Momentum, Energy and Work

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  • Work, Momentum and Energy
    • Equations
      • Work=Force applied x Distance
        • Force = newtons
          • Work = Joules
            • Distance = metres
      • Weight = Gravitational field strength x mass
        • GFS = 10N on earth
      • Change in gravitational potential energy = mass x GFS x height
      • Power = Energy÷time
      • Kinetic energy = 1/2 x mass x velocity
      • Momentum = mass x velcoity
      • M1V1 = M2V2
    • Gravitational potential energy is the energy from how high you are.
    • Mass is the amount of stuff inside you
    • Momentum is the measure of how much momentum there is in an object
      • During a collision, the law of conservation of momentum applies in a closed system - the total momentum before an event is equal to the total momentum after the event
        • For example: an 80kg rugby player ran at a velocity of 5m/s.... an 800kg car moves with the same momentum as the rugby player. Calculate the velocity of the car when the momentum of the rugby player moves at 400kgm/s: 800kg x velocity = 400kgm/s... velocity = 400/800 = 0.5m/s
    • Impact Forces
      • if you increase the amount of time involved in the collision then there is more time for the force to be dissipated out of the collision = less injuries
      • Decelleration = change in velocity / time


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