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P1 - Energy Equations

Total questions: 80

Worksheet time: 1hrs 20mins

Name
Class
Date
1.

Work Done =

a)

Force / distance

b)

Force x distance

c)

Force x distance2

d)

Force2 x distance

2.

The unit of Work done is...

a)

Newton (N)

b)

Meter (m)

c)

Joule (J)

d)

Second (s)

3.

Which is the unit of Force?

a)

Joule (J)

b)

Meter (m)

c)

Watt (W)

d)

Newton (N)

4.

The unit of distance is...

a)

Second (s)

b)

Meter (m)

c)

Joule (J)

d)

Watt (W)

5.

Which is the unit of Weight?

a)

Joule (J)

b)

Watt (W)

c)

Newton (N)

d)

Meter (m)

6.

The unit of mass is...

a)

Meter (m)

b)

Joule (J)

c)

Newton (N)

d)

Kilogram (kg)

7.

The unit of gravitational field strength ....

a)

Newtons per kilogram (N / kg)

b)

Newton (N)

c)

Joule (J)

d)

Joules per second (J / s)

8.

Gravitational Potential Energy =

a)

mass x height

b)

gravitational field strength x height

c)

mass x gravitational field strength x height

d)

weight x mass

9.

Which is the unit of energy?

a)

Joule (J)

b)

Newton (N)

c)

Kilogram (kg)

d)

Watt (W)

10.

Kinetic Energy =

a)

0.5 x mass x speed2

b)

speed x velocty2 x mass

c)

speed x mass / time

d)

0.5 x mass / speed

11.

The unit of speed is...

a)

Meter (m)

b)

Watt (W)

c)

Meters per second2 (m / s2)

d)

Meters per second (m / s)

12.

Efficiency =

a)

Useful Energy / Total Energy (x 100%)

b)

Useful Energy / Wasted Energy (x 100%)

c)

Wasted Energy / Total Energy (x 100%)

d)

Total Energy / Useful Energy (x 100%)

13.

Power =

a)

Energy x time

b)

Energy / time

c)

time / energy

d)

energy2 / time

14.

Which of these is the unit of power?

a)

Joule (J)

b)

Kilogram (kg)

c)

Newtons per meter (N / m)

d)

Watt (W)

15.

The unit of time is...

a)

Meter (m)

b)

Second (s)

c)

Kilogram (kg)

d)

Joule (J)

16.

A block is pushed with a force of 6N for 20m. Calculate the work done.

a)

3.33J

b)

0.3J

c)

20J

d)

120J

17.

A forklift truck does 850J of work pushing a block 50m. What force was is providing?

a)

0.059N

b)

17N

c)

20N

d)

42,500N

18.

Find the work done by a person pushing a bike 1km with a force of 15N

a)

15J

b)

15000J

c)

1000J

d)

10J

19.

A man uses 200J of energy pulling a brick with a force of 12N. How far has he pulled it?

a)

0.06m

b)

16.67m

c)

2400m

d)

2000m

20.

On Earth, a person has a mass of 70 kg and a weight of 700 N. What is the Earth's gravitational field strength?

a)

10 N / kg

b)

49,000 N / kg

c)

0.1 N / kg

d)

100 N / kg

21.

A crane lifts a 65 kg brick, 35 m into the air. What is the gravitational potential energy of the block at the top?

Gravitational field strength = 10 N / kg

a)

22,750 J

b)

227.5 J

c)

18.57 J

d)

0.19 J

22.

A ball of mass 0.8 kg has a gravitational potential energy of 13 J. How high off the ground is the ball?

Gravitational field strength = 10 N / kg

a)

1.0 m

b)

0.62 m

c)

104 m

d)

1.63 m

23.

Find the kinetic energy of a 1500kg car, travelling at 55 m/s.

a)

2,268,750 J

b)

4,537,500 J

c)

82,500 J

d)

41,250

24.

What is the kinetic energy of a 7 kg bowling ball, thrown at 10 m/s

a)

700 J

b)

35 J

c)

350 J

d)

70 J

25.

Find the mass of a ball bowled at 38 m / s which has a kinetic energy of 115 J

a)

0.16 kg

b)

2185 kg

c)

6.1 kg

d)

0.08 kg

26.

A cyclist and bike of total mass 85 kg, have a kinetic energy of 38,250 J. Find their speed.

a)

10 m / s

b)

21 m / s

c)

900 m / s

d)

30 m / s

27.

A TV uses 2000J of electrical energy. The total light and sound energy is 1400J. What is the TVs efficiency?

a)

70%

b)

7%

c)

700%

d)

50%

28.

