- #1
tave
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Hi all, this is my first post, so forgive me if this is in the wrong forum. (I believe it does belong here)
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
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