Energy Stores

Question 1

When is kinetic energy found?

Answer 1

Anything moving has energy in its kinetic energy store.

Question 2

Describe the relationship between kinetic energy and movement

Answer 2

As an object gets faster, its kinetic energy store increases

Question 3

Where is thermal energy found?

Answer 3

All objects have energy in their thermal energy store

Question 4

What causes the thermal energy store to increase?

Answer 4

As an object gets hotter its thermal energy store increases

Question 5

What is chemical energy?

Answer 5

An energy store that can be released by a chemical reaction

Question 6

What objects have energy in their chemical energy store?

Answer 6

Food, fuel, batteries, and muscles all have energy in their chemical energy store

Question 7

What is gravitational potential energy?

Answer 7

The energy store of anything with mass in a gravitational field

Question 8

What causes the gravitational potential energy (GPE) store to increase?

Answer 8

As an object gets higher, its GPE store increases

Question 9

Where is elastic potential energy found?

Answer 9

Anything that is stretched or compressed has energy in its elastic potential energy store.

Question 10

What causes the elastic potential energy (EPE) in an object to increase?

Answer 10

As an object gets stretched further, its EPE store increases

Question 11

What objects contain electrostatic energy?

Answer 11

Charged objects interacting have energy in their electrostatic energy store

Question 12

What objects contain magnetic energy?

Answer 12

Magnetic objects interacting have energy in their magnetic energy store

Question 13

What is nuclear energy?

Answer 13

An energy store that can be released by a nuclear reaction

Question 14

Name the energy stores (8)

Answer 14

1. Kinetic energy (KE)
2. Thermal energy (also known as internal energy)
3. Chemical potential energy (CPE)
4. Gravitational potential energy (GPE)
5. Elastic potential energy (EPE)
6. Electrostatic energy
7. Nuclear energy
8. Magnetic energy

Question 15

State the different ways energy stores change (4)

Answer 15

1. Work is done on the system by a force.
2. Work is done when an electrical current flows.
3. Via heating
4. Via the emission or absorption of radiation.

Question 16

Describe the changes in the energy stored in a spring of a car suspension system when it goes over a bump, compresses, and then goes back to its original length. (5)

Answer 16

1. As the spring compresses, the elastic potential energy increases and …
2. … it is at a maximum when fully compressed.
3. Due to the compression, there is a heating effect…
4. … which causes the internal energy of the spring to increase.
5. As the spring goes back to its original length, the elastic potential energy decreases.

Question 17

Describe how the energy stores change in and around a mobile phone as it is being used (3)

Answer 17

1. Chemical store of battery decreases
2. Thermal energy store of the mobile phone increases
3. Thermal energy store of the surroundings increases