1. The problem statement, all variables and given/known data A person is dragging a packing crate of mass 100 kg across a rough floor where the coefficient of kinetic friction is 0.400. He exerts a force F just sufficient to keep the crate moving at a constant velocity. At what angle above the horizontal should his pulling force F be for it to be minimum? 2. Relevant equations Frictional Forces = UkN 3. The attempt at a solution Frictional Force = Uk(mg)(cosx) Im stuck.