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Flight

Flight. Pressure and Area Relationship. Pressure decreases as the area over which a force is distributed increases . Consider snow shoes The SI unit of pressure is the newton per square meter ( N/m 2 The pascal (Pa): 1 N/m 2 = 1 Pa. Fluid Pressure.

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Flight

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  1. Flight

  2. Pressure and Area Relationship • Pressure decreases as the area over which a force is distributed increases. • Consider snow shoes • The SI unit of pressure is the newton per square meter (N/m2 • The pascal (Pa): 1 N/m2 = 1 Pa.

  3. Fluid Pressure • A fluid is a material that can easily flow • Particles in a fluid constantly move in all directions colliding with each other and with any surface that they meet.

  4. Fluid Pressure • All of the forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid.

  5. Remember… • Air is considered a fluid! • Because the force of gravity pulls down on this mass of air, the air has weight. The weight of the air is the force that produces air pressure, or atmospheric pressure.

  6. Air (atmospheric) Pressure • The weight of the atmosphere does not just press down • It presses is every direction • Pressures balance each other

  7. Unbalanced Pressure

  8. Changes in Fluid Pressure

  9. Changes in Fluid Pressure • As your elevation increases, atmospheric pressure decreases. • Water pressure increases as depth increases.

  10. Pressure and Moving Fluids • A fluid naturally flows from an area of highpressure to an area of low pressure. • Think: H comes before you get to L in the alphabet

  11. Bernoulli’s Principle • Bernoulli considered the relationship between speed and pressure. • Bernoulli’s principle states that the faster a fluid moves, the less pressure the fluid exerts. • In other words, as the speed of a moving fluid increases, the pressure within the fluid decreases.

  12. Why do we care about Bernoulli? Bernoulli’s Principle… • helps explain how planes fly, • helps explain why smoke rises up a chimney, • how an atomizer works, • how a flying disk glides through the air.

  13. Flight • Objects can be designed so that their shapes cause air to move at different speeds above and below them. • If the air moves faster above the object, fluid pressure pushes the object upward. • If the air moves faster below the object, fluid pressure pushes it downward.

  14. Designed for Lift

  15. Textbook Work Answers Please check your work!

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