Walt wrote:

Please see http://en.wikipedia.org/wiki/Torque , or if you're a stickler
for reliable sources, any elementary physics text like Hailliday and
Resnick, or Sears and Zemansky.

Ah, but do you have your copy of Halliday and Resnick at hand? I do.
Well, not while I'm actually skiing, but nearby. Next to the Handbook of
Chemistry and Physics.