wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

dotun and deji

Total questions: 168

Worksheet time: 2hrs 41mins

Name
Class
Date
1.
When is the potential energy the greatest in a roller coaster?
a)
a. at the bottom of the first hill
b)
b. at the top of the first hill
c)
c. at the top of the second hill
d)
d. at the bottom of the second hill
2.

When you eat fruits and vegetables, chemical bonds are releasing stored energy, this is...

a)

a. thermal energy

b)

b. sound energy

c)

c. electrical energy

d)

d. chemical energy

3.
After an energy conversion, you end up with the same total amount of energy as the original amount of potential energy. Which of the following laws explains this rule?
a)
a. law of energy changes
b)
b. law of conservation of energy
c)
c. law of power and energy
d)
d. law of potential energy
4.
Where is the potential energy the greatest?
a)
A
b)
B
c)
C
d)
D
5.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
6.
What kind of energy is in a rock at the edge of a cliff?
a)
Potential
b)
Kinetic
7.
What kind of energy is in a moving skateboard?
a)
Potential
b)
Kinetic
8.
"Energy can be transformed from one form into another or transformed from one region or another, but energy cannot be created or destroyed."
Which law is this?
a)
Law of Conservation of Mass
b)
Newton's Second Law
c)
Law of Conservation of Energy
d)
Newton's Third Law
9.
Can energy be created or destroyed?
a)
Yes
b)
No
10.
A girl turned the light off and went to bed.  She remembered she had accidentally left her glass of ice water on the counter.  When she got up the next morning, the ice had melted. What form of energy caused the ice to melt?
a)
Sound energy
b)
Light energy
c)
Thermal energy
d)
Mechanical energy
11.

As an object falls, what happens to its kinetic energy?

a)

Increases

b)

Decreases

c)

Stays the same.

d)

Need more information

12.

Where does your body get its energy?

a)

From Sleep

b)

From Food

c)

From the Sun

d)

From Rainbows

13.

What is the unit of energy

a)

N

b)

kg

c)

J

d)

W

14.

Hot objects have energy in this energy store

a)

Thermal

b)

Elastic Potential

c)

Gravitational Potential

d)

Chemical

15.

A roller coaster at the top of a hill has energy in this energy store.

a)

Gravitational Potential

b)

Thermal

c)

Elastic Potential

d)

Chemical

16.

Food, fuels and batteries have energy in this energy store

a)

Chemical

b)

Thermal

c)

Gravitational Potential

d)

Elastic

17.

A stretched rubber band has energy in this energy store

a)

Magnetic

b)

Electrostatic

c)

Elastic

d)

Nuclear

18.

Two magnets close together have energy in this energy store.

a)

Chemical

b)

Elastic

c)

Magnetic

d)

Gravitational Potential

19.

Two negatively charged particles which are close together have energy in this energy store

a)

Electrostatic

b)

Magnetic

c)

Nuclear

d)

Elastic

20.

Energy stored in the nucleus of an atom

a)

Nuclear

b)

Magnetic

c)

Electrostatic

d)

Chemical

21.

Every moving object has energy in this energy store

a)

Kinetic

b)

Elastic

c)

Chemical

d)

Nuclear

22.

Energy which is transferred by a force moving an object through a distance

a)

Mechanically

b)

Electrically

c)

By Radiation

d)

By Heating

23.

Energy which is transferred by charges moving due to a potential difference (voltage)

a)

Mechanically

b)

Electrically

c)

By Radiation

d)

By Heating

24.

Energy which is transferred as a wave, for example light.

a)

Mechanically

b)

Electrically

c)

By Radiation

d)

By Heating

25.

Energy which is transferred due to temperature difference caused electrically or by a chemical reaction.

a)

Mechanically

b)

Electrically

c)

By Radiation

d)

By Heating

26.

Energy is measured in.....

a)

kilograms

b)

metres per second

c)

Joules

d)

metres

27.

Which energy store is missing? Magnetic, electrostatic, nuclear, gravitational, elastic, thermal, chemical and....

a)

heating

b)

lighting

c)

kinetic

d)

sounding

28.

Energy cannot be created or destroyed, it can only be _________ between the stores

a)

removed

b)

dissipated

c)

transferred

d)

stored

29.

When a kettle boils, energy is transferred from the electrostatic store to the _________________ energy store.

a)

chemical

b)

kinetic

c)

elastic

d)

thermal

30.

On a rollercoaster, the gravitational potential is at its highest/lowest when it reaches the top of the track

a)

highest

b)

lowest

31.

