1. The problem statement, all variables and given/known data A block of mass "m" is pulled across a rough table by a string at an angle "θ" above the horizontal at a constant velocity. What is an equation for the magnitude of the kinetic friction force, fk? The answer that I was given was μk(mg-T*cos(θ)) 2. Relevant equations Fk=Fn*uk mg*cos(theta)=magnitude of force in x direction 3. The attempt at a solution I just thought it would be mg*cos(theta)=uk*Fn Since there is no acceleration, the frictional force in the positive x direction must equal the force in the negative x direction...so, T*cos(theta), which is the same in this situation as uk*Fn. Why that weird answer? Anybody?