A light uses 70J of electrical energy and gives out 20J of light energy. What is its efficiency?

a)

0.29

b)

0.52

c)

1.51

d)

3.5

29.

A lamp has an efficiency of 0.8. If the total electrical energy in was 140J, how much light energy comes out?

a)

100 J

b)

175 J

c)

112 J

d)

89.6 J

30.

A motor uses a total energy of 300 J in 20 s. What is its power?

a)

6000 W

b)

15 W

c)

0.067 W

d)

1000 W

31.

A light gives of 400 J of energy in 3 minutes. What is the power of the bulb?

a)

133.3 W

b)

2.2 W

c)

1200 W

d)

7.2 W

32.

A 20 W torch is used for 15 seconds. What energy is transferred?

a)

300 J

b)

1.3 J

c)

250 J

d)

0.75 J

33.

A small 30 W battery is used for 5 minutes. What energy does it transfer?

a)

9,000 J

b)

150 J

c)

15,000 J

d)

1,800 J

34.

An object will have this stored any moment

a)

Friction

b)

Sound

c)

Kinetic

d)

Energy

35.

Which of these are types of energy?

a)

Gravitational

b)

Thermal

c)

Kinetic

d)

All of the above

36.

Where is Gravitational Potential Energy the greatest in a bungee jump?

a)

At the middle point

b)

At the lowest point

c)

At the highest point

d)

None of the above

37.

Energy can't...

a)

Be created

b)

Change form

c)

Be stored

38.

What is the wasted energy output from a TV?

a)

Sound and Light

b)

Thermal

c)

Chemical and Nuclear

d)

Gravitational and Thermal

39.

Which energy store decreases as an object falls?

a)

Kinetic

b)

Heat

c)

Gravitational

d)

Magnetic

40.

Which energy store increases as an object falls?

a)

Kinetic

b)

Gravitational

c)

Magnetic

d)

Nuclear

41.

What energy does food store?

a)

Kinetic

b)

Thermal

c)

Chemical

d)

Gravitational

42.

When a bungee rope is at maximum extension, which energy store is the greatest?

a)

Gravitational

b)

Thermal

c)

Elastic

d)

Kinetic

43.

Conservation of energy applies to..

a)

Most energy changes

b)

All energy changes

c)

No energy changes

44.

When a rubber band is stretched..

a)

It's elastic potential energy store increases

b)

It's elastic potential energy store stays the same

c)

It's elastic potential energy store increases

d)

It's gravitational potential energy store increases

45.

Which energy store is the greatest at the top of a rollercoaster ride?

a)

Kinetic energy

b)

Thermal energy

c)

Gravitational potential energy

d)

Elastic potential energy

46.

A large drill is used to make a hole through rocks in the Earth’s surface to extract oil.

Suggest why the drill is water-cooled as it moves through the rocks.

a)

To keep the drill wet because the rock will dry it

b)

To keep the drill cool because friction will heat it

c)

To keep the drill clean because rocks make it dirty

47.

A gas boiler transfers energy from a ............. store

to a .......... store.

a)

Chemical store to a thermal store

b)

Chemical to kinetic

c)

Kinetic to chemical

d)

Thermal store to kinetic store

e)

Gravitational potential store to kinetic store

48.

As water falls from the shower, energy is transferred from a

.............. store to a .................. store.

a)

Chemical store to a thermal store

b)

Chemical to kinetic

c)

Kinetic to chemical

d)

Thermal store to kinetic store

e)

Gravitational potential store to kinetic store

49.

A ceiling fan transfers energy from a ................ store

of the power station to a ..................store of the moving air.

a)

Chemical store to a thermal store

b)

Chemical to kinetic

c)

Kinetic to chemical

d)

Thermal store to kinetic store

e)

Gravitational potential store to kinetic store

50.

Write down the equation that links gravitational potential energy, mass, gravitational field strength, and height.

a)

GPE = (m x h) / g

b)

GPE = m x g x h

c)

GPE = 1/ (m x g x h)

d)

GPE = m / (g x h)

51.

What is the equation that links speed, energy, and mass?

a)


KE = mv2KE\ =\ mv^2

b)

KE = 12 mvKE\ =\ \frac{1}{2\ }mv

c)

KE=12 mv2KE=\frac{1}{2\ }mv^2

d)

KE=12m2v2KE=\frac{1}{2}m^2v^2

52.

