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On 03/14/05 21:57, Daniel Crowe wrote:
Just a minor quibble:
A pair of (equal and opposite) forces separated by a lever arm is a
couple. There is a nonzero moment (torque) associated with any single
force if its line of action doesn't pass through the origin.
Yes, AFAICT it's minor ... but I'd like to understand
it anyway, and I'm not yet succeeding.
By the third law of motion, there is no such thing as a
"single force". So isn't there pretty much a one-to-one
mapping between torques and couples?
I habitually consider torque synonymous with moment. It's
been years since I heard, saw, or used the term couple,
and I'm not sure if it refers to an important concept.