As a Gedanken experiment, is it possible that inertia could be have a free energy aspect to it, if it is slightly more persistent than thought?
Say you have a rotor that absorbs energy when accelerated and sheds it during deacceleration ( as loaded then) – if you quickly switch between these states, is it possible that it persists in rotating during deacceleration to a tiny degree in excess of what conservation would suggest? Hence, overunity/free energy during brief moments……