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Relativistic vs non-relativistic momentum

  1. May 3, 2007 #1
    The question ask to find the momentum of a particle with mass 1g moving with half speec of c and then compare the answer with the result using relativistic formula for momentum. Do I just use p=mv for non relativistic and p=mv/(1-v^2/c^2)^1/2 and put them equal to each other to find the relationship? Thanks:biggrin:
  2. jcsd
  3. May 4, 2007 #2


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    Those are the right formulas. When asked to compare to quantities, usually you can answer that by stating which quantity is bigger, which is smaller etc. That's all they are asking for.
  4. May 4, 2007 #3


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    If you wanted to be more precise you could find the ratio of classical to relativistic momentum.
  5. May 4, 2007 #4


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    Or you could find the percentage difference between the two, e.g. "the relativistic momentum is 4.2% larger than the classical momentum."
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