What is energy?

• What is energy?

  energy allows things to change

  • a car to move
  • chemicals to react
  • to kick a ball
  • to cook food
• different stores of energy:

  • chemical - internal
  • thermal
  • electrical
  • kinetic
  • elastic
  • gravitational
  • magnetic
  • nuclear
• when changes occur, energy is moved from one store to another.
• energy is a moving care:

  chemical store of the petrol -> kinetic store of the car -> thermal energy store of surroundings
• UNIVERSAL PHYSICAL LAW:

  energy cannot be created or destroyed.
• The total energy stored in a system remains the same.