Could the accelerating rate of the expansion of the universe be due to the conversion of potential energy to kinetic energy? At the early stages of the big bang there would be tremendous amounts of potential energy (because it was so compressed). As it expanded, the universe, by the conservation of energy, would convert from mainly potential energy to kinetic energy. Because energy is the ability to work and work is a force quantity, if there was potential energy being constantly converted into kinetic energy force would be added. Forces accelerate, thus the universe would accelerate as it is being acted upon by the constantly additional kinetic energy.