1.1.1 Energy Stores & Systems

• A system is an object or group of objects.
• There are changes in the way energy is stored when a system changes.
• List the 8 different energy stores:

  Thermal, gravitational potential, elastic potential, magnetic, chemical, electrostatic, nuclear and kinetic.
• Can energy be created, destroyed, both or neither?

  Neither.
• List the 5 different ways energy can be transferred:

  Mechanically, electrically, through heating, via infrared radiation and via light or sound waves.
• Can an open system gain or lose energy to the ‘outside world’?


  Yes.
• Is the energy stored in a battery stored in its kinetic or chemical energy store?

  Chemical energy store.
• Can a closed system gain energy from the 'outside world'?


  No.
• When you burn fuel, energy is transferred from the fuel's chemical energy store to the thermal energy store of the surroundings.
• When you throw a ball up in the air, it moves through a gravitational field. The reason it slows down as it rises is because energy from its kinetic energy store is being transferred to its:

  Gravitational potential energy store.
• Energy is transferred to a light bulb electrically.

  How is energy transferred away from a light bulb?

  By heating and via light.
• As an object falls, energy is transferred from its gravitational potential energy store to its kinetic energy store.