Explain dynamic lift with examples.

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Detailed Solution

Case I : Consider a ball at rest in air, the stream lines around the ball are symmetrically above and below the ball so pressure difference zero hence no dynamic lift acts on the ball.
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Case II:
1. Consider a ball is spinning about an axis perpendicular plane of the paper.
2. Spinning ball drags some air around with it. Velocity at point 1 and 2 are same but opposite sign. So no dynamic lift acts on the ball.

Case III : In this, spinning ball moves up in air. The streamline distribution will not be symmetrical so here dynamic lift acts on the ball.
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