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Work Power & Energy

Total questions: 32

Worksheet time: 32mins

Name
Class
Date
1.

Work is measured in the same units as:

a)

Force

b)

Momentum

c)

Mass

d)

Energy

2.

Which term is the unit of Power?

a)

Joule

b)

Newton

c)

Watt

d)

Hertz

3.

A 2.2 Kg mass is pulled by a 30 N force through a distance of 5 meters. What amount of work is done?

a)

11 J

b)

66 J

c)

150 J

d)

330 J

4.

A force of 80 N pushes a 50 kg objects across a level floor for 8 meters. The work done is...

a)

10 J

b)

400 J

c)

640 J

d)

3920 J

5.

A 2 Kg mass is pushed along a horizontal, friction-less surface by a 3 N force that is parallel to the surface. How much gravitational potential energy would be gained by the mass if it is moved 2 meters horizontally?

a)

0 J

b)

6 J

c)

40 J

d)

4 J

6.

The work done in lifting an object must result in an increase in the object’s...

a)

Gravitational Potential Energy

b)

Kinetic Energy

c)

Heat Energy

d)

Electrical Energy

7.

If a mass in lifted the same vertical distance (same work done) but the time is increased, the power...

a)

Decreases

b)

Increases

c)

Remains the same

8.

As the power of a machine is increased, the time required to move an object a fixed distance...

a)

Decreases

b)

Increases

c)

Remains the same

d)

Not enough information given

9.

An electric motor lifts an object that weighs 98 N a distance of 100 meters in 10 seconds. The power used by the motor is...

a)

9.8 W

b)

98 W

c)

980 W

d)

9800 W

10.

If the velocity of an automobile is doubled, its kinetic energy...

a)

Decreases to one-half

b)

doubles

c)

decreases to one-fourth

d)

quadruples (four times)

11.

As a mass is moved parallel (sideways) to the surface of the Earth, its gravitational Potential Energy

a)

Decreases

b)

Increases

c)

Remains the same

d)

Only Santa knows the answer

12.

How much work is required to pull a sled 5 meters if you use 60 N of force.

a)

300 J

b)

12 J

c)

0.083 J

d)

0 J

13.

Amy uses 20 N of force to push a lawn mower 10 meters. How much work does she do?

a)

20 J

b)

2 J

c)

200 J

d)

0 J

14.
Which point has the greatest potential energy (GPE)?
a)
A
b)
G
c)
D
d)
C
15.
A runner has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?
a)
14.4 kg
b)
1400 kg
c)
144 kg
d)
360 kg
16.

which point has the most kinetic energy

a)

A

b)

B

c)

C

d)

F

17.
A car starts from rest and accelerates uniformly at 5 m/s2. How long (time) will it take the car to reach a velocity of 50 m/s? 
a)
250 s
b)
0.1 s
c)
10 s
d)
55 s
18.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
19.
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 
20.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
21.

If Keegan does 508 J of work pushing a cart 29 m, how much force did he apply?

a)

0.057 N

b)

537 N

c)

14,732 N

d)

17.52 N

22.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
23.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
24.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
25.

Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs?

a)

8.5 J

b)

45 J

c)

7.5 J

d)

22.5 J

26.
Unit for Force
a)
Joules
b)
Newton
c)
Meter
d)
Watt
27.
What three things affect the amount of potential energy of an object?
PE=mgh
a)
mass, gravitational acceleration and height
b)
mass, velocity and force
c)
power, force and gravitational acceleration 
d)
watts, joules and meters per second
28.
Unit for Energy
a)
Joules
b)
Newton
c)
Meter
d)
Watt
29.
The rate at which work is done is called
a)
Force
b)
Effiency
c)
Power
d)
Energy
30.
If you increase the height of an object, its potential energy
a)
Becomes Larger
b)
Becomes Smaller
c)
Negative
d)
Remains the same 
31.
 What is the kinetic energy of the rock in the picture?
a)
0 J
b)
50 J
c)
5000 J
d)
49,000 J
32.
 What is the potential energy of the rock in the picture?
a)
2 J
b)
95J
c)
150 J
d)
93,100J

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