Lu, I'll bring this back on topic.
"1) When you learned principles of flight for helicopters did your instructors use the term centrifugal force when addressing the loads on the blades or rotorhead or, did they use the term centripetal force?"
I can't remember. I would hope that they would have used centrifugal force and understood centripetal force, in case anyone asked. The point of a principles of flight course is not to make pilot wannabes into physicists. It's give them enough background so that they can understand what happens in flight.
"2) If you attended higher level classes in engineering and / or physics you most likely learned about centripetal force? If this is the case and your POF instructors addressed centrifugal force as opposed to centripetal force which theory do you embrace in your daily operations of your helicopter..."
The theory I use in flight is, "cylic forward, houses get bigger....". I'm not kidding. For day to day operations, neither arises. If we need to get into technical qualities of the helicopter, I think centripetal, but translate if required.