A 4kg mass has kinetic energy of 32J what is the velocity of the mass?

a)

16m/s

b)

4m/s

c)

2m/s

d)

1m/s

53.

If we trace back all energy we use each day, we find it comes from

a)

kinetic energy

b)

potential energy

c)

the sun

54.

A bus engine transfers chemical potential energy into ____ so that the bus moves.

a)

thermal energy

b)

gravitational potential energy

c)

electrical energy

d)

kinetic energy

55.

The Law of Conservation of Energy states...

a)

energy cannot be created or destroyed, but it can change forms

b)

energy can be created, destroyed, and can change forms

c)

energy cannot be created, destroyed, or change forms

d)

energy cannot be created, but it can be destroyed and change forms

56.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

57.

What is kinetic energy?

a)

moving energy

b)

potential energy

c)

stored energy

d)

renewable energy

58.
Energy of motion is which type of energy?
a)
Potential
b)
Kinetic
c)
Sound
d)
Gravitational
59.
The ability to do work is
a)
power
b)
energy
c)
thermal
d)
kinetic
60.
Stored energy is called ______ energy.
a)
Kinetic
b)
Potential
c)
Pacific
d)
Safe
61.

A computer uses what type of energy to operate?

a)

Mechanical

b)

Light

c)

Electric

d)

Sound

62.

What is an example of sound energy?

a)

headphones

b)

traffic light

c)

sun

d)

bicycle

63.

In the unit we used the equation

W = F x d

The quantity W refers to

a)

Work in joules

b)

Work in newtons

c)

Work in Watts

d)

Watts in Kilowatt hours

64.

In the unit we used the equation

W = F x d

The quantity with units of newtons is

a)

W

b)

F

c)

d

d)

none of them

65.

In the unit we used the equation

W = F x d

The quantity with units of watts is

a)

W

b)

F

c)

d

d)

none of them

66.

In the unit we used the equation

W = F x d

The quantity with units of metres is

a)

W

b)

F

c)

d

d)

none of them

67.

In the unit we used the equation

W = F x d

The quantity with units of joules is

a)

W

b)

F

c)

d

d)

none of them

68.

In the unit we used the equation

GPE = m x g x d

The quantity with units of joules is

a)

GPE

b)

F

c)

d

d)

g

69.

In the unit we used the equation

GPE = m x g x d

The quantity with a value that does not change while we are on the Earth's surface is

a)

GPE

b)

F

c)

d

d)

g

70.

Weight (N) = mass (kg) x Gravitational pull (10m/s2)

What is the WEIGHT of a 2kg bike, assuming a pull of 10m/s2.

a)

20kg

b)

20N

c)

150N

d)

11.5N

71.

Energy _________ = Work Done

a)

Changed

b)

Stored

c)

Transferred

72.

Fill in the gaps:

Energy can't be _________ or _____________, only ____________

a)

Transferred, Destroyed, Created

b)

Joules, Newtons, Potatoes

c)

Created, Destroyed, Transferred

d)

Created, Transferred, Destroyed

73.

GPE (J) = Weight (N) x change in height (m):

A weight of 500N is placed up 1.5m higher than the floor. What is the GPE (J)?

a)

500J

b)

750N

c)

750J

d)

600J

74.

a 2kg object is raised 2m, what is the change in GPE? Hint: m x g x h. (g = 10)

a)

40J

b)

40N

c)

40kg

d)

40m

75.

mass = 450kg, gravity = 10N/kg, height = 12m. Calculate GPE. (mgh)

a)

472J

b)

54,000N

c)

54,000J

d)

5,400J

76.

Ways of reducing friction?

a)

Lubrication

b)

Streamlined

c)

Moving slowly

d)

All of the above

77.

A 11kg baby crawls across the yard at 2 m/s. What is his kinetic energy?

a)

KE = 11 x 1/2 + 22

b)

KE = 0.5 x 11 x 22

c)

KE = 0.5 x 2 x 112

d)

KE = 1/2 + 0.5 + 112

78.

If a 90 kg man and his bicycle are traveling down a path at 25 km/h, what is his total kinetic energy?

a)

KE = 90 + 0.5 + 25²

b)

KE = 0.5 + 90² x 25

c)

KE = 0.5 x 90 x 25²

d)

KE = 0.5 x 25 x 90²

79.

Which of the following is NOT an example of a source of thermal energy?

a)

Fire

b)

Toaster

c)

Oven

d)

Tomato

80.

____________ energy is energy that is stored in the bonds of compounds like food and fuel.

a)

Radiant

b)

Electrical

c)

Thermal

d)

Chemical

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