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When the ball is suspended in the airstream, the air flowing upward hits the bottom of the ball and slows down, generating a region of higher pressure.

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Presentation on theme: "When the ball is suspended in the airstream, the air flowing upward hits the bottom of the ball and slows down, generating a region of higher pressure."— Presentation transcript:

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3 When the ball is suspended in the airstream, the air flowing upward hits the bottom of the ball and slows down, generating a region of higher pressure. The high- pressure region of air under the ball holds the ball up against the pull of gravity.

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7 Why don't things fall off to one side? Can you see that whenever a hovering object wobbles out near the edge of the air stream, it seems to be pushed back towards the faster- moving air in the middle?

8 Moving air also exerts pressure. However air moving along the surface of an object pushes against the object with less pressure than still air. To demonstrate this, tear off a piece of newspaper about two inches wide by six inches long. Pick up the piece of paper by one corner and hold it in still air. Air is pushing equally on both sides of the piece of paper.

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