1. The problem statement, all variables and given/known data A dog pulls a sled with unspecified force at 25° above horizontal. Mass of sled-passenger-rope partile is 80 kg and there is negligible friction. Find the maximum magnitude of force F that can be applied to the rope without lifting the sled off the surface. 2. Relevant equations sum of forces = ma normal force is Fn mass of particle is m 3. The attempt at a solution Fxnet = Fcos(25) = max Fynet = Fsin(25) - 9.8*m + Fn In any case where the sled is not lifted, Fynet = 0, since acceleration is in direction of x only (for this problem). However, I am confused about how to find maximum force before sled is lifted.