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Oct28-06, 05:00 PM
P: 178
Well, the trouble with plain free body diagrams is that they don't show both torques and forces. I think the professor is ok with the format of the diagrams, but your advice about adding individual force vectors to the weights is well taken.

One other question: in diagram four, does there need to be a torque vector pointing "out of the page" on the left side of the pivot point? I believe I need to add this, since (W-left side of ruler) * (moment arm from pivot to left side of ruler center of mass) is > 0.