On a rollercoaster, gravitational energy is transferred to which other two energy stores?

a)

thermal and electrostatic

b)

kinetic and chemical

c)

kinetic and nuclear

d)

thermal and kinetic

32.

Work done is another way of saying energy is transferred. What are the units of measurement fir work done?

a)

kilograms

b)

Joules

c)

Degrees celcius

d)

Joules per kilogram degrees celcius

33.

What is the equation to work out kinetic energy?

a)

mass x velocity

b)

0.5 x mass x velocity

c)

0.5 x mass x velocity3

d)

0.5 x mass x velocity2

34.

The mass of a car is 2500kg. It travels at 20m/s. Calculate the kinetic energy.

a)

500,000J

b)

600,000J

c)

400,000J

d)

700,000J

35.

What is the equation to work out gravitational potential energy?

a)

mass x gravitational field strength x height

b)

0.5 x mass x velocity2

c)

mass x height

d)

height x gravitational field strength

36.

A book has a mass of 2.7kg. It is on a shelf that is 2.4m above the ground. The gravitational field strength is 10N/kg. Calculate the gravitational potential energy:

a)

64.7

b)

64.8

c)

64.9

d)

65.0

37.

What is the unit of measurement for mass?

a)

grams

b)

kilograms

c)

metres

d)

metres per second

38.

A car moves faster? Which energy store increases?

a)

Gravitational Potential Energy

b)

Kinetic Energy

c)

Thermal Energy

d)

Kinetic Energy

39.

A ball is elevated some distance off the ground. If it has a mass of 3 kg and a potential energy of 90 J, how high off the ground is the ball?

a)

2700 m

b)

27 m

c)

900 m

d)

3 m

40.

Which type of energy is increased when a book is lifted high up onto a shelf

a)

Kinetic

b)

Thermal

c)

Nuclear

d)

Gravitational potential

41.

Which type of energy does a car on the motorway have a lot of?

a)

Kinetic

b)

Thermal

c)

Nuclear

d)

Gravitational potential

42.

Which type of energy does an ice cube NOT have a lot of?

a)

Kinetic

b)

Thermal

c)

Nuclear

d)

Gravitational potential

43.

A bunsen burner converts (a)   energy into thermal energy?

44.

What is the equation linking gravitational field strength, gravitational potential energy and height?

a)

Gravitational field strength = mass x gravitational potential energy x height

b)

Gravitational potential energy = mass x gravitational field strength x height

c)

Height = mass x gravitational field strength

45.

What are the units of gravitational field strength?

a)

Newtons (N)

b)

Kilograms (kg)

c)

Kilograms per newton (kg/N)

d)

Newtons per kilo (N/kg)

46.

Food, batteries, fuel and muscles store which energy type?

a)

Elastic potential energy

b)

Kinetic energy

c)

Thermal energy

d)

Chemical energy

47.

What is the equation linking energy transferred, power and time?​

a)

Power = energy x time

b)

Power = energy / time

c)

Energy = time / power

48.

Which energy store is linked with springs and catapults?

a)

Nuclear energy

b)

Light energy

c)

Kinetic energy

d)

Elastic potential energy

49.

Which two energy stores change depending on the position of an object?

a)

Electrical energy

b)

Elastic potential energy

c)

Gravitational potential energy

d)

Chemical energy

50.

What is the law of conservation of energy?

a)

Energy is created and transferred

b)

Energy is created and stored

c)

Energy is stored and destroyed

d)

Energy is stored and transferred

51.
Which skier has the greatest kinetic energy?
a)
Skier A
b)
Skier B
c)
Skier C
d)
Skier D
52.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

53.

What energy transfer happens when someone plays the drums?

a)

Sound to kinetic

b)

Electrical to kinetic

c)

Electrical to chemical

d)

Kinetic to sound

54.

What type of energy is stored in a wind up toy?

a)

Kinetic energy

b)

Elastic potential energy

c)

Thermal energy

d)

Friction

55.

Elastic Potential energy =

a)

1/2mv2

b)

1/2kx2

c)

mgh

d)

Fd

56.

Identify the energy transfer

a)

electrical to chemical to light

b)

kinetic to potential

c)

chemical to electrical to light

d)

light to sound

57.
Energy of motion is which type of energy?
a)
Potential
b)
Kinetic
c)
Sound
d)
Gravitational
58.
When plants convert the sun's energy into food, which type of energy is it?
a)
kinetic
b)
chemical
c)
thermal
d)
radiant
59.
What kind of energy is represented in this picture?
a)
Thermal
b)
Potential
c)
Nuclear
d)
Mechanical
60.

