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Math Help - Vector Geometry

  1. #1
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    Vector Geometry

    A force F of 4 newtons acts through the point P(5,2,0) in the direction of a = 3i + j + 6k.
    Find the moment of the force about the point A(-2, 0, 1). Dimension are in meters.

    I'm stuck at start up to do this question.
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  2. #2
    Senior Member
    Joined
    Mar 2010
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    From definition the moment of the force is
    M = r x F - the cross product of two vectors.

    OP(5,2,0),
    OA(-2, 0, 1),
    a ( 3 , 1 , 6 ),
    | F | = 4 N.

    r = OP - OA.
    F = | F | a / |a| .
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