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Homework Help: How do you calculate Center of mass

  1. Mar 23, 2010 #1
    1. The problem statement, all variables and given/known data

    I'm confused about how to find the center of mass
    http://www.screencast.com/users/ntrinh3/folders/Jing/media/a9773d23-38f1-4d28-a6f8-3b681d42d4c2

    and

    http://www.screencast.com/users/ntrinh3/folders/Jing/media/bfb40c40-0068-41e8-ac83-2146e1df3330

    2. Relevant equations
    So the equation my professor gives Cm=sum of MR/sum of masses


    3. The attempt at a solution
    Where exactly is this R reference point?
     
  2. jcsd
  3. Mar 23, 2010 #2

    rock.freak667

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    You just pick a point, for example if you pick your reference as the 2kg mass, then your COM will be measured from there.
     
  4. Mar 23, 2010 #3
  5. Mar 23, 2010 #4

    rock.freak667

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    Homework Helper

    MX=m1x1+m2x2+m3x3+...

    the 'x's are measured relative to wherever you take your reference point as.
     
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