1. The problem statement, all variables and given/known data For context, the first question for this diagram asks for the force F on m1 needed to keep m3 at a constant height. The second question (which I'm struggling with) asks for the acceleration of m1 in the case where the force F=0. All surfaces are frictionless and I've assumed the rope is massless 2. Relevant equations 3. The attempt at a solution I'm not sure I even understand the question - are we to find the acceleration of m1 in the case where m3 is at a constant height as in the first part? If so, how can m1 accelerate if there is no force on it?