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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. The student uses the straw to blow air underneath
the paper. This causes a downward force on the paper, and it
moves down in the center.
Explanation: As the
air enters below the paper, the streamlines are curved. This
curvature allows the pressure to decrease below the paper. A
force is created from higher to lower pressure, and this force
pushes the paper down. |
