Final answer:
The illusion of rotation on a different axis in prolonged constant rate turns and abrupt head moves is called the Coriolis force.
Step-by-step explanation:
The illusion of rotation on a different axis while making prolonged constant rate turns in IFR and abrupt head moves is called the Coriolis force.
This fictitious force is a result of the observer's frame of reference accelerating or rotating. It may seem real because of the sensation experienced by the observer, but it does not actually exist as a physical force.
Examples of situations where the Coriolis force is observed include taking off in a jet airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone.