Energy

• name the different energy stores

  kinetic, elastic, gravitational, thermal, chemical, nuclear, magnetic, electrostatic
• Displacement

  Change in position (vector)
• Velocity

  Rate of change of displacement (vector)
• Acceleration

  Rate of change of velocity (vector)
• Newton's Third Law

  Every action has an equal and opposite reaction
• Newton's Second Law

  Force is equal to mass times acceleration (F=ma)
• Refraction

  Bending of a wave as it passes from one medium to another
• Reflection

  Change in direction of a wave at a surface
• different transfer of energy stores

  electricity, heating, mechanically, radiation
• Reducing energy waste

  Lubrication

  o Oil in a motor

  o Reduces friction

  o So less energy is lost (as heat) through friction
• Non-renewable energy

  Fossil Fuels (coal, oil, gas) - Nuclear Fuel
• Renewable energy

  Biofuel

  Wind

  Hydroelectric

  Geothermal

  Tidal

  Solar

  Water
• Specific Heat Capacity

  The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree celsius
• Difference between Specific Heat Capacity and Specific Latent Heat. (6 marker)

  SHC is the amount of heat energy required to raise the temp of 1 kg of a substance by 1 degree Celsius

  SLH is the amount of heat energy required to change the state of 1 kg of a substance without changing its temp

  SHC is used to calculate the energy required to change the temp of a substance.

  There are two types of specific latent heat:

  • SLH of Fusion
  • SLH of Vaporisation

  Specific heat capacity applies when there is a change in temp but no change in state.

  SLH the temperature of the substance remains constant.
• difference between Specific Heat Capacity and Specific Latent Heat

  • Specific Heat Capacity involves a change in temperature with no change in state, measured in J/kg°C.
  • Specific Latent Heat involves a change in state with no change in temperature, measured in J/kg.
  • Specific heat capacity is concerned with the energy needed to heat or cool a substance, while specific latent heat is concerned with the energy needed for a substance to change its state.