Saturday

April 19, 2014

April 19, 2014

Posted by **Anonymous** on Wednesday, March 10, 2010 at 11:29am.

horizontal surface of a frozen pond. The boy pulls on the rope with a force of 10.0 N; and the

sled moves with constant velocity. What is the coefficient of friction between the sled and the

ice?

- physics -
**drwls**, Wednesday, March 10, 2010 at 12:32pmConstant 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.

**Related Questions**

math - When a boy pulls his sled with a rope, the rope makes an angle of 70 with...

Physics - A 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake, ...

Physics please help!! - A 43.3 kg boy and a 60.0 kg girl are on the surface of a...

physics - A boy is sledding down a slope that is inclined at 30.0° with respect ...

Physics - The sled is stuck in the snow. A child pulls on the rope and finds ...

physics - boy pulls a toy cart of mass 2 kg with a force of 3 N at an angle of ...

physics - A 38.5 kg girl and a 57.0 kg boy are on the surface of a frozen lake, ...

physics - A 38.3 kg girl and a 55.4 kg boy are on the surface of a frozen lake, ...

physics - A loaded sled is pulled by means of a rope that makes an angle of 45.0...

Physics - A boy pulls a sled with a force of 40 N on a rope 2.5 meters long. The...