Question

The coefficient of static friction between a book and the level surface it slides on is 0.65. If the mass of the book is 2.0 kg, the minimum initial applied force required to slide the books across the surface is ___N.

Answer 1

F = mu*N, where mu = 0.65 is the coefficient of a static friction, N = m*g is a counterpressure
Thus, F = mu*m*g = 0.65*2.0*9.8 = 13 N.