Energy Stores And Systems

Question 1

What is a system?

Answer 1

A system is an object or a group of objects

Question 2

What happens when a system changes?

Answer 2

There are changes in a way energy can be stored when a system changes

Question 3

In what ways can energy be stored? There are 8 stores

Answer 3

1. Chemical (due to chemical bonds) e.g. food, fuel, batteries
2. Kinetic (due to movement)
3. Gravitational (due to height)
4. Elastic (due to stretching or compressing)
5. Thermal (because of a body’s temperature)
6. Magnetic (due to magnetic forces)
7. Electrostatic (due to electrostatic forces)
8. Nuclear (due to forces in the nucleus of an atom)

Question 4

How can energy be transferred from one store to another?

Answer 4

By Energy carriers and pathways

1. Mechanical - work done by force
2. Electrical - work done by a current
3. Heating - because of temperature difference
4. Radiation e.g. light, infra red

Question 5

A ball projected upwards - what energy transfer?

Answer 5

Kinetic - work done by gravity - gravitational

Question 6

A car crashing into a wall - what energy transfer?

Answer 6

Kinetic - work done by force of wall - thermal

Question 7

A car accelerating up a hill - what energy transfer?

Answer 7

Chemical - work done by force of engine - kinetic + gravitational

Question 8

A car slowing down by braking - what energy transfer?

Answer 8

Kinetic - work done by frictional force at brakes - thermal

Question 9

Bringing water to a boil in a electric kettle - what energy transfer?

Answer 9

Chemical (fuel) - work done by electrical current - thermal