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April 21, 2015

Homework Help: Physics

Posted by Anonymous on Tuesday, December 5, 2006 at 11:28pm.

A 55 kg ice skater, initially at rest on a flat skating rink, requires a 198 N horizontal force to be set in motion. However, after the skater is in motion, a horizontal force of 175 N keeps her moving at a constant velocity. Find the coefficients of static and kinetic friction between the skates and the ice.

When motion is started, the applied force = (static friction coeff.) x (weight)
Use that relationship to get the static friction coefficient, and remember then weight = m g

When the skater is moving at constant speed, a similar relation applies
force = (kinetic friction coeff.) x (weight)

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