Physics - OCR Gateway - Foundation Tier - P5

  • Created by: lala2127
  • Created on: 14-06-18 13:37
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  • Physics - P5
    • Energy and Energy Transfers
      • Energy stores
        • Kinetic
        • Thermal
        • Chemical
        • Gravitational potential
        • Elastic potential
        • Electrostatic
        • Magnetioc
        • Nuclear
      • Energy is transferred between energy stores
      • Law of conservation of energy
        • Energy can be transferred usefully, stored or spread out but can never be created or destroyed
    • Efficiency
      • Energy is wasted in energy transfers
      • Wasted energy is stored in less useful things
      • Efficiency = useful output energy/input energy transfer
    • Mechanical Energy Transfers
      • Kinetic energy = 1/2 x mass x speed2
      • Gravitational potential energy = mass x height x gravitational field strength
    • Elastic Objects
      • Springs can be stretched by forces
      • Transferred to the springs kinetic energy store
      • Energy transferred = 0.5 x spring constant x extension2
    • Electrical Energy Transfers
      • Electrical circuits transfer energy electrically
      • Electrical appliances have power ratings
      • Power = current x potential difference

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