impact forces

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  • Impact Forces
    • When a force acts on an object that is able to move, or is moving, its momentum changes.
    • The longer the time taken for the change in momentum, the smaller the force that acts on it.
    • In a collision, the momentum of an object changes as a result of a force acting on the object.
    • force= change in momentum / time
      • F=    p/t
    • Crumple zones in cars are designed to fold in a collision. - increases impact time - force smaller - less risk.
    • Sear belts reduce force of impact - increase time - momentum changes - smaller force.


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