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April 26, 2015

Homework Help: physics

Posted by sara on Saturday, September 19, 2009 at 5:21pm.

If you are holding a dumbbell in your hand, there are three forces acting, Weight of the arm pulling the arm down, a tension force that the muscle in the shoulder exerts on the arm, and the force that the dumbbell exerts on the fist.. which of these forces are contact forces?

some help would be appreciated!

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