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Fluids and Pressure

Fluids and Pressure. Chapter 3. Fluids. Any material that can flow and take the shape of its container *Fluids include gases and liquids. All Fluids Exert Pressure. Remember Boyles Law . Calculating Pressure. Pressure = Force / Area Area = Force / Pressure SI unit for pressure is pascal

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Fluids and Pressure

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  1. Fluids and Pressure Chapter 3

  2. Fluids • Any material that can flow and take the shape of its container *Fluids include gases and liquids

  3. All Fluids Exert Pressure • Remember Boyles Law

  4. Calculating Pressure • Pressure = Force / Area • Area = Force / Pressure • SI unit for pressure is pascal • Written 1 Pa • Remember • Force = Newton • Area = m2

  5. Math Break • Turn to Page 62 • Find the pressure exerted by 3,000N crate with an area of 2m2 Hint: Pressure = Force / Area

  6. Solution Force = 3000 N Area = 2 m2 Pressure = ? Pressure = 3000N / 2 m2 = 1,500 Pa

  7. Question 2 • Find the weight of a rock with an area of 10 m2 that exerts a pressure of 250 Pa

  8. Solution Area = 10 m2 Force = ? Pressure = 250 Pa Force = 250 Pa x 10 m2 = 2,500 N

  9. Atmospheric Pressure • The small amount of pressure (weight) caused by the Atmosphere • Approx: 101,300 N or 101,300 Pa • http://www.wfu.edu/physics/demolabs/demos/avimov/fluids/marshmallow_man/marshmallow_man.MPG

  10. Example

  11. Water Pressure • Increases with depth • Is denser than air so it exerts more pressure

  12. Fluids Flow from High Pressure to Low Pressure • Think about drinking straws

  13. Pascal's Principle • Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container. • http://webphysics.davidson.edu/physlet_resources/bu_semester1/c23_pressure_pascal.html • http://www.wfu.edu/physics/demolabs/demos/2/2b/2B2042.html

  14. Automobile Hydraulic Lift

  15. Quick Lab • Page. 66 • Turn in question 6 • Page 64 Questions 1-3

  16. Buoyant Forces • The upper force that fluids exert on an object

  17. Law of Archimedes: • The buoyant force is equal to the weight of the replaced liquid or gas. • http://www.youtube.com/watch?v=vJ36urazDu4

  18. Weight vs Buoyant Force • Use figure 10 on page 69 • Draw 3 objects not listed in picture that would • Sink, Float and Float on the surface of water • Draw forces using arrows

  19. The Mystery of Floating Steel *Remember D= m / v

  20. The swim bladder allows fish to change there density This allows them to float at different depths How does increasing volume affect the fishes floating? How Fish Float

  21. Page 71 • Quick Lab: Ship-Shape • Turn in Question 3 • Due Before the end of Class • Homework Page 72 (1-3)

  22. Homework • Page 72 Question (1-4)

  23. As speed of a moving fluid increases, it’s pressure decreases Swiss Mathematician Example Shower Curtain Bernoulli’s Principal

  24. Page 73 • Quick Lab • Turn in a Diagram of results and Question 3 • Label High and low pressure • Page 77 (1-4)

  25. b Hold one end of a small sheet of paper in both hands. Keep the held edge horizontal while the other end sags under its own weight. Blow steadily over the top of this horizontal edge. Quick Lab

  26. Terms To Know The upward force that pushes against gravity The forward force produced by fling object (planes engine) The fluid force the opposes motion of the object

  27. Wings are Not a Requirement for Flight Curveball exhibit Bernoulli’s Principal

  28. Biplane Airship Jet Glider Pick any two of the following aircrafts and compare and contrast them in terms of lift, drag, thrust and gravity? What are the characteristics of each that allow them to fly?

  29. Short Review • Fluids in Pressure • Pressure in Atmosphere • Pressure under water • Altitude and Pressure • Buoyant Forces • Sinking, Floating, Buoying up • Archimedes Principle • Density • Bernoulli’s Principal • Fluid speed effect pressure How? • Airplane Terms

  30. Study Guide Time Test March 10th Lets Make A’s

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