A hot drink has...

a)

Kinetic Energy

b)

Heat Energy

c)

Thermal Energy

d)

Nuclear Energy

61.

A cyclist at the top of a hill has...

a)

Kinetic Energy

b)

Chemical Potential Energy

c)

Elastic Potential Energy

d)

Gravitational Potential Energy

62.

Humans get their energy from...

a)

Chemical Potential Energy

b)

Thermal Energy

c)

Kinetic Energy

d)

Nuclear Energy

63.

Energy Stored in an atoms nucleus is..

a)

Atomic Energy

b)

Electrostatic Energy

c)

Nuclear Energy

d)

Elemental Energy

64.

Energy stored in objects being stretched or squashed...

a)

Elastic Potential Energy

b)

Kinetic Energy

c)

Chemical Energy

d)

Thermal Energy

65.
When an object is moved to a higher position, what name is given to the energy it then stores?
a)
Gravitational Potential
b)
Elastic
c)
Height
d)
Kinetic
66.
What type of energy is stored in food and fuel?
a)
Chemical
b)
Thermal
c)
Potential
d)
Calories
67.
Which of the following is the name for the energy stored in atoms?
a)
Potential
b)
Thermal
c)
Nuclear
d)
Explosive
68.

The energy going into an energy transfer is always equal to the energy coming out. True or False?

a)

True

b)

False

69.
What type of energy is in this picture?
a)
Kinetic
b)
Potential
c)
Chemical
d)
Sound
70.
Energy of motion is which type of energy?
a)
Potential
b)
Kinetic
c)
Sound
d)
Gravitational
71.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
72.
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
73.
According to which law of energy, energy can't be created or destroyed?
a)
First law of motion
b)
The law of tacos
c)
Laws of Energy
d)
law of conservation of energy
74.

Type of energy?

a)

Electrical

b)

Chemical

c)

Mechanical

d)

Nuclear

e)

Thermal

75.

Type of energy?

a)

Electrical

b)

Chemical

c)

Mechanical

d)

Nuclear

e)

Thermal

76.

Type of energy?

a)

Electrical

b)

Chemical

c)

Mechanical

d)

Nuclear

e)

Thermal

77.

Which image shows chemical energy transforming into mechanical energy, then from mechanical into kinetic, sound and thermal energy?

a)
b)
c)
d)
78.

The picture demonstrates chemical energy transforming into ...(pick 3)

a)

radiant energy

b)

sound energy

c)

thermal energy

d)

kinetic energy

e)

potential energy

79.

A hot drink has lots of ....

a)

Kinetic Energy

b)

Heat Energy

c)

Thermal / Heat Energy

d)

Nuclear Energy

80.

A cyclist at the top of a hill has...

a)

Kinetic Energy

b)

Chemical Potential Energy

c)

Elastic Potential Energy

d)

Gravitational Potential Energy

81.

Humans get their energy from...

a)

Chemical Energy

b)

Thermal Energy

c)

Kinetic Energy

d)

Nuclear Energy

82.

Energy stored in objects being stretched or squashed...

a)

Elastic Potential Energy

b)

Kinetic Energy

c)

Chemical Energy

d)

Thermal Energy

83.
When an object is moved to a higher position, what name is given to the energy it then stores?
a)
Gravitational Potential
b)
Elastic
c)
Height
d)
Kinetic
84.
What type of energy is stored in food and fuel?
a)
Chemical
b)
Thermal
c)
Potential
d)
Calories
85.

The energy going into an energy transfer is always equal to the energy coming out. True or False?

a)

True

b)

False

86.
Which form of energy is mostly produced in this conversion?
a)
Electrical
b)
Mechanical
c)

Thermal / Heat

d)
Sound
87.
What form of energy is also described as "energy of motion"?
a)
Potential
b)
Mechanical
c)
Kinetic
d)
Electrical
88.

What is the name for energy stored in a hot object?

a)

Thermal / Heat

b)

Potential

c)

Fire

d)

Electrical

89.
What is the unit for measuring energy?
a)
Newton
b)
Kilogram
c)
Joule
d)
Jewel
90.
If 100J of energy is transferred into a machine, how much is transferred out?
a)
It depends on the machine
b)
None of it
c)
100J
d)
Most of it
91.
A cat is sleeping on a tree branch. What type of energy does the cat possess?
a)
kinetic energy
b)
gravitational energy
c)
elastic energy
92.
Conservation of energy
a)
Energy can not be created or destroyed
b)
The energy stays in the same energy stores
c)
When energy is kept
d)
When an object stays moving at a constant speed
93.

