energy

• energy can only be transferred and stored
• the energy stores are

  thermal, kinetic, chemical, gravitational potential, elastic, magnetic, electrostatic and nuclear
• work done = force x distance
• kinetic energy is movement in an object
• kinetic energy = 1/2 x mass x speed squared


  1/2 x 2500 x 20 squared = 500000J
• GPE = mass x height x gravitational field strength
• GPE store is transferred to its kinetic energy store when an object is falling
• elastic potential energy = 1/2 x spring constant x extension squared
• energy cannot be created or destroyed
• efficiency = useful work done / total work done
• conservation of energy states that the total amount of energy remains constant during any process, it can only change from one form to another.