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Homework Help: Help with centre of mass please

  1. May 2, 2006 #1

    its question number 10

    hi all i was wondering if you could help me with my centre off mass question sthanks

    the diagram shows a thing uniform sqaure of metal which has a corner folded over. Calculate the distance the centre of mass of ABCDEF is from A

    thanks you
  2. jcsd
  3. May 2, 2006 #2


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    Staff: Mentor

    So what techniques do you use to calculate the center of mass of an object? You need to show us how you are starting to solve the problem....
  4. May 2, 2006 #3
    i used or tried centr mass of triangle =1/3 height and 1/3 width i then used centre mass of square is 1/2 base and 1/2 height.

    i then took the triangle away from the sqaure a little like this

    centre of mass of triangle
    x=4+4/3=5 and 1/3
    y=4+4/3=5 and 1/3

    centre of mass of sqaure =

    mass of square - 8x8=64
    mass of triangle - 4x4=16

    i tried distance between two points is [(x1-x2)^2+(y1-y2)^2)]^0.5

    but it didnt work :(

    just wondered where im going wrong
  5. May 2, 2006 #4


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    Staff Emeritus
    Science Advisor
    Gold Member

    You may want to check the x distance for your COM of the triangle. And also the mass of your triangle.

    Last edited: May 2, 2006
  6. May 2, 2006 #5
    thyanks buddy i got it now
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