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Moments - Balancing a weighted meter stick

  1. Jan 17, 2013 #1
    Moments -- Balancing a weighted meter stick

    A meter stick is found to balance at the 49.2cm mark when placed on a fulcrum. When a 46.0g mass is attached at the 14.7cm mark, the fulcrum must be moved to the 38.7cm mark for balance. What is the mass of the meter stick?

    I know I have to use moments but I don't know where to start. Any help would be appreciated.
     
  2. jcsd
  3. Jan 17, 2013 #2

    berkeman

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    Staff: Mentor

    Re: Moments

    Draw FBDs for the two situations, and show the torques about the fulcrum. When the stick is balanced, what must the sum of the torques be?

    (BTW, I will add some more descriptive words to your thread title -- 1-word titles are not generally allowed in the technical PF forums.)
     
  4. Jan 17, 2013 #3
    Re: Moments

    Thanks. Once I drew the FBDs, I got the answer. :D
     
  5. Jan 17, 2013 #4

    berkeman

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    Staff: Mentor

    Re: Moments -- Balancing a weighted meter stick

    Sweet! :smile:
     
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