1.7 Energy Transfer By Design

Question 1

Name 4 things that the rate at which energy is transferred by heating depends on

Answer 1

• temperature difference between an object and its surroundings
• the materials the object is in contact with
• the objects shape
• the objects surface area

Question 2

Name 3 ways we can maximise the rate of energy transfer to keep things cool

Answer 2

• use good conductors
• paint it dull black
• have the air flow around it maximised

Question 3

Why does painting an object black maximise the rate of energy transfer?

Answer 3

Black emits the most infrared radiation

Question 4

Name 3 ways we can minimise the rate of energy transfer to keep things warm

Answer 4

• use good insulators
• paint them shiny white
• prevent convection currents by trapping air in small pockets

Question 5

What do we need to minimise in order to keep things warm?

Answer 5

The rate of energy transfer by conduction, convection and radiation

Question 6

Why does trapping air in small pockets minimise the rate of energy transfer?

Answer 6

It prevents convection currents

Question 7

Name an animal adaptation to minimise the rate of energy transfer

Answer 7

Layers of fur and fat to prevent energy transfer

Question 8

Name an adaptation of an animal to maximise the rate of energy transfer

Answer 8

Big ears to act like radiators and remove the animals heat

Question 9

What is the relationship between the temperature difference between and object and its surroundings and the rate at which energy is transferred?

Answer 9

The greater the temperature difference between an object and its surroundings, the greater the rate as which energy is transferred