6.1.1.1 - Energy Stores and System

Question 1

What is a system?

Answer 1

A system is an object or group of objects.

Question 2

When there are changes in the way energy is stored?

Answer 2

When a system changes.

Question 3

Give examples of ways energy is stored when a system changes.

Answer 3

An object projected upwards.
A moving object htting an obstacle.
An object accelerated by a constant force.
A vehicle slowing down.
Bringing water to a boil in an eletric kettle.

Question 4

Which changes in energy is involved when a system is changed?

Answer 4

Heating.
Work done by forces.
Work done when a current flows.

Question 5

What does thermal energy means?

Answer 5

It means the energy of an object given its temperature.

Question 6

What does chemical energy means? Give an example.

Answer 6

It means energy stores within chemical bonds, such as ones between molecules.

Question 7

What does kinetic energy means?

Answer 7

It means the energy of a moving object.

Question 8

What does gravitational potential energy means?

Answer 8

It means energy of an object because of its position (height) on the ground.

Question 9

What does elastic potential energy means?

Answer 9

It means energy stored when an object is stretched or squashed.

Question 10

What does electrical energy means?

Answer 10

It means energy stored from an electrical current.

Question 11

What does sound energy means?

Answer 11

It means energy transferred or stores from audio/sound waves.

Question 12

What does internal (thermal) energy means?

Answer 12

It means the total kinetic and potential energy of the particles in an object.

Question 13

What does magnetic energy means?

Answer 13

It means energy store from magnetic poles attracting or being pulled apart.

Question 14

What happens when a system changes?

Answer 14

When a system changes, there is a change in some or all of the energy that is stored.

Question 15

What does “work” in the scientific term is for?

Answer 15

It is for when energy has been transferred.

Question 16

Energy can be transferred by which transfers?

Answer 16

Mechanical work
Electrical work
Heating
Radiation

Question 17

What is mechanical work?

Answer 17

It is a force that moves an object through a distance.

Question 18

What does electrical work do?

Answer 18

It charges that move due to potential difference.

Question 19

Why is energy transferred by heating?

Answer 19

It is due to a temperature difference caused electrically or through a chemical reaction.

Question 20

When energy transferred by radiation? Give an example.

Answer 20

When energy is transferred as a wave, such as infrared rays.

Question 21

What is an Energy Flow Diagram?

Answer 21

It is a diagram used to represent an energy transfer.

Question 22

How an Energy Flow Diagram works?

Answer 22

In an Energy Flow Diagram, the boxes represent the ‘Energy Stores’, and the arrows represents ‘Energy Transfers’. It
can be a transfer diagram, or a ‘snakey’ diagram – which better represents a change in energy stores.

Question 23

Explain the transfer diagram.

Answer 23

In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.

Question 24

Explain the sankey diagram.

Answer 24

Sankey diagrams start off as one arrow that splits into two or more points.