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Energy Unit Exam Review

Total questions: 74

Worksheet time: 2hrs 38mins

Name
Class
Date
1.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
2.
what type of energy is stored in a battery?
a)
electrical
b)
chemical
c)
thermal
d)
mechanical
3.
Solar Energy is transferred to _____ Energy.
a)
Mechanical
b)
Solar
c)
Sound
d)
Electrical
4.
Electrical Energy is transferred to _____ Energy.
a)
Thermal
b)
Solar
c)
Electrical
d)
None
5.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
6.
__________ is stored energy. 
a)
Potential
b)
Kinetic
c)
None of the above 
d)
All of the above 
7.
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 
8.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
9.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
10.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
11.
Which point has the most potential energy?
a)
G
b)
f
c)
b
d)
a
12.
Where would a person have to be located to have the minimum gravitational potential energy?
a)
up on the roof
b)
down in the basement
c)
in the middle
d)
outside
13.
A 0.40 kilogram bird is flying at a constant speed of 8.0 m/s. What is the bird's kinetic energy ?
a)
3.2 J
b)
4.2 J
c)
2.0 J
d)
12.8 J
14.

A 2600 kilogram car is moving at a speed of 25 m/s. How much kinetic energy does the car have?

a)

427,500 J

b)

237,500 J

c)

812,500 J

d)

537,500 J

15.

A 60.0 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?

a)

43982.4 J

b)

63982.3 J

c)

43962.4 J

d)

83942.4 J

16.
A pitcher throws a 0.145 kg baseball at a velocity of 30.0m/s. How much kinetic energy does the ball have?
a)
65.35 J
b)
87.25 J
c)
23.45 J
d)
65.25 J
17.
What is the unit used to measure work?
a)
Joule
b)
Watt
c)
Newton
d)
Pascal
18.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
19.
If W=Fd
Then how much work is done if it takes 20N to move a box 10 meters
a)
0
b)
2
c)
20
d)
200
20.
The _______ is the SI unit of energy.
a)
watt
b)
joule
c)
ampere
d)
volt
21.
If you exert a force of 10.N to lift a box over 1 m how much work do you do.
a)
11
b)
10
c)
5
d)
20
22.
If you do 40 joules of work lifting a 10N box, how high is the shelf you move it to.
a)
400m
b)
40m
c)
50m
d)
4m
23.
A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?
a)
600 J 
b)
660 J
c)
900 J 
d)
1200 J 
24.
Simple machines make work easier by increasing what?
a)
The distance over which work is done 
b)
The force needed to do work 
c)
The time required to do work
d)
The acceleration of a massive object 
25.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
26.
You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?
a)
The mass of the box
b)
The slope of the ramp 
c)
The direction the box moved
d)
How long the task took
27.
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
28.
You move an 8-newton weight five meters in 4 seconds. How much power have you generated?
a)
160 watts
b)
10 watts
c)
6.4 watts
d)
17 watts
29.
Which of the following would produce the most power?
a)
A mass of 10 kilograms lifted 10 meters in 10 seconds 
b)
A mass of 10 kilograms lifted 10 meters in 5 seconds
c)
A mass of 5 kilograms lifted 10 meters in 5 seconds
d)
A mass of 5 kilograms lifted 5 meters in 10 seconds
30.

What class lever is a seesaw?

a)

1st

b)

2nd

c)

3rd

31.

What class lever is a pair of scissors?

a)

1st

b)

2nd

c)

3rd

32.

What class lever is a pair of pilers?

a)

1st

b)

2nd

c)

3rd

33.

What class lever is a wheelbarrow?

a)

1st

b)

2nd

c)

3rd

34.

What class lever are tongs?

a)

1st

b)

2nd

c)

3rd

35.

What class lever is a fishing rod?

a)

1st

b)

2nd

c)

3rd

36.

What class lever does this picture show?

a)

1st

b)

2nd

c)

3rd

37.

What class lever does this picture show?

a)

1st

b)

2nd

c)

3rd

38.

