F ≤ μR
where F is the force of friction, R is the normal reaction force between the object and the surface, and μ is the coefficient of friction between the object and the surface
FMAX = μR
where FMAX is the maximum possible force of friction, and R and μ are as above
A box with a mass of 12 kg is at rest on a horizontal floor. The coefficient of friction between the box and the floor is 0.7 . A horizontal force of 80 N is applied to the box. Describe the force of friction in this situation and determine whether or not the box will begin to move.