Energy Changes in a System

• Define Specific Heat Capacity of a substance.

  Specific Heat Capacity is the amount of energy required to heat up 1kg of a substance by 1°C
• Units for SHC (Specific Heat Capacity)


  J/°C/kg
• Power

  Rate at which energy is transferred
• Describe energy changes in a ball which is thrown up into the air and returns to it's starting position.

  Upwards: KE to GPE

  Peak: Maximum GPE, no kinetic energy

  Downwards: GPE to KE
• Examples of chemical energy stores

  Fuel, Food, Batteries