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Collision Problem and Newton's 2nd Law

  1. Nov 9, 2006 #1
    How do car bumpers that collapse on impact help to protect a driver?

    According to the law of conservation of momentum, p = mv.
    Newton's 2nd Law is F = ma, or F = mv/t.
    So as t increases, F would decrease, thus less force would be acting on the car at a given time interval.

    Any suggestions and comments?:rolleyes:
  2. jcsd
  3. Nov 10, 2006 #2
    Yes, thats about it. You could also probably analyse it in terms of energy in the sense that the car bumper converts kinetic energy into elastic potential energy.
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