Experiment No. 5 Experiment: As with experiment 4, to examine Bernoulli's Principal - this time by suspending a ping pong ball on a cushion of air. Materials:
1) Bend your straw at the bendy part. 2) With the end of your straw in your mouth, get your ping pong ball and hold it just above your straw. 3) Blow really hard into the straw and let go of the ball. Be careful to hold the straw steady while blowing (or the ping pong ball will topple off!). 4) Now try the same experiment using a hair dryer. Try suspending two balls at the one time in the stream of air. Result: The ball appears as if suspended on a cushion of air. Conclusion: This is another example of Bernoulli's Principal in action. When you blow through a straw or turn on a hair dryer, the air moves fastest in the centre of the stream of air. This air is therefore at a lower atmospheric pressure that elsewhere in the air stream. This low pressure air is surrounded by slower moving air, or air moving at a higher pressure. The ping pong ball is therefore surrounded by higher pressure and this makes a virtual cage, trapping our ping pong ball.
Flying Counters | Under Pressure | Make Your Own Helecopters | Pressure Matters | Bernoulli's Principal
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