1. The problem statement, all variables and given/known data A rope exerts a force of magnitude 21 N, at an angle 31 deg above the horizontal, on a box at rest on a horizontal floor. The coefficients of friction between the box and floor are Us = 0.55 and Uk = 0.50. The box remains at rest. Determine the smallest possible mass of the box. 2. Relevant equations U= Ff / Fn 3. The attempt at a solution I dont know how to go about it yet, Sorry. So far i drew a FBD which i believe is correct. Any help with themethod would be appreciated.