At the bottom of the bungee jumper's first bounce, where is the energy stored?

a)

Kinetic energy store

b)

Gravitatioanl potential energy store

c)

Elastic potential energy store

d)

Disipated to the enviroment

94.
What are the energy transfers when a ball bounces?
a)
kinetic → heat → kinetic
b)
kinetic → sound → gravitational
c)
kinetic → elastic → kinetic
d)
elastic → kinetic → elastic
95.

What is the energy transfer for a sky diver?

a)

Gravitational potential -> Kinetic

b)

Gravitational potential -> Thermal

c)

Thermal -> Elastic

d)

Chemical -> Gravitational potential

96.

What is the energy transfer when the weightlifter lifts up the weights?

a)

Chemical -> Elastic

b)

Chemical -> Gravitational potential

c)

Electrical -> Chemical

d)

Magnetic -> Chemical

97.

What is the energy transfer when the weightlifter drops the weights to the floor?

a)

Gravitational potential -> Kinetic

b)

Kinetic -> Gravitational potential

c)

Chemical -> Gravitational potential

d)

Elastic -> Chemical

98.
You hit the brakes on your bike. The bike slows down and the brake pads increase in temperature.
What type of energy decreased when you hit the brakes?
a)
kinetic energy
b)
gravitational energy
c)
elastic energy
d)
thermal energy
99.

Which type of energy store is to do with food fuels and batteries?

a)

thermal

b)

kinetic

c)

chemical

d)

elastic

100.
True or false. Energy can be created and destroyed.
a)
True
b)
False
101.

What is the equation linking kinetic energy, mass and velocity?

a)

Energy = mass x velocity2

b)

Energy = mass / velocity

c)

Energy = 0.5 x mass x velocity2

d)

Energy = mass x velocity

102.

What are the units for energy?

a)

Joules (J)

b)

Watts (W)

c)

Kilograms (kg)

d)

Newtons (N)

103.

What are the units of mass?

a)

Joules (J)

b)

Watts (W)

c)

Kilograms (kg)

d)

Newtons (N)

104.

What are the units for velocity?

a)

mph

b)

m/s

c)

m/s2

d)

km/h

105.

What is the equation linking gravitational field strength, gravitational potential energy and height?

a)

Gravitational field strength = mass x gravitational potential energy x height

b)

Gravitational potential energy = mass x gravitational field strength x height

c)

Height = mass x gravitational field strength

106.

What are the units of gravitational field strength?

a)

Newtons (N)

b)

Kilograms (kg)

c)

Kilograms per newton (kg/N)

d)

Newtons per kilo (N/kg)

107.

What is the equation linking energy transferred, power and time?​

a)

Power = energy x time

b)

Power = energy / time

c)

Energy = time / power

108.

Food, batteries, fuel and muscles store which energy type?

a)

Elastic potential energy

b)

Kinetic energy

c)

Thermal energy

d)

Chemical energy

109.

Which energy store changes as height of an object changes?

a)

Kinetic energy

b)

Gravitational potential energy

c)

Elastic potential energy

d)

Sound energy

110.

Which energy store is linked with springs and catapults?

a)

Nuclear energy

b)

Light energy

c)

Kinetic energy

d)

Elastic potential energy

111.

Which two energy stores change depending on the position of an object?

a)

Electrical energy

b)

Elastic potential energy

c)

Gravitational potential energy

d)

Chemical energy

112.

What is the relationship between KE and GPE?

a)

Direct proportion - they both increase at the same rate

b)

Direct proportion - as KE increases, GPE decreases

c)

Inverse proportion - they both increase at the same rate

d)

Inverse proportion - as KE increases, GPE decreases

113.

What is the specific heat capacity of a material?

a)

The amount of energy required to heat up a material.

b)

The amount of energy required to raise the temperature of material.

c)

The amount of energy required to raise the temperature of 1kg of a material.

d)

The amount of energy required to raise the temperature of 1kg of a material by 1⁰C.

114.

Which equation is used to calculate specific heat capacity?

a)

Change in thermal energy = mass x specific heat capacity x change in temperature

b)

Change in temperature = mass x specific heat capacity x change in thermal energy

c)

Change in thermal energy = mass x specific heat capacity x temperature of a material

115.

