conservation of energy

• energy stores

  • thermal
  • gravitational potential
  • elastic potential
  • magnetic
  • chemical
  • electrostatic
  • nuclear
  • kinetic
• energy transfers

  • mechanically
  • electrically
  • heating
  • light / sound waves
• conservation of energy - can be stored or dissipated but not created nor destroyed
• dissipated - lost to surroundings
• efficiency = useful energy output / total energy input
• energy sources

  • fossil fuels
  • nuclear
  • biofuels
  • wind / solar
  • hydroelectricity
• moment - rotational / turning effect of a force
• moment = force X distance between force and pivot
• total clockwise moment = total anticlockwise moment
• lever - increases size of force acting on an object

  • help move / lift things
• gears - transmit the rotational effect of a force from one place to another