1. The problem statement, all variables and given/known data A man pushes on a piano with mass 190 kg ; it slides at constant velocity down a ramp that is inclined at 17.0 ∘ above the horizontal floor. Neglect any friction acting on the piano. A. Calculate the magnitude of the force applied by the man if he pushes parallel to the incline. 2. Relevant equations Sum of forces = ma My question is not regarding the solution. I'm aware that the solution is mgsin(theta) but my question is how come there is no acceleration, yet there is only one force in the positive x direction since it says there is no friction. And why does the man push exactly as hard as the component of gravity in the x direction? I can see where the answer comes from, just not why.