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Physics 10 Online
OpenStudy (anonymous):

Surfaces of copper and cast iron in contact have coefficient of static friction µs = 1.05 and coefficient of kinetic friction µk = 0.29. Suppose a 0.15 kg smooth block of cast iron resting on top of a copper surface is being pulled with a force of 0.50 N but does not move in response. What is the force of friction?

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