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Newton's 3rd law and its affect

  1. Mar 4, 2009 #1
    1. The problem statement, all variables and given/known data
    When a bike crashes into a metal fence why does the fence bend when the magnitude of the forces that they exert upon each other are the same?

    2. Relevant equations

    FAB = -FAB

    3. The attempt at a solution

    I think this is becuase the bike has more mass than the fence.... but i am not sure how this is applied.
  2. jcsd
  3. Mar 4, 2009 #2
    no f=ma so the mass is already accounted for, should certain materials or apparatuses be able to withstand more force than others?
  4. Mar 4, 2009 #3
    and you also have to remember that the opposite forces work on different bodies
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