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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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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