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Worksheets

Work, energy, power, efficiency

Total questions: 68

Worksheet time: 1hrs 1mins

Name
Class
Date
1.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
2.
If you push a cart with a force of 60 N for 2 m, how much work have you done?
a)
120 J
b)
30 J
c)
120 N 
d)
30 N
3.
Calculate the work done by a 47 N force pushing a pencil 0.26 m.
a)
12.2
b)
13.5
c)
12.8
d)
11.2
4.

Work of 2000 J is required to push an object 1,500 m. What is the force?

a)
2.5 N
b)
1.3 N
c)
1.6 N
d)
12 N
5.

Two movers applied a total force of 350 N to push chest up a ramp into a truck. If the work that they did 1,400 J, calculate the height of the ramp?

a)

4 m

b)

3 m

c)

2 m

d)

1 m

6.
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
7.

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

8.

How far does a 18,210.9 newton car go if it it exerts 91,054.5 watts of power in 20 seconds.

a)

100 meters

b)
2500 meters
c)
1000 meters
d)
500 meters
9.
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
10.

This weight lifter required 1029.7 newtons of force to bring the weights to a height of approximately 2.31 m in 9 seconds. How much power did he have?

a)

264 Watts

b)

1029 Watts

c)

2,377 Watts

d)

4,009 Watts

11.

If a 725.7 N racer took 798 s to climb the 320 m, how power did she have?

a)

291 Watts

b)

281 Watts

c)

317 Watts

d)

313 Watts

12.

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

13.

If 360 J of work is needed to move a crate a distance of 4 m, what is the weight of the crate?

a)

90 N

b)

720 N

c)

90 kg

d)

720 W

14.

A runner exerts 240,000 J when she runs for 10 min. What is the runner's power?

(convert time to seconds)

a)

400 W

b)

600 W

c)

300 W

d)

24,000 W

15.

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

16.

ODD ONE OUT.

a)

Elastic Potential Energy

b)

Gravitational Potential Energy

c)

Heat Potential Energy

d)

Electric Potential Energy

17.
The law of conservation of energy states that when one form of energy is converted into another,
a)
energy is destroyed in the process
b)
no energy is destroyed in the process
c)
energy is created in the process
d)
some amount of energy cannot be accounted for
18.
In energy transformations, "wasted energy" usually takes what form?
a)
heat
b)
chemical energy
c)
light
d)
sound waves
19.

What kind of energy does an object possess when it's resting on top of the hill?

a)

Potential Energy

b)

Chemical Energy

c)

Kinetic Energy

d)

All of the above

20.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

21.

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

a)

5%

b)

50%

c)

55%

d)

100%

22.
What type of device might this Sankey be about?
a)
A very efficient LED light bulb
b)
A very inefficient incandescent light bulb
c)
A coal power plant
d)
A wind turbine
23.
What energy transformation occurs from a light bulb? 
a)
Electrical energy = kinetic energy + potential energy 
b)
Electrical energy = electrical energy 
c)
Electrical energy = chemical energy 
d)
Electrical energy = light energy + thermal energy 
24.

An engine does 300 J of work in 10 seconds. How much power did it use?

a)

3000 N

b)

3000 W

c)

30 W

d)

30 J

25.
Where does most of the energy go for this transformation.
a)
heat
b)
electrical
c)
light
d)
joules
26.

The energy efficiency shown in this diagram is:

a)

About 10%.

b)

About 30%.

c)

About 60%.

d)

Impossible to tell.

27.
Which fraction best describes, of the part of the gasoline that is put into a car, that actually makes the car move. 
a)
4/10
b)
1/4
c)
2/4
d)
3/5
28.

Which of the following is NOT an example of work being done?

a)

Lifting a weight above your head

b)

Carrying a box up the stairs

c)

Pushing furniture across the room

d)

Pushing downward on an unmoving table

29.

Power is defined as

a)

How much work is done

b)

The rate at which work is done

c)

How many things are plugged into an outlet

d)

The rate at which energy is used

30.

If a car weighs 3000 N and drives a distance of 10 m in 2 seconds, how much power does it use?

a)

1,500 J

b)

60,000 W

c)

15,000 W

d)

6,000 J

31.

Efficiency is a measure of

a)

how much work is done per second

b)

how much work is output versus to how much work is input

c)

how much power is used per second

d)

how much power is output versus how much power is input

32.

What is the efficiency of a car that has enough fuel to drive 600 miles, but only actually drives 150 miles?

a)

25%

b)

4%

c)

400

d)

.25

33.

