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Inertia tensor punctual masses

  1. Sep 18, 2014 #1
    1. The problem statement, all variables and given/known data
    Hi everyone, I need some help to know how to find the components of the inertia tensor matrix of a rigid body formed by a gruop of point masses attached to bars with no mass.
    I have 3 masses with cartesian coordenates: 1 (a,a,0), 2 (a,0,0) and 3 (-a,-a-0).

    3. The attempt at a solution
    The book says: Ixx= 2ma^2, Ixy= -2ma^2, why??

    Thank you!
  2. jcsd
  3. Sep 18, 2014 #2


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    Gold Member

    Welcome to PF!
    Do you know the general formulas for the elements of the inertia tensor? That would be a good place to start.
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