The Bernoulli Principle - Lift. Summary. The Bernoulli Principle - the statement that an increase in the speed of a fluid produces a decrease in pressure and a decrease in the speed produces an increase in pressure
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Summary • The Bernoulli Principle - the statement that an increase in the speed of a fluid produces a decrease in pressure and a decrease in the speed produces an increase in pressure • Right. The long and short of this is, without this principle you wouldn’t be able to go on holiday, learn to be a pilot or enjoy the feeling of sitting in an airport for five hours waiting. The Bernoulli Principle explains in part how planes (among other things) are able to take off, then stay in the middle of the sky without crashing. Lift, air pressure and speed are all vital to this principle.
Quick Example • Q: Take two sheets of paper and hold them a few centimetres apart. Now, gently blow between them. What did you expect to happen? What actually happens? • A: The sheets move together, instead of moving apart, as you would expect. This is all down to air pressure, as explained in the next slide.
How it works. • The sheets of paper move together because you’re making the air between them move faster.The important thing about air (or water, or any other kind of liquid/gas) has a lower pressure when moving than when it is stationary. Because there’s low pressure between the pages, the higher pressure on the outside forces them together. The same thing happens on a plane’s wing. The top of the wing is designed to make the air travel further over it than the underside. This forces the air to move faster to cover the same distance over the top of the wing, lowering the pressure. This produces lift.
Other Examples of Bernoulli • Self Bailers – These allow boats to drain water off the deck by using holes in the base while still moving through the water. The fast movement of the boat in the liquid causes a drop in pressure, forcing the water out of the pipes. • Baseball – Bernoulli’s principle plays it’s part in curveballs. The spinning motion of the ball creates different wind speeds. Different speeds = different pressures, so the ball curves off to the left or fight.
Acknowledgments • http://www.suite101.com/content/bernoullis-principle-examples-a15812 Suite101.com • http://home.earthlink.net/~mmc1919/venturi.html Earthlink.net, for clarifying certain points and providing a brilliant (if slightly complex) flash demonstration. • http://www.centennialofflight.gov/essay/Dictionary/bernoulli/DI9.htm CentennialOfFlight.gov • http://www.bbc.co.uk/bang/bernoulli_principle.shtml Bang Goes the Theory for further notes and whatnot.