WHY? This is Bernoulli's Principle in action: Faster moving air from the hair dryer exerts a lower pressure than slower moving air outside the airstream. If the ball move to the edge of the blowing air. The low pressure at the center of the airstream "lifts" or pulls the ball back into the center of the fast moving air. ASSESSMENT: Can the student communicate what they observed?

The students is able to communicate that the faster moving air at the center of the airstream has less pressure than the air outside, thus causing lift. The student is able to communicate that faster air above the ball changes pressure. The student is able to communicate that the ball "flies" because of the stream of air. The student is able to communicate that the ball "flies".

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Last modified: Thu Mar 5 16:25:16 PST 1998

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