Quick Quiz - What do you remember from last lesson?

• Which types of materials are best at reflecting radiation?• What do we call an object which

gives out a lot of radiation? • What do metals have that make

them so good at conducting? • Hot particles rise because they are

less dense. Why do hot particles become less dense? • How does heat radiation travel?• Can heat radiation travel through

a vacuum?

Heat Transfer

L/O :- To use your knowledge of conduction, convection and radiation, to explain the design of different objects

Can you use what you know??

What is the difference between these 2 elephants?

Can you explain this using conduction, convection or radiation?

African

Indian

End

TASKThere are a number of objects around the

room. You are going to be asked to explain how each object uses CONDUCTION,

CONVECTION and RADIATION

You will need to fill out a sheet in pairs. You should take it in turns to

fill out the sections. You will then be asked to feed your ideas back to

other groups

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2 Minute Timer

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Survival Blanket Is it designed to keep heat in or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Thermos Flask Is it designed to keep heat in or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Ray boxIs it designed to keep heat in or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Heat SinksIs it designed to keep heat in or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Polystyrene Cups Is it designed to keep heat in or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Radiometer Is it designed to attract heat or let heat out?

Does it use conduction? How? 

Does it use convection? How? 

Does it use radiation? How?

Heat Transfer Questions

1. How does a non metal object slow down heat loss by conduction?

2. How does a material which traps tiny air pockets stop heat loss by

1. Conduction2. Convection

3. How does a vacuum stop heat loss by1. Conduction2. Convection

4. How does a silvered surface stop heat loss by radiation?

How is this flask designed to prevent heat loss?

The cork prevents heat being loss by

convection Particles cannot leave out of the

top and take heat with them

Cork used as support and bung

to prevent conduction. Cork has trapped air and so does not conduct

well

Vacuum to prevent conduction. There are no particles in a vacuum so no conduction can

happen

Silvered surfaces to slow radiation.

The silver surfaces reflect heat back into the flask

Would this keep a cold drink cold?

Why is it important for us

to be able to save objects from losing

energy?

Energy costs a lot of money!

Creating energy can release carbon dioxide which contributes to

global warming

Burning fossil fuels such as

coal can release sulphur dioxide which causes

acid rain

Sometimes companies recycle their lost energy e.g. power

stations can recycle some of the heat they produce to heat local homes. This is better for the environment and earns them

extra money!

TASKYour task is to design the ‘snuggly-buggly’ ski-suit

Use what you know about conduction, convection and radiation to design a suit to

keep this baby as warm as possible. You will need to label your design to show what you features and materials you have chosen

and why

What have you learnt?

• Can you explain how a thermos flask keeps your tea warm?• Can you explain how an object would be designed to keep it as cool as possible e.g. a heat sink?• Do you know what it is important to save energy/heat?