What class lever does this picture show?

a)

1st

b)

2nd

c)

3rd

39.
What is a simple machine?
a)
a device that has only one working motor
b)
a device that makes work easier
c)
a device that makes more work for a job
d)
device that is made up of two or more machines
40.
A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  
a)
wedge
b)
screw
c)
lever
d)
inclined plane 
41.
An inclined plane wrapped around a rod forms this simple machine 
a)
lever
b)
pulley
c)
screw
d)
wedge 
42.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum 
43.
The "fixed point" on which a lever rests and, or pivots is known as which of the following?
a)
screw
b)
wheel and axle
c)
see saw 
d)
fulcrum 
44.
Stairs are a 
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
45.
A _______ is a rope or chain wrapped around a wheel. 
a)
wedge 
b)
lever 
c)
pulley 
d)
screw
46.
Is work being done if I am trying to pick up a box but can not lift it?
a)
yes
b)
no
47.
On a roller coaster, where is maximum potential energy?
a)
At the bottom of a big hill
b)
When going around a corner
c)
When going upside down
d)
At the top of a big hill
48.
On a roller coaster, where is maximum kinetic energy?
a)
At the bottom of a big hill
b)
When going around a corner
c)
When going upside down
d)
At the top of a big hill
49.
How does heat always transfer?
a)
from cold to hot
b)
from hot to cold
c)
from liquid to solid
d)
from gas to liquid
50.
What type of heat transfer does this picture represent? (pot touching burner)
a)
radiation
b)
conduction
c)
convection
d)
sunshine
51.
What type of heat transfer does this picture represent?
a)
radiation
b)
conduction
c)
convection
d)
sunburns
52.
Warm air rises and the cool air sinks demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
d)
Insolation 
53.
When the 2nd story of a house is warmer than the 1st floor of a house is heat transfer through 
a)
conduction
b)
convection
c)
radiation
d)
thermal equilibrium
54.
The sun warming your skin is an example of heat transfer through 
a)
conduction
b)
convection
c)
radiation
d)
thermal electricity
55.
Which example below is an example of conduction?
a)
Boiling macaroni
b)
The attic is warmer than the basement
c)
The Sun heating the Earth
d)
Touching hot sand with your feet
56.
Which example below is an example of convection?
a)
Standing on a hot metal bridge
b)
The attic is warmer than the basement
c)
The Sun heating the Earth
d)
Touching hot sand with your feet
57.
Which example below is an example of radiation?
a)
Standing on a hot metal bridge
b)
The attic is warmer than the basement
c)
The Sun heating the Earth
d)
Touching hot sand with your feet
58.
Which sentence explains why a cold metal spoon placed in a pot of boiling water becomes hot?
a)
Thermal energy is transferred from the spoon to the water.
b)
Thermal energy is transferred from the water to the spoon.
c)
Thermal energy in the water is transformed into kinetic energy in the spoon.
d)
Thermal energy in the spoon is transformed into kinetic energy in the water.
59.

An object has 12.4 J of potential energy and 23.5 J of kinetic energy. What is the mechanical energy of the system?

a)

11.1 J

b)

1.895 J

c)

35.9 J

d)

291.4 J

60.

An 80 kg skier stands at the top of a 40 meter slope. What is her gravitational potential energy before she skies down the slope?

a)

3200 J

b)

31,360 J

c)

15,680 J

d)

19.6 J

61.

What is the kinetic energy of an 9 kg bowling ball rolling at 3.30 m/s?

a)

29.7 J

b)

323.4 J

c)

49.005 J

d)

14.85 J

62.

If two rocks are launched through the air at the same speed, but one has twice as much mass as the other, how do their kinetic energies compare?

a)

The kinetic energy of the two rocks is the same because they have the same speed

b)

The rock with the greater mass will only move a small distance and then fall straight to the ground

c)

The two rock could not have the same speed if they have different masses

d)

The rock with the greater mass has more kinetic energy than the rock with less mass even though they are traveling at the same speeds because both mass and speed affect kinetic energy.

63.
How can you determine the mechanical advantage of a pulley system?
a)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 1 from this number.
b)
Count the number of rope/cable segments on each side of the pulleys without including the free end.
c)
Count the number of rope/cable segments on the central pulleys.
d)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 10 from this number.
64.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
65.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

66.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
67.

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?

a)

1

b)

10

c)

100

d)

1000

68.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

69.
Which 2 letters have the most kinetic energy
a)
W & Y
b)
X & Z
70.

Which ramp will require the least amount of force?

a)

A

b)

B

c)

C

d)

D

71.
Why is no machine 100% efficient?
a)
some of the input energy is converted to mechanical energy in the environment
b)
some of the input energy is converted to chemical energy in the environment
c)
some of the input energy is converted to heat energy in the environment
d)
All machines can be 100% efficient
72.

What is the efficiency of a machine if you do work on a machine at a rate of 1500W and the machine does work at a rate of 300W?

a)

50%

b)

20%

c)

5%

d)

25%

73.

A student who weighs 500 Newton's climbed the stairs from the first floor to the third floor, 15 meters above, in 20 seconds. What was her power output?

a)

375 Watts

b)

25 Watts

c)

300 Watts

d)

33 Watts

74.

What is the efficiency of this machine?

a)

10%

b)

30%

c)

66%

d)

92%

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