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September 18, 2014

September 18, 2014

Posted by **Samantha** on Wednesday, October 13, 2010 at 10:36pm.

A box weighing 600 N is pushed along a horizontal floor at a constant velocity with a force of 250 N parallel to the floor. What is the coefficient of Kinetic friction between the box and the floor?

A block of wood is pulled by a horizontal string across a horizontal surface at a constant velotcity with a force of 20 N. What is the coefficient of kinetic friction between the surfaces?

- College (?) Physics -
**drwls**, Wednesday, October 13, 2010 at 11:08pm(1) 600 N is also the friction force, since it balance the pushing force for zero accleration.

The coefficient of friction is the ratio of friction force to weight.

(2) This is the same kind of problem as the previous one. They need to tell you the mass or weight of the wood in order to get a numerical answer.

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