Energy

Question 1

What is work done

Answer 1

The energy transferred when a force is used to move an object a certain distance

Question 2

What is work measured in

Answer 2

Joules (J)

Question 3

How do you calculate work

Answer 3

Work done (J) = force (N) x distance moved (m)

Question 4

What is a force multiplier

Answer 4

uses a smaller input force (what you apply) to to generate a larger output force (what is created)

Question 5

What happens when you increase the distance from the pivot

Answer 5

The less input force is needed to be used for the same output force as before

Question 6

What is radiation

Answer 6

A method of transferring energy without the need for particles

Question 7

Name an example of radiation

Answer 7

Thermal energy being transferred from the sun to us through space

Question 8

What is infrared radiation

Answer 8

a type of radiant energy that’s invisible to human eyes but that we can feel as heat

Question 9

do darker matte surfaces absorb infrared radiation and why

Answer 9

Darker surfaces absorb more infrared radiation because lighter colours reflect light instead of absorbing it

Question 10

do shiny and smooth surfaces absorb more infrared radiation

Answer 10

Shiny surfaces absorb and emit less infrared radiation and instead reflect it

Question 11

What is a thermal imaging camera

Answer 11

The amount of infrared radiation being emitted can be viewed on a thermal infrared imaging camera

Question 12

What gives off more radiation hotter or colder objects

Answer 12

Hotter

Question 13

what happens to particles when they are heated

Answer 13

They move quicker

Question 14

What has more thermal energy a bath of water at 30 degrees or a cup of tea at 90 degrees

Answer 14

A bath of water as there are many more particles

Question 15

Define conduction

Answer 15

The transfer of thermal energy by the vibration of particles happens mostly in solids because the particles are close together

Question 16

What does high thermal energy store mean

Answer 16

High temperature

Question 17

Why are gasses and liquids poor conductors

Answer 17

Because their particles are spread out and do not collide often

Question 18

What is convection

Answer 18

The transfer of thermal energy in a liquid or gas

Question 19

What is a convection current

Answer 19

When the particles near the heat source are heated the spread out and rise as they are less dense the more dense particles will take their place by the heat source creating a flow of particles

Question 20

Name some energy stores

Answer 20

Kinetic (movement ) anything that moves has a kinetic energy store
Magnetic energy store two magnets that attract or repel have energy in there magnetic energy stores
Elastic energy store anything stretched had energy in its elastic energy store like rubber bands

Question 21

How can u transfer energy between stores

Answer 21

Mechanically
Electrically
By heating

Question 22

Name an example of energy being transferred between stores

Answer 22

When you burn fuel, energy is transferred from the fuel’s chemical energy store to the thermal energy store of the surroundings

Question 23

What is energy measured in

Answer 23

Joules (J)

Question 24

When is energy transferred

Answer 24

When a force moves an object

Question 25

How do you calculate energy transferred

Answer 25

Energy transferred (J) = force (in newtons N) x distance (in meters M)

Question 26

How does heat travel

Answer 26

From hot to cold

Question 27

What is thermal equilibrium

Answer 27

A point at which both objects are the same temperature

Question 28

Do the objects need to be touching for energy transfer in solids

Answer 28

Yes

Question 29

What are materials that transfer energy by heating quickly called (like metals)

Answer 29

Conductors

Question 30

What are metals that transfer energy more slowly called (like plastics)

Answer 30

Insulators