Physics topic 1 mind map

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  • PHYSICS TOPIC 1 -  ENERGY
    • A SYSTEM IS AN OBJECT OR GROUP OF OBJECTS
      • WHEN A SYSTEM CHANGES, THE WAY ENERGY IS STORED CHANGES
        • E.G A BALL HITTING A WALL
          • SYSTEM IS THE MOVING BALL
          • WHEN IT HITS THE WALL , SOME OF THE ENERGY IS TRANSFERRED AS SOUND
        • E.G A VECHICLESLOWINGDOWN
          • SYSTEM IS THE VEHICLE MOVING
          • WHEN IT SLOWSDOWN , KINETIC ENERGY TRANFERS TO THERMAL DUE TO FRICTION BETWEEN WHEELS AND BRAKES
    • CALCULATING ENERGY
      • GRAVITATIONAL POTENTIAL           Ep=mgh
      • ELASTIC POTENTIAL         Ee=1\2ke2
      • SPECIFIC HEAT CAPACITY E=mc?t
      • KINETIC ENERGY   Ek=1\2mv2
      • POWER          p=w/t
    • ENERGY TRANSFER
      • ENERGY CAN BE STORED USEFULLY , STORED OR DISSIPATED BUT CANNOT BE CREATED OR DESTROYED. ENERGY CAN BE DESCRIBED AS BEING WASTED
      • REDUCING ENERGY WASTE
        • LUBRICATION
          • REDUCESFRICTION
          • OIL IN A MOTOR
          • SO LESS ENERGY IS LOST(AS THERMAL) THROUGHT FRICTION
        • THERMALINSULATION
          • LESS USEFUL THERMALENERGY LOST
          • DOUBLE GLAZING
    • NATIONAL AND GLOBAL ENERGY RESOURCES
      • WIND            RENEWABLE
        • electricity generated
          • does no provide constant source of energy
      • SOLAR RENEWABLE
        • electricity generation and some heating
        • depends on light intensity , so no power at night
      • TIDAL       RENEWABLE
        • electricity generation
        • high set up cost and can destroy habitats / cause problems for shipping
      • COAL        NON-RENEWABLE
        • electricity generation, heating and some transport
        • burning produces green house gasses
      • NUCLEAR FUEL        NON-RENEWABLE
        • electricity generation and some military transport
        • produces only radioactive waste and no emissions costly to build and reliable output
      • GAS                NON-RENEWABLE
        • electricity generation, heating and some transport
        • reliable output , burning produces CO2

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