1. The problem statement, all variables and given/known data http://img258.imageshack.us/img258/7172/testiiifo2.jpg Here is an image of the problem (taken from a practice test.) 2. Relevant equations F=ma 3. The attempt at a solution I drew the free body diagrams for each, but I have no idea what the equation would be. I came up with equations for each mass, and solved for a in one, plugged into the other and got this. Tension Force (string, m2) - Grav Force (earth, m2)=M2*((-tension force string, M1)/m1) This doesn't appear to me to be a position equation.. please help.