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Engineering Mechanics: Notation question

  1. Oct 1, 2014 #1
    In a problem involving moments where we have a 2 point is space: m and n.
    We want the moment about M due to a force applied at N.
    We know the equation is Moment = r (m/n) * F

    So, does r (m/n) represent the (x,y,z) coordinates from the point N to M or M to N?
     
  2. jcsd
  3. Oct 1, 2014 #2
    The direction has to be perpendicular to the applied force. So, if the force is applied along the y axis, the direction should be in x axis. Hope that helps.
     
  4. Oct 2, 2014 #3

    OldEngr63

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    Gold Member

    The calculation of a moment is usually done in vector (cross product) form,
    M = required moment (a vector)
    = rn/m x F

    Note that, in the subscript on r, the first item is the point where F is applied while the second is the reference point for the moment.
     
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