# phy

When you push a 1.82-{\rm kg} book resting on a tabletop, it takes 2.21 N to start the book sliding. Once it is sliding, however, it takes only 1.52 N to keep the book moving with constant speed.
1-What is the coefficient of static friction between the book and the tabletop?
2-What is the coefficient of kinetic friction between the book and the tabletop?

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asked by pop
1. forcefriction=pushing force when..

mu*mg=2.21 solve for mu, then do it again for kinetic coefficent.

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