Energy Flashcards
(7 cards)
List seven energy stores
Energy stores
- Gravitational potential energy store - height
- Chemical energy store - food, fuel & battery
- Kinetic energy store - movement
- Elastic energy store - strteched rubber bands and springs
- Magnetic energy store - two magnets attract or repel each other
- Electrostatic energy store - two electric charges attract or repel each other
- Thermal energy store - hot & high temperature
List four types of energy transfer
Types of energy transfer
- Mechanically - force - move object pushed, pulled, stretched or dquashed
- By heating - hotter objects to colder objects
- Electrically - electric charges move in a electric circuit
- By light and sound waves
Energy transfer examples
- Drop an object
- Burn fuel
- Battery
- Stretched objects
- Food
Energy transfer examples
1.Drop an object
Gravitational energy store to kinetic energy store
- Burn fuel
Chemical energy store to thermal energy store
- Battery
Chemical energy store to kinetic energy store
- Stretched objects
Elastic energy store to kinetic energy store
- Food
Chemical energy store to kinetic energy store and thermal energy store
When a forec moves an object through a distance, energy is transferred
Energy transferred = ?
Energy transferred = Force X Distance
(in jules J) (in newtons N) (metres M)
E.g. Force = 340N
Distance = 5M
Energy transferred = 340 X 5 = 1700 J
What is thermal equilibrium?
When there’s a temperature difference between two objects, energy will be transferred from the hotter one to the cooler one (so the hotter object will cool down and the cooler object will heat up) until the objects reach thermal equilibrium — the point at which they’re both the same temperature.
How can energy be transferred between objects (cold - hot)?
Energy can be transferred between objects by heating.
Name the two ways energy can be transferred by heating?
