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Homework Help: Momentum of a free falling object

  1. Sep 5, 2012 #1
    1. The problem statement, all variables and given/known data
    In a physics exam I have this question: "what is the momentum of the weight force of an object in a free fall relative to its center of mass?"


    2. Relevant equations
    Is my answer right ?


    3. The attempt at a solution
    My answer is: "If we try to calculate the momentum, the center of reduction coincides with the center of mass, and the line of action of the force passes through the center of reduction, so the momenut is canceled"
     
  2. jcsd
  3. Sep 5, 2012 #2

    CWatters

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    I assume that should read..

    "what is the moment of the weight force of an object in a free fall relative to its center of mass?"

    Isn't the moment of the weight force allways zero because it allways acts through the center of mass?
     
  4. Sep 5, 2012 #3
    Ok yes i know that is zero the answer but can you explain me in details why ? (try to re-read my attempt at answering the question)
     
  5. Sep 6, 2012 #4

    CWatters

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