1. The problem statement, all variables and given/known data A horizontal force fo 190N is needed to pull a 70kg box across a horizontal floor at a constant speed. What is the coefficent of friction between the box and the floor? 2. Relevant equations Fnet = ma 3. The attempt at a solution My setup is F - F_f = m*a But I have trouble getting the acceleration..... F_f is supposed to be F_f = N * u I am guessing F_f is knifectic fricition? Is it 190N? I am confused. Please help!