1. With respect to any oscillating system, what is the difference between ΔPE, PE, and PEaverage? 2. Relevant equations ---- 3. The attempt at a solution Hi all. I want to preface this by saying that we have been discussing the Lennard-Jones potential and particle theory in class recently, after learning spring-mass potential energy dynamics. So I was thinking, ΔPE is the change in potential energy from some initial point to some final point.. so it is really a measure of CHANGE in the potential to do work... I was thinking that plain PE is like the instantaneous potential energy at a specific point in the oscillation.. and it is often arbitrary based on where we set our coordinate system. I struggle with PEaverage because it is not a term we have used in class before; but my attempt is that it is just the mean value of potential energy over some stretch of time. What do you guys think?