)

force

b)

distance

c)

time

d)

mass

5.

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

a)

12 J

b)

8 J

c)

20 J

d)

5 J

6.

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

a)

18 m

b)

4 m

c)

10 m

d)

6 m

7.

What is mechanical energy?

a)

total kinetic energy

b)

the energy of motion

c)

total kinetic and potential energy

d)

temperature plus heat

8.

Which of these items is not part of the law of conservation of energy?

a)

energy cannot be created

b)

energy cannot be destroyed

c)

energy can be transferred between forms

d)

energy is destroyed by friction

9.

Where is the kinetic energy of pendulum at its highest?

a)

at the top of the swing

b)

at the bottom of the swing

c)

at 1/4 of the swing

d)

at 3/4 of the swing

10.

At which point of this roller coaster is the energy 1/2 kinetic and 1/2 potential?

a)

A

b)

B

c)

C

d)

D

11.

What is needed calculate power?

a)

work

b)

time

c)

mass

d)

distance

12.

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

a)

100 watts

b)

400 watts

c)

104 watts

d)

50 watts

13.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
14.

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

a)

1457 Joules

b)

22,584 Joules

c)

15 Joules

d)

45,167Joules

15.
What would have the greatest kinetic energy?
a)
A car driving down a hill.
b)
A person running down a hill. 
c)
A ball rolling down a hill. 
16.
Which is the best example that something has kinetic energy?
a)
a. a car parked on a steep hill 
b)
b. a tennis ball rolling across the court
c)
c. a picture hanging on the wall 
d)
d. a piece of coal before it's burned 
17.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
18.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
19.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

20.
True or false: when the distance an object moves is zero the work done on the object is also zero.  
a)
True
b)
False
21.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
22.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

23.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

24.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

25.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
26.

If you increase your work and decrease your time, you will have

a)

more power

b)

less power

c)

same amount of power

d)

power rating can not be determined

27.

What would you solve for if given time and work?

a)

power

b)

force

c)

distance

d)

work

28.

what would you solve for if given distance and force?

a)

work

b)

power

c)

time

d)

motion

29.

What would you solve for if you were given work and distance

a)

power

b)

time

c)

force

d)

motion

30.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
31.
which point has the most potential energy
a)
G
b)
f
c)
b
d)
a
32.
When you stretch a rubber band, you are storing __________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
33.
Which 2 letters have the most kinetic energy
a)
W & Y
b)
X & Z
34.
How much pontential energy is at the top of a hill on a rollar coaster ride
a)
100%
b)
50%
c)
0%
d)
20%
35.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
36.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
37.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
38.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
39.

Which of the following best describes the physics definition of 'work'?

a)

Applying a force to an object and causing it to move

b)

Lifting something heavy, regardless of movement

c)

Holding an object in place without moving it

d)

Thinking hard about a problem

40.

Which of the following scenarios demonstrates work being done according to the scientific definition?

a)

Lifting a barbell while lying on a bench

b)

Shoveling snow

c)

Pushing a lawn mower

d)

Arm wrestling in a tie

e)

Sitting against a wall in a squat position

41.

What is the formula used to calculate work in physics?

a)

Work = Force x Distance

b)

Work = Mass x Acceleration

c)

Work = Power x Time

d)

Work = Energy / Time

42.

How much work has Susan done if she exerts an upward force of 10.0 N to lift a textbook onto a shelf 1.5 m high?

(a)  

43.

Explain the difference between work and power using the formulas provided.

a)
Work is the speed at which energy is transferred.
b)
Power is the total energy used regardless of time.
c)
Work is energy transferred by force over distance; power is the rate of doing work.
d)
Work is the same as power; both are measured in joules.
44.

A boy weighing 400 N runs up a 6 m high staircase in 5 seconds. What is the total work done by the boy?

a)

2400 J

b)

480 W

c)

400 J

d)

2000 J

45.

Calculate the power exerted by the boy if he does 2400 J of work in 5 seconds.

a)

480 W

b)

400 W

c)

2400 W

d)

120 W

46.

Which of the following everyday objects has the highest power rating according to the image?

a)

Light bulb

b)

Horse

c)

Runner

d)

Car

47.
1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?
a)
2 J
b)
0.5 J
48.
A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?
a)
3 J
b)
45 J
49.
It took 50 joules to push a chair 5 meters across the floor. With what force wast the chair pushed?
a)
250N
b)
10N
50.
A force of 100 newtons was necessary to lift a rock.  A total of 150 joules of work was done.  How far was the rock lifted?
a)
1.5m
b)
15,000 m
51.
It took 500 newtons of force to push a car 4 meters.  How much work was done?
a)
2,000 J
b)
125 J
52.
A young man exerted a force of 9,000 newtons on a stalled car but was unable to move it.  How much work was done?
a)
9,000 J
b)
0 J= No work
53.

Newtons are the correct unit for which of the following?

a)

Force

b)

Work

c)

Power

d)

Acceleration

54.
In order to do work on an object, the force you exert must be...
a)
The maximum amount of force you are able to exert.
b)
In the same direction as the object's motion.
c)
In a direction opposite to Earth's gravitational force.
d)
quick and deliberate.
55.

Which is the correct unit for work?

a)

Joules

b)

Newton

c)

meter

d)

Watts

56.

It took 500 Newtons of force to push a car four meters. How much work was done?

a)

2000 J

b)

125 J

c)

0.008 J

d)

500 J

57.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
58.
What is the formula for work?
a)
Force = work x distance
b)
Distance = force x work
c)
Work = force x distance
d)
Work = force x mass
59.
If a lion drags his prey 10 meters to his den doing 500 joules of work, how much force did he use?
a)
50 Newtons
b)
500 Joules
c)
50,000 Newtons
d)
10 Newtons
60.
If a boulder is lifted by a forklift a distance of 10 meters with a force of 30 Newtons. How much work is being done?
a)
.333 Joules
b)
3 Joules
c)
300 Joules
d)
60 Joules
61.
Which of the following is an example of work being done?
a)
Teacher sitting in a chair
b)
Book resting on desk
c)
Keys hanging from a key chain
d)
A ball being rolled on the floor
62.
You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?
a)
54 N
b)
6.0 J
c)
54 J
d)
27 J
63.
A force of 100 newtons was necessary to lift a rock.  A total of 150 joules of work was done.  How far was the rock lifted?
a)
1.5m
b)
15,000 m
64.

One joule equals the amount of work that is done when 1N of force moves an object over a distance of

a)

1cm.

b)

1m.

c)

1 km.

d)

none of the above

65.

If you apply 20 Newtons of force to do 60 joules of work on an object, the object moves a distance of (a)   metres.

66.

Work equals force multiplied by

(a)  

67.

If you do 40 joules of work on an object to move it 2 metres, you apply Newtons of force to the object.

(a)  

68.

Clarissa helps her mum put the lawn mower in the back of her mum's truck. They lift the mower up from the ground to the tray of the truck, which is 1.1 metres above the ground. If she does 528 joules of work climbing into the tray, how much does she weigh?

a)

500 N

b)

480 N

c)

395 N

d)

400 N

69.

Jason pushes a lawnmower 95 metres with a force of 160N. How much work has he done?

a)

1520 J

b)

850 J

c)

8500 J

d)

5800 J

e)

15200 J

70.
A girl carries a bag. 
a)
Work
b)
No Work
71.
True or False: As a man pushes a refrigerator up a ramp, work is done.
a)
True
b)
False
72.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
73.
A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?
a)
16.67 watts
b)
50 watts
74.
How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?
a)
70 watts
b)
1750 watts
75.
What is the power of a kitchen blender if it can perform 3,750 joules of work in 15 seconds?
a)
56, 250 watts
b)
250 watts
76.
How much work is done using a 500 watt microwave oven for 5 minutes?
a)
150,000 J
b)
2500 J
77.
How much work is done using a 60 watt light bulb for 1 hour?
a)
60 J
b)
216,000 J
78.
The rate at which work is done.
a)
Joules
b)
Power
c)
Watts
d)
Newtons
79.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
80.

What is the correct unit for power?

a)

Watt

b)

Joules

c)

Newtons

d)

seconds

81.

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

a)

250 W

b)

0.004 W

c)

56,250 W

d)

25 W

82.

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

a)

70 W

b)

3.5 W

c)

7 W

d)

350 J

83.
A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?
a)
16.67 watts
b)
50 watts
84.
How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?
a)
70 watts
b)
1750 watts
85.
What is the difference between calculating power and work?
a)
Power takes into account the time it takes to complete a task
b)
Work takes into account the time it takes to complete a task
c)
Power is force/area
d)
Work is force/area
86.

If a runner's power is 400 W as she runs, how much energy does she convert into other forms in 10.0 minutes?

a)

4000 J

b)

40 J

c)

240,000 J

d)

6.67 J

87.

One horsepower is a unit of power equal to 746 W. How much energy can a 150-horsepower engine transform in 10 s?

a)

7460 J

b)

111,900 J

c)

1,119,000 J

d)

4.97 J

88.
Which of these is a measurement of power?
a)
100 joules
b)
100 watts
c)
100 meters per second
d)
100 hertz
89.

What would you solve for if given time and work?

a)

power

b)

force

c)

distance

d)

work

90.

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

a)

Person A

b)

Person B

91.

In order to do 20.5 J of work in 0.46 s, how much power is required?

a)

44.57 W

b)

9.43 W

c)

32.35 W

d)

11.56 W

92.

How much power is required to do 40.2 J of work in 3.3 s?

a)

12.18 W

b)

132.66 W

c)

43.5 W

d)

0.08 W

93.

How much work is done when 114 W of power is used over 0.62 s?

a)

70.68 J

b)

183.87 J

c)

57.62 J

d)

No work is done.

94.
W = 500 Joules 
t = 25 seconds
P = ???
a)
0.05 W
b)
20 W
c)
12500 W
d)
2000 W
95.

A runner exerts 240,000 J when she runs for 600 min. What is the runner's power?

a)

400 W

b)

600 W

c)

400 J

d)

600 J

96.

The power rating of an electric lawnmower is 3000 W. If the lawnmower is used for 60 sec, how many joules of work can it do?

a)

270,000 W

b)

270,000 J

c)

180,000 J

d)

33.3 W

97.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)
30 watts
b)
3 watts
c)
120 watts
d)
270 watts
98.

If a light bulb is switched on for 20 s and it consumes 2400 J of electrical energy then it's power is

a)

60 W

b)

70 W

c)

80 W

d)

120 W

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