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Mechanics - centre of mass lamina

  1. May 24, 2010 #1
    hi, I'm stuck and I cant seem to find a simple solution to questions regarding how to find the centre of mass of a lamina.

    for example:
    A uniform lamina with mass/unit area 0.12grams/cm2 consists of a square of
    side 80cm, with one corner at the origin O(0, 0) and other corners at B(80, 0),
    C(80, 80) and D(0, 80). A triangle of material has been removed from one corner
    by cutting a straight line from E(50, 0) to F(80, 40), and a particle of mass 0.5kg
    is attached at C. Find the coordinates of the centre of mass.
    If anyone could help me, that'd be much appreciated. thanks
  2. jcsd
  3. May 24, 2010 #2


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    Welcome to PF!

    Hi kolomsg! Welcome to PF! :smile:

    Do you know how to find the coordinates of the centre of mass of several bodies, given that you know the coordinates of the centre of mass of each?

    Apply that to the square, the triangle, and the particle, but with the triangle having negative mass! :wink:
  4. May 26, 2010 #3
    hi, thanks a lot. it helped!
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