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Year 8 Energy

Total questions: 51

Worksheet time: 59mins

Name
Class
Date
1.

What is energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

The ability to do work.

2.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

3.

What is kinetic energy?

a)

moving energy

b)

potential energy

c)

stored energy

d)

renewable energy

4.
YOUR BODY OBTAINS ENERGY FROM THE FOOD YOU EAT. WHAT IS THE FORM OF ENERGY IN FOOD?
a)
KINETIC
b)
ELASTIC
c)
GRAVITATIONAL
d)
CHEMICAL
5.
What kind of energy does this device use?
a)
Chemical
b)
Electrical
c)
Thermal
d)
Chemical
6.
What kind of energy is represented in this picture?
a)
Thermal
b)
Potential
c)
Nuclear
d)
Mechanical
7.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
8.
Heat energy is also called
a)
electrical energy
b)
chemical energy
c)
light energy
d)
thermal energy
9.

When energy changes from one form to another, we call it a _______________.

a)

transformation

b)

creation

c)

expiration

d)

compilation

10.
When plants convert the sun's energy into food, which type of energy is it?
a)
kinetic
b)
chemical
c)
thermal
d)
radiant
11.
The glow sticks produce light for a short amount of time. The light from the glow stick is a conversion from what to what?
a)
thermal to light
b)
gravitational to potential
c)
radiant to electrical
d)
chemical to light
12.
Wind turbines and windmills convert what energy to another?
a)
Kinetic to electric
b)
Gravitational potential to electric
c)
Mechanical to potential
d)
Thermal to sound
13.
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
14.
Energy stored in the nucleus of an atom is called
a)
electromagnetic energy
b)
nuclear energy
c)
mechanical energy
d)
chemical energy
15.
At what position would a cyclist have the most kinetic energy?
a)
A
b)
B
c)
D
d)
F
16.
The roller coaster cart has the most gravitational potential energy at position-
a)
W
b)
X
c)
Y
d)
Z
17.
What is the form of wasted energy in the following:
a)
Heat
b)
Kinetic
c)
Sound
18.

What happens when a rollercoaster is moving up its first hill?

a)

Potential increases, kinetic decreases

b)

Potential increases, kinetic increases

c)

Potential decreases, kinetic decreases

d)

Potential decreases, kinetic increases

19.

Energy is measured in

a)

Newtons

b)

Joules

c)

Calories

d)

Watts

20.

Mechanical energy consists of

a)

Potential

b)

Kinetic

c)

Potential and kinetic

d)

Elastic

21.

Which image does NOT show chemical energy?

a)
b)
c)
d)
22.

Which would have more kinetic energy?

a)

A person at 60km/h

b)

A car at 60km/h

c)

A truck at 60km/h

d)

A plane at 60km/h

23.

Which has more kinetic energy?

a)

Mr Harty sitting still

b)

Mr Harty walking down the stairs

c)

Mr Harty chasing after student

d)

Mr Harty on his electric scooter racing down Hawthorne Road away from school

24.
Calculate work: A 100 Newton force is applied to move a 15 kg object a distance of 5 meters?
a)
20 Joules
b)
75 Joules
c)
500 Joules
d)
1500 J
25.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
26.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
27.
What type of energy is transferred between a cold and warm block?
a)
thermal energy
b)
chemical energy
c)
electrical energy
d)
mechanical energy
28.

The arrows in an energy chain diagram symbolise

a)

The energy transformation

b)

The amount of wasted energy

c)

There are no arrows

d)

The next series of events

29.

What is this diagram called?

a)

Stankey Diagram

b)

Sankey Diagram

c)

Stinky Diagram

d)

Samkay Diagram

30.

The energy efficiency shown in this diagram is:

a)

About 10%.

b)

About 30%.

c)

About 60%.

d)

Impossible to tell.

31.

The wasted energy in this diagram:

a)

is the bottom arrow.

b)

is the green arrow.

c)

is made of three types of energy.

d)

is the longest arrow.

32.
what type of energy is stored in a battery?
a)
electrical
b)
chemical
c)
thermal
d)
mechanical
33.
Which energy transformation occurs in a toaster?
a)
chemical to electric
b)
electric to thermal
c)
kinetic to chemical
d)
thermal to potential
34.
Energy can be classified into these two categories.
a)
Potential and kinetic
b)
Gravitational and elastic
c)
Light and sound
d)
Kinetic and movement
35.

Which object shows an energy transformation from electrical to mechanical?

a)
b)
c)
d)
36.

Where is the kinetic energy the greatest?

a)

A

b)

B

c)

C

d)

D

37.
Calculate the KE of a moving 4 kilogram object traveling at a velocity of 3 m/s.
a)
18 J
b)
36 J
c)
12 J
d)
6 J
38.
How much KE does a moving 6 kilogram object have if it moves with a velocity of 3 m/s?
a)
27 J
b)
18 J
c)
9 J
d)
2 J
39.
What is the mass of a moving object that has 100 Joules of KE and moves at a velocity of 2 m/s?
a)
50 kg
b)
200 kg
c)
25 kg
d)
100 kg
40.

As an objects mass increases, its Kinetic Energy ...

a)

increases if velocity stays the same

b)

decreases if velocity stays the same

c)

stays the same if velocity stays the same

d)

transforms if velocity stays the same

41.

As the velocity of an object decreases its Kinetic Energy will...

a)

increase

b)

decrease

c)

stay the same

42.
The Law of Conservation of Energy states that
a)
energy cannot be created nor destroyed, only transformed or transferred
b)
energy can be destroyed but not created
c)
energy can be created but not destroyed
43.
A moving 10 kilogram object has 20 Joules of KE. What is its velocity?
a)
2 m/s
b)
4 m/s
c)
200 m/s
d)
10 m/s
44.

At which point does the ball has the greatest gravitational potential energy (GPE)?

a)

A

b)

G

c)

D

d)

C

e)

G

45.

What is the gravitational potential energy (GPE) of a 1 kilogram book that is 1 meter above the ground?

g = 9.8 m/s2

a)

9.8 Joules

b)

1.0 Joule

c)

0.10 Joule

d)

11.8 m/s2

46.

When you compress a spring, you are storing __________ energy.

a)

sound

b)

elastic

c)

light

d)

chemical

47.

A golf pro swings his driver with a mass of 0.75 kg at a velocity of 60 m/s. What is the kinetic energy of the club?

a)

22.5 J

b)

It doesn't have kinetic energy-it has potential energy.

c)

2,700 J

d)

1,350 J

48.

Which of the following has the greatest amount of gravitational potential energy (gravity = 9.8 m/s2)?

a)

A 20 kg projector suspended 10 m in the air

b)

A 100 kg wrecking ball suspended 10 m in the air

c)

A 5 kg basketball suspended 10 m in the air

d)

They all have the same GPE because they are all 10 m in the air

49.

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%

50.

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

51.

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%

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