Y7 Energy Revision

• Physics
• Lower Secondary (Key Stage 3)

Y7 Revision: Energy

What do humans use their energy for?

Where do humans get their energy from?

What do you already know about energy?

What is the unit of energy?

1. Joules
2. Watts
3. Seconds
4. Newtons

How many joules in 1 kilojoule?

1. 0.1
2. 1000
3. 100
4. 10

How many kJ are there in 4000J?

1. 400000
2. 0.4
3. 40
4. 4

If a person eats 12000 J of food and uses 8500 J what will happen to that person?

Name an energy store.

Expectations for Chromebooks:

• Bring them to every lesson with a charger.
• Have a go at every question. 
• No playing games.

Energy cannot be created or destroyed, but it can be stored and transferred between stores.

Name 3 things in this room that have a thermal energy store.

Energy cannot be created or destroyed, but it can be stored and transferred between stores.

Name 3 things in this room that have a kinetic energy store.

Energy cannot be created or destroyed, but it can be stored and transferred between stores.

Name 3 things in this room that have a chemical energy store.

Energy cannot be created or destroyed, but it can be stored and transferred between stores.

Name 3 things in this room that have a gravitational potential energy store.

Energy cannot be created or destroyed, but it can be stored and transferred between stores.

Name 3 things in this room that have an elastic potential energy store.

A bonfire has a large ............... energy store.

1. Kinetic
2. Thermal
3. Chemical
4. Elastic potential

A racing formula one car has a large ............... energy store.

1. Kinetic
2. Thermal
3. Chemical
4. Gravitational potential

A flying bird has a large ............... energy store.

1. Kinetic
2. Thermal
3. Chemical
4. Gravitational potential

A stress ball has a large ............... energy store.

1. Elastic potential
2. Thermal
3. Chemical
4. Gravitational potential

A bag of sweets has a large ............... energy store.

1. Elastic potential
2. Thermal
3. Chemical
4. Gravitational potential

Complete the table.

Chemical energy store

Elastic potential energy store

Gravitational potential energy store

Kinetic energy store

Objects moving fast

Hot objects

Stretched or compressed objects

Wood and coal

A rock on a cliff

Boiling water

Energy can be transferred between stores.

Energy can be transferred between stores.

Label the energy store that is being transferred from and to.

Thermal

Kinetic

Chemical

Gravitational potential

Elastic potential

Label the energy store that is being transferred from and to.

Thermal

Kinetic

Chemical

Gravitational potential

Elastic potential

Label the energy store that is being transferred from and to.

Thermal

Kinetic

Chemical

Gravitational potential

Elastic potential

Energy is transferred from the chemical store of the wood to the thermal store of the air by ........................... (you can pick more than one).

Sound

Light

Electricity

Force

Heating

Energy is transferred from the gravitational potential store of the platform diver to the kinetic store of the falling diver by ........................... 

Sound

Light

Electricity

Force

Heating

Complete the sentence.

Thermal

Chemical

Kinetic

Elastic

Gravitational

Heating

Sound

Light

Electricity

Force

Complete the sentence.

Thermal

Chemical

Kinetic

Elastic

Gravitational

Heating

Sound

Light

Electricity

Force

Complete the sentence.

Thermal

Chemical

Kinetic

Elastic

Gravitational

Heating

Sound

Light

Electricity

Force

Complete the sentence.

Thermal

Chemical

Kinetic

Elastic

Gravitational

Heating

Sound

Light

Electricity

Force

Challenge: Describe the energy stores in a hairdryer. How is energy transferred to and from the hairdryer?

Thermal is a....

1. Store
2. Transfer

Heating is a....

1. Store
2. Transfer

Electricity is a....

1. Store
2. Transfer

Kinetic is a....

1. Store
2. Transfer

Sort the keywords into stores or transfers.

Store

Transfer

Force

Thermal

Kinetic

Light

Sound

Gravitational

Heating

Elastic

Chemical

Electricity

How many examples of stores and transfers can you find?

Conservation of energy demo?

Conservation of Energy: What energy stores does a swinging pendulum have?

As the pendulum swings towards the ground, what happens to the amount of gravitational potential energy (GPE)?

1. It increases
2. It decreases

As the pendulum swings towards the ground, what happens to the amount of kinetic energy?

1. It increases
2. It decreases

How is the energy transferred from the gravitational store to the kinetic store?

1. Heating
2. Wave
3. Force
4. Electricity

A pendulum has 20 J of energy. 16 J is in the gravitational potential store, how much is in the kinetic store?

In reality, a pendulum will not keep swinging forever. Why?

Where does the energy we use in our homes come from?

Name some energy resources.

What is the difference between renewable and non-renewable?

Why might we choose to use fossil fuels as an energy resource?

Why might we NOT choose to use fossil fuels as an energy resource?

Why might we choose to use renewable energy resources?

Why might we choose NOT to use renewable energy resources?

Non-renewable 

Renewable

Solar

Wind

Nuclear

Geothermal

Oil

Tidal

Gas

Coal

Hydroelectric

Biomass

Wave

Match the resource to the energy store it uses.

Geothermal

Hydroelectric

Fossil fuels

Wind

Solar

Biomass

Tidal/Wave

Which of these is NOT a fossil fuel resource?

1. Oil
2. Gas
3. Solar
4. Coal

Which of these is NOT a renewable energy resource?

1. Tidal
2. Geothermal
3. Nuclear
4. Hydroelectric

Give an advantage of renewable energy resources.

Give an advantage of non-renewable resources.

Name 2 non-renewable energy resources.

Plant Operator

Average Salary: £32,000

Starting salary for a junior operator is £20,280. The current maximum salary in the UK is £50,000.

Qualifications Required:

4 or 5 GCSEs at grades 9 to 4 (preferably in maths/science/technology). 

+ A levels for higher level apprenticeship schemes.

Suggest the effect of not putting enough coal in the furnace.

Label the coal power station to show how it works.

Fossil fuel

Heat

Boiler

Spinning turbine

Spinning generator

Electric current

Carbon dioxide and other gases

What is power?

What is the unit of power?

1. Joules
2. Watts
3. Kilojoules
4. Newtons

How many watts in a kilowatt?

1. 10
2. 0.1
3. 100
4. 1000

How many watts in a 4 kilowatts?

1. 40
2. 0.4
3. 400
4. 4000

How many watts in a 0.5 kilowatts?

1. 50
2. 0.5
3. 500
4. 5000

A kettle transfers 100 J in 5 seconds. Calculate the power of the kettle.

1. 20 W
2. 500 W
3. 0.05 W
4. 50 W