P2Ch2 Energy

Question 1

What is the name of the unit used to measure energy?

Answer 1

Joule

Question 2

Which ‘energy store’ is associated with how hot an object is?

Answer 2

Thermal energy store

Question 3

Which ‘energy store’ is associated with energy stored in chemical bonds (eg in food, fuels, batteries)

Answer 3

Chemical energy store

Question 4

Which ‘energy store’ is associated with the movement of an object?

Answer 4

Kinetic energy store

Question 5

Which ‘energy store’ is associated with how high an object is?

Answer 5

Gravitational potential energy store

Question 6

Which ‘energy store’ is associated with how stretched/ squashed an object is?

Answer 6

Elastic energy store

Question 7

What word do we use to describe energy that has been transferred to the thermal store the environment?

Answer 7

Dissipated.

Question 8

What is conduction?

How is energy transferred by conduction?

Answer 8

Energy transfer through solids.
Particles in a solid vibrate - the more they are heated, the more they vibrate
These vibrations are passed on as particles collide with the ones next to them…

Question 9

What is an insulator?

Answer 9

A solid which is not a very good conductor

Question 10

What is convection?

How is energy transferred by convection?

Answer 10

Convection is how energy is transferred through liquids or gases.
When particles are heated, they spread out more - the liquid/gas becomes less dense.
When particles cool, they move closer together again - the liquid/gas becomes more dense.
This process can lead to a convection current…

Question 11

What is radiation?

Answer 11

All objects give out, or ‘emit’ radiation. The hotter an object, the more radiation it emits.

Question 12

What is a fossil fuel?

Which fuels are classed as fossil fuels?

Answer 12

A fossil fuel is a fuel that was formed over millions of years from dead animals and plants.
Coal, oil and gas are all fossil fuels

Question 13

What is a ‘non-renewable’ resources?

Answer 13

One that cannot be used more than once and will eventually run out. Fossil fuels are non-renewable

Question 14

What is a ‘renewable’ resource?

Give some examples of renewable energy resources

Answer 14

One that can be reused.
Examples of where renewable resources are used to generate electricity include solar panels, wind turbines, wave turbines, hydroelectric dams

Question 15

What is the unit for measuring power?

Answer 15

Watt

Question 16

What is ‘power’?

Answer 16

A measurement of how many joules of energy are transferred each second

Question 17

What do we mean by ‘work’ when we use that word in physics?

Answer 17

‘Work’ is a word used to describe transferring energy.
When you lift a book, you do work against gravity.
When you drag a chair across the floor, you do work against friction.