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Bernoulli's
Principle
Materials:
Procedure #1:
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Using a pencil, puncture
a large hole in the bottom of the cup.
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Place ping pong ball
inside the cup so that it covers the hole.
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Blow up through the
bottom of the cup and blow the ball out of the cup.
Procedure #2:
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Using a pencil, puncture
a large hole in the bottom of the cup.
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Invert the cup. Place
ping pong ball up inside the cup so that it covers the hole.
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Blow hard and steady
down through the hole. Release your support of the ball after you
start to blow.
Discussion:
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Did the ball react in
the way you expected? Why could it not be blown out of the cup?
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In #2, was there a force
that overcame the attraction of gravity?
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How does this show that
air increased in velocity, is decreased in pressure?
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What is the relative
strengths between the air pressure moving up through the bottom and
the normal air pressure above the ball?
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