Speaking of scientific bullsh1t WRAITH, ideal circular motion is a constant energy motion.
It is indeed Mike, where have I suggested otherwise?
No energy is being expended because a balance exists between the central and the centrifugal force (force acts, but no displacement => no work done => no energy consumed), none of which we can dismiss from the consideration. Note that Newton explicitly mentions that
unbalanced force is required to change the state. This is where energy is consumed in the ideal case. In reality though, aerodynamic aspects come into play, but as I understand it that's exactly what the instructor didn't want to hear.
EDIT: Although yeah, if you want to get into aerodynamics, Beagle is spot on.