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Statics - Impending motion, moments help!

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data
    The cup shown in the picture is filled with 6 oz of coffee. The center of gravity is located at G. If a vertical force is applied to the rim of the cup a shown in the picture, determine its magnitude so that the cup is on the verge of tipping.
    14vpbtd.jpg

    2. Relevant equations

    sum of moments = 0
    sum of forces = 0
    w=mg

    3. The attempt at a solution
    I summed the moments around point A and came up with the force = - .5 lbs.

    not sure if that's right, Do I need to factor in a normal force?

    Thanks!
     
  2. jcsd
  3. Oct 18, 2009 #2

    Delphi51

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    Homework Helper

    Looks good to me!
     
  4. Oct 18, 2009 #3
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