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The example was how a spinning ball was able to generate "lift" by
giving it a backspin,.... They authors gave an explanation that it was
due to the relative velocity of the top of the ball in respect to the
bottom of the ball.
I understand that as the velocity of air increases, the pressure
decreases, which ultimately leads to "lift".
If a ball has a backspin, isn't the bottom of the ball have a higher
relative velocity to the air?