In this scenario, the student is a passive participant in the process. The information learned is impersonal. Clearly, the teacher is in control of the learning process; his or her interests dictate what and how fast the students learn.
The answer in all three cases is that rudder is used to help maintain stability in the roll. A little rudder at just the right time can help keep the nose up in a slow roll or even an aileron roll, as the plane rotates through the sideways portions of the roll when gravity is otherwise not countered.
Although Lawrence Mott in his comprehensive treatment of the history of the rudder, Timothy Runyan, the EncyclopÃ¦dia Britannica, and The Concise Oxford Dictionary of English Etymology classify a steering oar as a rudder, Joseph Needham, LefÃ¨bre des NoÃ«ttes, K.S. Tom, Chung Chee Kit, S.A.M. Adshead, John K. Fairbank, Merle Goldman, Frank Ross, and Leo Block state that the steering oar used in ancient Egypt and Rome was not a true rudder and define stern-mounted rudder used in China as the ...