Energy Stores & Transfers

Question 1

What is a system and describe it?

Answer 1

A system is defined as:
An object or group of objects. A system could be large or small, incorporating just one object, or a whole group of objects and their surroundings.
When a system is in equilibrium, nothing changes, and so nothing happens. When there is a change to a system, energy is transferred.

Question 2

What occurs when a system is in equilibrium?

Answer 2

When a system is in equilibrium, nothing changes, and so nothing happens.

Question 3

What happens when there is a change to a system?

Answer 3

When there is a change to a system, energy is transferred.

Question 4

Describe what happens if an apple sits on a table, and that table is suddenly removed.

Answer 4

If an apple sits on a table, and that table is suddenly removed, the apple will fall
As the apple falls, energy is transferred.

Question 5

Describe the following energy store: kinetic

Answer 5

Moving objects have energy in their kinetic store.

Question 6

Describe the following energy store: Gravitational

Answer 6

Objects gain energy in their gravitational potential store when they are lifted above ground.

Question 7

Describe the following energy store: Elastic

Answer 7

Objects have energy in their elastic potential store if they are stretched.

Question 8

Describe the following energy store: Electrostatic

Answer 8

Objects with charge (Like electrons and protons) interacting with one another have energy in their electrostatic store.

Question 9

Describe the following energy store: Magnetic

Answer 9

Magnetic interacting with each other have energy in their magnetic store.

Question 10

Describe the following energy store: Chemical

Answer 10

Objects with energy in their chemical store can release energy in chemical reactions.

Question 11

Describe the following energy store: Nuclear

Answer 11

Atomic nuclei release energy from their nuclear store during nuclear redctions.

Question 12

Describe the following energy store: Thermal

Answer 12

All objects have energy in their thermal store, the hotter the object, the more energy it has in this store.

Question 13

How is energy transferred between stores and give examples?

Answer 13

Energy is transferred between stores by different energy transfer pathways.
The energy transfer pathways are:
Mechanical
Electrical
Heating
Radiation

Question 14

Describe the following energy transfer pathway: Mechanical working

Answer 14

When a force acts on an object e.g. pulling, pushing, stretching, squashing.

Question 15

Describe the following energy transfer pathway: Electrical working

Answer 15

A charge (current) moving through a potential difference e.g. charge flowing around a circuit.

Question 16

Describe the following energy transfer pathway: Heating by particles

Answer 16

Energy is transferred from a hotter object to a colder one.

Question 17

Describe the following energy transfer pathway: Heating by particles

Answer 17

Energy transferred by electromagnetic waves e.g. Light.

Question 18

Describe the energy transfer: hot coffee heating up cold hands

Answer 18

The system is the coffee, the mug and the hand.
Energy is transferred by heating from the thermal store of the coffee to the thermal store of the mug.
Energy is transferred by heating from the thermal store of the mug to the thermal store of the hand.
This type of energy transfer is by heating.