1. The problem statement, all variables and given/known data A horizontal force of 20 N is required to move an object with a mass of 8 kg along a horizontal floor with constant velocity. Find the coefficient of kinetic friction. 2. Relevant equations f = uN u = f/N 3. The attempt at a solution u = 20 N/(8 kg X 9.8 m/s2) u = 20 N/78.4 N u = 0.255 or 0.26 Is my answer correct? I'm confused with the mention of constant velocity. I know that one of the components of force is acceleration. Does it mean that acceleration is zero; therefore, there is no friction because velocity is constant? f = 0 X 78.4 N f = 0 ???