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Forces in Fluids

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Forces in Fluids Chapter 13 What is pressure? The result of a force acting over a given area. Pressure = Force/Area What label? N/m2 1 N/m2 is known as a pascal (Pa ... – PowerPoint PPT presentation

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Title: Forces in Fluids


1
Forces in Fluids
  • Chapter 13

2
What is pressure?
  • The result of a force acting over a given area.
  • Pressure Force/Area
  • What label?
  • N/m2
  • 1 N/m2 is known as a pascal (Pa)

3
Blaise Pascal
  • 1623-1662
  • French physicist and mathematician
  • Performed some of the first experiments dealing
    with pressure

4
Fluid pressure
  • Fluids a substance that attains the shape of its
    container. Examples both liquids and gases.
  • Fluid pressure changes with depth in a column of
    water and with altitude.
  • Fluid pressure in water does not depend on the
    volume or weight only the depth.

5
Air Pressure
  • Air pressure at sea level is approx. 101 kPa.
  • Air pressure will decrease with increases in
    altitude.
  • Examples flying in a plane, driving in the
    mountains

6
Pascals Principle
  • A change in pressure at any point in a fluid is
    transmitted equally and unchanged in all
    directions throughout the fluid

7
hydraulics
  • Uses Pascals principle and moving pistons with
    an enclosed pressurized fluid
  • Examples
  • Car brakes, jacks, and loaders

8
Problem
  • If a force of 30 N is placed on a small piston of
    a hydraulic device with an area of 2 cm2, what
    size of a load can the larger piston lift if the
    area of the larger piston is 80 cm2?

9
Bernoullis principle
  • Swiss scientist
  • 1700-1782
  • Explained the basis behind airplane flight.
  • As the speed of a fluid increase, the pressure
    decreases

10
Airplane forces
11
Why is wing shaped the way it is?
12
Other applications of Bernoullis principle
13
buoyancy
  • The ability of a fluid to exert an upward force
    on an object resulting in an APPARENT loss of
    weight of the object

14
Archimedes
  • Greek mathematician
  • 287-212 B.C.
  • Best known for his theory that the buoyant force
    on an object is equal to the weight of the fluid
    displaced

15
Application of buoyancy
  • Ballast tanks in submarines

16
submarine fish
17
Assignment
  • Pages 407-408
  • 1-10, 12, 15, 17, 20, 26, 27
  • Page 409
  • 1-6
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