Hair-drier and ball

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Newton was keenly interested in the phenomenon of air resistance and he introduced well known 'c' coefficients of aerodynamic resistance.

The values of these coefficients are: 0.8 for a cylinder, 0.47 for a sphere, 0.2 for a bullet. A parachutist relies on increased air resistance when falling down. Formula-1 racing cars are fitted with specially designed wings, which provide additional pressure to the wheels pushing them against the ground (and increasing the force of friction).

The balls on the films hover in the stream of air. Pushed from the side the balls return to the middle of the stream. It seems they reach the state of permanent balance, like always-up doll, the dancing dog's head, or like levitron in a well of the magnetic field.