What is the law of conservation of energy?

a)

Energy is created and transferred

b)

Energy is created and stored

c)

Energy is stored and destroyed

d)

Energy is stored and transferred

116.

What are the units of power?

a)

Joules (J)

b)

Watts (W)

c)

Kilograms (kg)

d)

Newtons (N)

117.

What is the definition of power?

a)

How much electricity passes through an appliance

b)

The amount of energy wasted by an appliance

c)

The rate of energy transfer or the rate of doing work

d)

The rate of electron transfer

118.
Which skier has the greatest kinetic energy?
a)
Skier A
b)
Skier B
c)
Skier C
d)
Skier D
119.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

120.

units of force are

a)

newtons

b)

grams

c)

joules

d)

meters

121.
A microwave has a power rating of 1550 W. How much energy does it transfer per second?
a)
1.550 Joules
b)
15.50 Joules
c)
155.0 Joules
d)
1550 Joules
122.

Energy is measured in.....

a)

kilograms

b)

metres per second

c)

Joules

d)

metres

123.

Which energy store is missing? Magnetic, electrostatic, nuclear, gravitational, elastic, thermal, chemical and....

a)

heating

b)

lighting

c)

kinetic

d)

sounding

124.

Energy cannot be created or destroyed, it can only be _________ between the stores

a)

removed

b)

dissipated

c)

transferred

d)

stored

125.

When a kettle boils, energy is transferred from the electrostatic store to the _________________ energy store.

a)

chemical

b)

kinetic

c)

elastic

d)

thermal

126.

On a rollercoaster, the gravitational potential is at its highest/lowest when it reaches the top of the track

a)

highest

b)

lowest

127.

On a rollercoaster, gravitational energy is transferred to which other two energy stores?

a)

thermal and electrostatic

b)

kinetic and chemical

c)

kinetic and nuclear

d)

thermal and kinetic

128.

Work done is another way of saying energy is transferred. What are the units of measurement fir work done?

a)

kilograms

b)

Joules

c)

Degrees celcius

d)

Joules per kilogram degrees celcius

129.

What is the equation to work out kinetic energy?

a)

mass x velocity

b)

0.5 x mass x velocity

c)

0.5 x mass x velocity3

d)

0.5 x mass x velocity2

130.

What is the equation to work out gravitational potential energy?

a)

mass x gravitational field strength x height

b)

0.5 x mass x velocity2

c)

mass x height

d)

height x gravitational field strength

131.

What is the unit of measurement for mass?

a)

grams

b)

kilograms

c)

metres

d)

metres per second

132.

Power = ______________ ÷\div   time

a)

mass

b)

height

c)

energy

d)

work done

133.

What is the unit of measurement for Power?

a)

metres

b)

kilograms

c)

Watts

d)

Joules

134.

Insulation reduces the rate of energy transfer by heating. What methods below do we use in our homes to reduce wasted energy?

a)

double glazed windows

b)

log burners

c)

thick carpets

d)

cavity wall insulation

135.

Lubricating certain machines or bikes reduces which type of force?

a)

air resistance

b)

tension

c)

magnetic

d)

friction

136.

Which of the following is NOT a store of energy?

a)

Kinetic

b)

Gravitational Potential

c)

Elastic potential

d)

Thermal

e)

Sound

137.

Which of the following is NOT a transfer of energy?

a)

Heating

b)

Kinetically

c)

Mechanically

d)

Electrically

e)

Waves

138.

Which is the correct equation that links work done, power and time?

a)

power = work done x time

b)

time = power x work done

c)

work done = power x time

d)

work done = power / time

139.

What is the equation that links extension (e), force applied to a spring (F) and spring constant (k)?

a)

Force applied to a Spring = Spring Constant x Extension, or F=ke

b)

Force applied to a Spring = Spring Constant / Extension, or F=k/e

c)

Force applied to a Spring = Extension / Spring Constant, or F=e/k

140.

What is the equation that links gravitational field strength (g), gravitational potential energy (Eg), height (h), and mass (m)?

a)

Gravitational Potential Energy = Mass x Gravitational Field Strength x Height, or Eg=mgh

b)

Gravitational Potential Energy = Mass / (Gravitational Field Strength x Height), or Eg=m/(gh)

c)

Gravitational Potential Energy = Mass x Gravitational Field Strength / Height, or Eg=mg/h

141.

What is the equation that links energy transferred (E), power (P) and time (t)?

a)

Power = Energy Transferred / Time, or P=E/t

b)

Power = Time / Energy Transferred, or P=t/E

c)

Power = Energy Transferred x Time, or P=Et

142.

