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Procedure:
The books are placed on a desk side by side with a space in
between them. The paper is placed over both books so that it
bridges them. Using a straw, blow air underneath
the paper. This causes a downward force on the paper, and it
moves down in the center.
Explanation:
By blowing the air between the books, you have an increase in velocity and a decrease in pressure, thus a net downward force on the paper.
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