Work & Energy

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  • Created by: Jo Wells
  • Created on: 28-12-12 13:38
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  • Work & Energy
    • "When a force moves an object through a distance, ENERGY IS TRANSFERRED and WORK IS DONE"
      • Work Done (J) = Force X Distance
        • W = F X d
    • Gravitational Potential Energy
      • = Energy due to Height
      • Gravitational Potential Energy = mass X gravitational field strength X height
        • GPE = m X g X h
    • Kinetic Energy
      • Depends on mass & speed
        • More it weighs & the faster it's going = bigger kinetic energy
      • Kinetic Energy transferred = work done
        • A moving car = lots of kinetic energy & to slow it down, the energy needs to be converted to other types of energy
          • Kinetic energy needs to be converted to heat energy (as FRICTION between wheels & brake pads) = temperature of brakes rises
            • Kinetic Energy Transferred = Work Done by Brakes
              • 1/2 X m X v squared = F X d
      • Falling Objects convert POTENTIAL energy into KINETIC energy
        • Gravitational Potential Energy
          • = Energy due to Height
          • Gravitational Potential Energy = mass X gravitational field strength X height
            • GPE = m X g X h
        • Kinetic energy GAINED = Potential energy LOST
        • Some is also transferred to HEAT & SOUND

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