This resource includes the following topics: Groups, advantages of groups, experiment 1: visualizations, gravity - electricity, potential energy and potential, gravity: force and work, work done by earth?s gravity, work near earth?s surface, potential energy, gravitational potential, prs question: masses in potentials, electrostatics, gravity - electrostatics, potential and energy, potential landscape, potential created by pt charge, deriving E from V, configuration energy, and in class problem.