1. The problem statement, all variables and given/known data You are pulling a child up hill on a sled, walking at a constant v. The incline makes the angle theta with the horizontal, and the rope is parallel to the incline. The mass of the sled plus the child is M, and you pull with a constant force T. Start with making a sketch of the situation, and then draw a free body diagram of the forces acting on mass M (sled +child). Find the coefficient of kinetic friction between the sled and the snow, purely in terms of the given quantities and the acceleration of gravity g. 2. Relevant equations F=ma 3. The attempt at a solution For the free body diagram..I have as follows: mg pointing straight down in the negative g direction, the normal force pointing diagonally to the left,( positve j and negative i direction), and then Kinetic friction pointing down diagonally to the left (negative j and negative i direction.) Does this sound correct? What I am confused about is since the sled and child are treated as one system...there is no tension force right? What does it mean when they say the tension is constant?