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Clarification in the definition of force

  1. Sep 4, 2013 #1
    \According to Newton's second law, force is defined as rate of change of momentum or force is defined as product of mass into acceleration, I both of these definitions are same and right.

    My questions are,
    (1) how can i prove this two definitions are same?
     
  2. jcsd
  3. Sep 4, 2013 #2
    F=dp/dt=d(mv)/dt=m(dv/dt)=ma
    Actually, these two definitions are not equivalent in the framework of special relativity.
     
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