Physics I Lab Manual 2011 55

Physics I Lab Manual 2011 55 - would increase to oppose...

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Experiment 7 Friction Objective To verify that the force of static friction obeys f s μ s N and the force of kinetic friction obeys f k = μ k N where μ s μ k and are independent of the area of contact. Theory Friction is a contact force that opposes the motion of objects. For objects that are stationary relative to each other the force of static friction between them has a magnitude that obeys f s μ s N , where N is the normal force between the objects and μ s is called the coefficient of static friction , a constant that depends on the materials in contact. If you were to gradually push harder-and-harder on an object sitting on a surface with friction, the force of friction
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Unformatted text preview: would increase to oppose your applied force, rising to the maximum value f s,max = s N before being overwhelmed by the applied force, at which point the block would begin to slide and kinetic friction with a magnitude of f k = k N would oppose the motion. Since the kinetic friction is not strong enough to prevent the motion it cannot be greater than the maximum force of static friction. According to these relationship the force of friction does not depend on the area in contact, only the materials. These relationships will be tested in this lab. 45...
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This note was uploaded on 01/27/2012 for the course PHY 2048l taught by Professor Staff during the Fall '08 term at University of Central Florida.

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