1. The problem statement, all variables and given/known data Two particles move in a central potential. The potential has the form V(r1, r2)=-a/(/r1-r2/^1.5).... 2. Relevant equations 3. The attempt at a solution I am having trouble understanding what it means for two particles to move in a central potential. From what I understand a central potential is a force field whose force on any given particle points in the direction of a specific point and whose magnitude only depends on the distance r from that point. Does V(r1,r2) mean the sum of the potential energies of the two particles? This doesn't seem to make much sense based on the definition of V(r1,r2).