Energy stores Flashcards
1
Q
What five ways can energy be stored?
A
- Thermal energy stores
- Kinetic energy stores
- Elastic energy stores
- Chemical energy stores
- Gravitational potential energy stores
2
Q
What four ways can energy be transferred?
A
- Mechanically
- Chemically
- Heat
- Radiation (Light and Sound)
3
Q
Describe the changes involved in an object projected upwards.
A
- Objects projected upwards
- Energy store transfers; chemical to kinetic energy
4
Q
Describe the changes involved when an object falls.
A
- Object falls
- Gravitational potential energy store decreases
- Kinetic energy store increases
5
Q
Describe the energy transfer that happens when an object hits the ground without bouncing back.
A
- Object hits the ground
- Kinetic energy store decreases
- Transfers to surrounding
- Thermal energy store in surrounding increases
- Transferred by sound waves
6
Q
What happens when a system changes?
A
- Energy is transferred
7
Q
What is a closed system?
A
- Where no matter and energy can enter or leave
8
Q
What is the net change (total energy) of a closed system?
A
- Zero
9
Q
Describe the changes involved when a moving object hits an obstacle.
A
- Work is done (work done)
- Kinetic energy of moving object transfers (to elastic potential energy, thermal energy)
- Some energy transferred by sound waves
10
Q
Describe the changes involved when a vehicle is slowing down.
A
- Work is done (work done)
- Kinetic energy transfers to thermal energy of surroundings.
11
Q
Describe the changes involved when water is being boiled in an electric kettle.
A
- Energy transferred electrically to thermal energy of kettle
- Thermal energy of kettle transfers thermal energy to water by heating
- Thermal energy store of water increases
