Discussion
The ............................... effect is the commonly observed effect in which a spinning ball curves away from its principle flight path.
Answer: C
It is the Magnus effect.
A spinning ball drags a thin layer of air round with it. On one side the spin adds to the airflow speed and on the other it opposes it, so the pressure is lower on the faster side, and the ball is pushed towards it. This sideways force bends the flight of a swinging free kick in football, topspin and slice in tennis, and the hook or slice of a golf ball.
Buoyancy is the upward force of a fluid on an immersed body. 'Physical effect' and 'magnitude effect' are not names for the curve of a spinning ball.
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