Now let's look at the different types of potential energies that exist. Potential energies are energies due to positional placement in space, three types exist. Rough mass is the energy due to a stationary mass. Now, any mass has energy, and Einstein showed this with the equation E equals MC squared. The larger the mass, the larger the energy. Electrostatic energy is the energy due to the attraction and repulsion of the protons in the nuclei or the nucleus and the electrons in the electron cloud, okay?