Posted by Anonymous on Wednesday, March 10, 2010 at 11:29am.
Constant velocity means that the forces add up to zero.
Do a force balance in the direction of motion. It says:
10.0 cos 60 = friction force = (M g - 10.0 sin 60)*Uk
Solve for Uk, the coefficient of (kinetic) friction.
The reason for the -10.0 sin 60 term is that the upward pull on the rope reduces the normal force of the sled onto the ice. That term gets subtracted from the sled's weight.
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