Energy Stores & Systems

• 8 types of energy stores

  1. thermal
  2. kinetic
  3. gravitational potential
  4. elastic potential
  5. chemical
  6. magnetic
  7. electrostatic
  8. nuclear
• energy is transferred

  • mechanically
  • electrically
  • by heating
  • by radiation
• energy is transferred when a system changes
• system

  a single or a group of objects
• closed systems are systems where neither energy or matter can enter or leave
• kinetic energy store

  • anything that is moving
  • energy is transferred when an object speeds up
  • energy is transferred away when an object slows down
  • kinetic energy store depends on objects mass and speed
• the greater the mass of an object the faster its going and more energy in kinetic energy store
• equation for kinetic energy

  Ek = 1/2mv^2
• gravitational potential energy

  • anything that is to do with lifting an object
  • amount of energy in a gpe store depends on the objects mass, height and strength
• the higher the object is lifted the more energy is transferred to the gravitational potential store
• equation for gravitational potential energy

  Ep = mgh
• when an object falls its energy from gravitational potential energy is store is transferred into kinetic energy store
• energy lost from gpe store = energy gained in kinetic energy store
• elastic potential energy

  • anything that stretches or squashes an object
  • epe can be worked out as long as the limit of proportionality isnt exceeded
• equation for elastic potential energy

  Ee = 1/2 ke^2
• specific heat capacity

  amount of energy needed to raise 1kg substance by 1 degrees celsius
• equation for specific heat capacity

  e=mc x temperature change