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We are currently doing moments in physics and I have seen this in a few homework problems but can't seem to grasp it.

For example, in one question, we are given a new axis AA that is parallel to the y axis but is 150j and -100k (150, y, 100) (infinitely long in the y axis?) and the question wants the moment about that new axis AA.

My thinking is that I can take the projection about the y-axis or something along those line (I believe my thinking is completely off here)

M = u (r x f)

where r would be the position vector from the origin to anywhere on the AA axis.

F is the components of the force

u being the unit vector, and where I'm completely clueless.

Again, sorry for the lack of diagram or question, because this is more of a general question that applies to moments in general and axis's that are not touching the origin