What keeps the ball above the stream of air?. Fluids in Motion Viscosity is the resistance of a gas or liquid to flow. Bernoulli’s principle states that.

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Presentation transcript:

What keeps the ball above the stream of air?

Fluids in Motion Viscosity is the resistance of a gas or liquid to flow. Bernoulli’s principle states that as the speed of a moving fluid increases, the pressure of the moving fluid decreases. Bernoulli’s principle is illustrated below: as a leaf passes through a drainage pipe from point 1 to point 2, it speeds up, and the water pressure decreases.

Bernoulli's Principle Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. Bernoulli’s animated

Curve of a Baseball A non-spinning baseball or a stationary baseball in an airstream exhibits symmetric flow. A baseball which is thrown with spin will curve because one side of the ball will experience a reduced pressure. This is commonly interpreted as an application of the Bernoulli principle and involves the viscosity of the air and the boundary layer of air at the surface of the ball.Bernoulli principleboundary layer The roughness of the ball's surface and the laces on the ball are important! With a perfectly smooth ball you would not get enough interaction with the air.

Airfoil The air across the top of a conventional airfoil experiences constricted flow lines and increased air speed relative to the wing. This causes a decrease in pressure on the top according to the Bernoulli equation and provides a lift force.