1. Marcy takes a spring of spring constant 20 N/m. The spring extends by 30 cm. A toy car is placed in front of the spring so that when the spring is released it will hit the car and transfer all the stored energy into the car. The car has a mass of 10 g.


How much energy is stored in the spring?

[3 marks]

How much kinetic energy does the car have once the spring is fully compressed again? [1 mark]


How fast is the car travelling at this point?

Give a unit. [3 marks]

4 lines
34.

1. A games console with a power rating of 130 W is played with for 4 hours a day.


(a)

Over a week, how much energy

does it use? [4 marks]

The games console uses mains voltage.

How much current is going through

it? [2 marks]

The cables connecting the games console to the plug heat up when it is on.

Why is this? [3 marks]

4 lines
35.

A dude drags a car mass M across a rough floor with a force of magnitude directed at an angle theta of above the horizontal as shown. If he drags the crate for a distance D, which of the following is equal to the work by the force of friction?

a)

−Fcos⁡θD-F\cos\theta D

b)

−μmgD-\mu mgD

c)

−μ(mg−Fsin⁡θ)D-\mu\left(mg-F\sin\theta\right)D

d)

−μ(mg+Fcos⁡θ)D-\mu\left(mg+F\cos\theta\right)D

36.

How much wasted energy is there in this Sankey diagram?

a)

100 J

b)

75 J

c)

50 J

d)

25 J

37.

If a light bulb with an efficiency of 80% lights up the room and 16 J of energy is converted to light energy and 4 J of energy is lost to thermal energy. What is the total energy in the system?

a)

80%

b)

4 J

c)

20 J

d)

16 J

38.

An engine has an inout of 5000 W. The useful output is 4000W. Calculate its percentage efficiency.

a)

90%

b)

80%

c)

75%

d)

85%

39.

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

a)

5%

b)

50%

c)

55%

d)

100%

40.
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
41.
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
42.

A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.

a)

almost all kinetic energy

b)

almost all potential energy

c)

mostly kinetic energy

d)

some kinetic and some potential energy

43.

At which point on the roller coaster is the kinetic energy at its maximum?

a)

A

b)

B

c)

C

d)

D

44.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
45.

A spring is compressed by a force F against a wall as shown. Which of the following describes the sign of work done by the spring as it is being compressed?

a)

The spring does positive work since it is gaining potential energy.

b)

The spring does zero work since all the work is done by force F.

c)

The spring does negative work since it applies a force against the direction of its compressing motion.

d)

The spring works part-time at Chik Fil-A.

46.
a)

A

b)

B

c)

C

d)

D

47.
a)

A

b)

B

c)

C

d)

D

48.
a)

A

b)

B

c)

C

d)

D

49.
a)

A

b)

B

c)

C

d)

D

50.
a)

A

b)

B

c)

C

d)

D

51.
a)

A

b)

B

c)

C

d)

D

52.
a)

A

b)

B

c)

C

d)

D

53.
a)

A

b)

B

c)

C

d)

D

54.
a)

A

b)

B

c)

C

d)

D

55.
a)

A

b)

B

c)

C

d)

D

56.
a)

A

b)

B

c)

C

d)

D

57.
a)

A

b)

B

c)

C

d)

D

58.
a)

A

b)

B

c)

C

d)

D

59.
a)

A

b)

B

c)

C

d)

D

60.
a)

A

b)

B

c)

C

d)

D

61.

Define electricity

a)

Flow of charged particles

b)

Flow of hot water

c)

Flow of uncharged particles

d)

Lightning

62.

What is produced when wires are rotated around a magnet?

a)

Current

b)

Resistance

c)

Gas

d)

Static

63.

What is produced by nuclear power plant towers?

a)

Pollution

b)

Carbon Dioxide

c)

Steam (water)

d)

Radioactive gases

64.

What is produced by nuclear power plant towers?

a)

Pollution

b)

Carbon Dioxide

c)

Steam (water)

d)

Radioactive gases

65.

What is a turbine?

a)

A device which rotates and drives a generator

b)

Rotor blades on a windwill

c)

The wings of an aeroplane

d)

A solar panel

66.

What energy transfer is harnessed by a hydroelectric dam

a)

GPE

b)

Thermal

c)

Elastic

d)

Radiant

67.

800kg of water are in a lake 500 metres high. How much GPE does this water hold?

a)

4 mJ

b)

4000 J

c)

4 J

d)

400 N

68.

Assume this water can be converted to electricity at 50% efficiency, how many Joules of electricity can be produced?

a)

4 mJ

b)

1 mJ

c)

2 mJ

d)

3 mJ

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