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Published byCorey Cobb Modified over 9 years ago
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WHAT HAVE WE SEEN SO FAR? A brief recap…
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So far, we have looked at fluids and we have seen that fluids exist as both liquid and as air. FLUIDS We have also seen how a fluid passes around an object.
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Bernoulli noticed that pressure exists all around us. In fact, he found that stationary fluids such as air and water exert pressure in all directions. BERNOULLI’S PRINCIPLE
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Bernoulli also discovered that the faster air flows, the less pressure it has.
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Now, we are going to look at the force of LIFT and see how it applies to flying objects such as airplanes.
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FLYING WINGS
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Airplanes stay in the air because of the shape of their wings.
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Imagine a wing without it’s skin on
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Imagine a wing flying fast through the air DIRECTION OF AIRPLANE
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The special shape of a wing is called an airfoil.
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An airfoil is flat on the bottom and curved on the top. BOTTOM TOP
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BOTTOM DIRECTION OF AIRPLANE
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How does a wing rise as air passes around it?
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When air hits the front of the wing it splits up
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The air flowing over the curved top of the wing has further to go than the air going under the flat bottom of the wing.
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Predict: How will both air molecules arrive at the tail of the wing at the same time if the molecule on top has a farther distance to travel?
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For the two streams of air to reach the back of the wing at the same time, the top stream must travel faster than the bottom. (It has a farther distance to go.)
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This fast moving air creates a low pressure area on the top of the wing and a high pressure area on the bottom of the wing. (Bernoulli’s Principle) LOW PRESSURE HIGH PRESSURE
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Predict: What is our high pressure air zone going to do? Why? LOW PRESSURE HIGH PRESSURE
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Air will move from a high pressure zone to low pressure zone. As it pushes against the wing, lift is created. LOW PRESSURE HIGH PRESSURE
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UP
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AND
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AWAY!!!
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