WHY? This is Bernoulli's Principle: Faster moving air exerts a lower pressure than slower moving air. As the air moves between the card and the end of the spool, its speed increases and a lower pressure area is created. The air pressure below the card is greater and "holds" the card against the end of the spool. ASSESSMENT: Can the student communicate what they observed?

The student is able to communicate that the faster moving air between the card and the spool creates a lower pressure area. The higher pressure below the card makes it "cling" to the bottom of the spool. The student is able to communicate that faster air between the card and the spool changes pressure. The student is able to communicate that the card clings due to blowing through the spool. The student is able to communicate that the card clings.

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Last modified: Sun Aug 10 18:00:59 PDT 1997

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