What is the equation that links efficiency, total power (or energy) in and useful power (or energy) out?

a)

Efficiency = Useful Power (or Energy) Out / Total Power (or Energy) In

b)

Efficiency = Useful Power (or Energy) Out x Total Power (or Energy) In

c)

Efficiency = Total Power (or Energy) In / Useful Power (or Energy) Out

143.

What is the equation that links Power (P), Time (t) and Work Done (W)?

a)

Power = Time x Work Done, or P=tW

b)

Power = Time / Work Done, or P=t/W

c)

Power = Work Done / Time, or P=W/t

144.

When an object is moved to a higher position, what name is given to the energy it then stores?

a)

Gravitational

b)

Elastic

c)

Height

d)

Kinetic

145.
What type of energy is stored in food and fuel?
a)
Chemical
b)
Thermal
c)
Potential
d)
Calories
146.

Energy stored in objects being stretched or squashed...

a)

Elastic Energy

b)

Kinetic Energy

c)

Chemical Energy

d)

Thermal Energy

147.

A cyclist waiting at the top of a hill has...

a)

Kinetic Energy

b)

Chemical Energy

c)

Elastic Energy

d)

Gravitational Energy

148.

A hot drink has a store of...

a)

Kinetic Energy

b)

Heat Energy

c)

Thermal Energy

d)

Nuclear Energy

149.
What is an energy transfer?
a)
Dancing 
b)
Movement of energy
c)
Movement of energy from one store to another
d)
something moving
150.
What is a kinetic store of energy?
a)
something moving
b)
energy stored in a moving object
c)
elastic potential energy
d)
an stationary object
151.
Energy can not be created or destroyed!
a)
True
b)
False
152.
Efficiency is....
a)
measured in Joules.
b)
a percentage.
c)
measured in Watts.
d)
measured in Newtons.
153.

A car transfers 100 J of chemical energy in order to gain 50 J of kinetic energy. The efficiency of the car is

a)

20%

b)

0.5%

c)

50%

d)

200%

154.

Heat energy is also called ______ energy.

a)

chemical

b)

electrical

c)

mechanical

d)

thermal

155.

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
efficiency = useful enegytotal energy in ×100efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100  

a)

100%

b)

80%

c)

40%

d)

10%

156.

A lightbulb with efficiency of 10% would be

a)

efficient

b)

inefficient

157.

Total energy = 350J
Useful energy = 70J

Workout the efficiency of this iphoneX.
efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

80%

c)

40%

d)

20%

158.

Total energy = 34000J
Useful energy = 340J

Workout the efficiency of this vintage VW Beetle.
efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

10%

c)

40%

d)

20%

159.

Total energy = 150J
Useful energy = 20J

Workout the efficiency of this xbox charger. efficiency = useful energytotal energy in  ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in\ }\ \times100\%  

a)

13.33%

b)

14%

c)

67%

d)

20%

160.

Total energy = 250J
Useful energy = 50J

Workout the efficiency of these fairy lights. efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

13.33%

b)

14%

c)

20%

d)

21%

161.

This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?

a)

13600J

b)

3600J

c)

5000J

d)

8600J

162.

Useful energy: 3600J
Total energy: 4700J

Calculate the efficiency of this fancy Ferrari car. efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

77J

b)

77%

c)

77cm

d)

77s

163.

A blender uses 1000 J of energy to spin it's blades and make smoothies. What is the input energy?

a)

Electrical

b)

Sound

c)

Heat

d)

Mechanical

164.

An oven uses 400 J of electricity to produce 300 J of heat. How efficient is it?

a)

133 %

b)

75 %

c)

300 %

d)

.75 %

165.

A car uses 100 J of gasoline. 83 J are turned into mechanical energy. How much should be turned into heat?

a)

7 J

b)

17 J

c)

83 J

d)

100 J

166.

An oven uses energy to produce heat, light, and sound. If it produces 400 J of heat, 75 J of light, and 50 J of sound, how much input energy did it have?

a)

400 J

b)

500 J

c)

525 J

d)

375 J

167.

Total energy in has to equal

a)

Total energy out (wasteful + useful)

b)

Useful energy out

c)

Useful out - wasteful

168.

A TV uses 200 J of electricity and transforms it into 125 J of sound and light and 75 J of heat. How efficient is it?

a)

62.5%

b)

.625%

c)

37.5%

d)

.375%