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4 action and reaction
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4 action and reaction

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Transcript

  • 1. Action and Reaction
  • 2.
    • Newton’s 3 rd law of motion- to every action there is an equal and opposite reaction.
    • Ex: Trampoline. When a person jumps downward on a trampoline, the trampoline exerts an equal and opposite force upward.
  • 3.
    • What causes rockets to go into space?
    • The escaping gases from the rocket is the reaction while the rocket accelerates
  • 4.
    • Momentum - a property a moving object has because of its mass and velocity.
    • Ex: Speeding bullet has large momentum because of its high velocity.
    • Ex: Elephant has large momentum because of its large mass.
  • 5.
    • Law of conservation of momentum- the total amount of momentum does not change unless outside forces act on the object.
  • 6. Moving s = 20 m/s Stop s = 0 m/s
  • 7. Slow down s = 10 m/s Moving s =10 m/s
  • 8.
    • Momentum Equation
    • Variable Ending Units
    • P = Momentum kg m/s
    • m = mass kg
    • v = velocity m/s
    .
  • 9.
    • Momentum Equation
    • P = m X v
    • m = P / v
    • v = P / m
    . . . . X P m v

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