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[Phys-L] Re: conservation of angular momentum question



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.

On Mon, 14 Mar 2005 20:54:34 -0500, John S. Denker <jsd@AV8N.COM> wrote,
in part:

To accelerate one of the cylinders, it is necessary and sufficient to
have a _moment_, i.e. a pair of forces separated by a lever-arm.
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