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Plane Kinetics Moments

  1. Apr 21, 2010 #1
    where A Alpha is a rotation about an unknown point
    r is a vector form centre of a point O to the centre of mass

    Mo = IgA + rxma
    Does this mean in plane motion the moment about some points is different? I always thought the moment is a free vector.
    So can you apply Mo any where and get the some rotation A?

    Mo = IoA which is true when o is fixed

    Mo = IoA = IgA + rxma is this correct?

    Also In my text there is a formula

    Mo = IoA + rxmao

    i don't really understand the last term though. In a physical sense what does it mean?
  2. jcsd
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