When you push a 2.05 kg book resting on a tabletop it takes 2.45 N to start the book sliding. Once it is sliding, however, it takes only 1.50 N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between the book and the tabletop? static? kinetic?

Answer 1

F1 = force to start movement
μs = coefficient of static friction
F2 = force to maintain movement
μk = coefficient of kinetic friction
m = mass

The coefficients of friction are defined as follows:

F1 = μs*mg
F2 = μk*mg