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Chapter 11 Notes . Section 1 - Pressure. Pressure - equal to the force exerted on a surface divided by the total area over which the force is exerted. Pressure = force/area pressure units = pascal increase surface area, decrease pressure ice skates

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section 1 pressure
Section 1 - Pressure
  • Pressure - equal to the force exerted on a surface divided by the total area over which the force is exerted.
  • Pressure = force/area
  • pressure units = pascal
  • increase surface area, decrease pressure
  • ice skates
  • fluid - substance which can easily flow

Chapter 11

slide3
All of the forces exerted by the individual molecules in a fluid add together to make up the pressure exerted by the fluid.
  • Balanced pressure - air pressure
  • pressure at a given level in a fluid is the same in all directions
  • air pressure decreases as elevation increases
  • water pressure increases as depth increases

Chapter 11

section 2 transmitting pressure in a fluid
Section 2 - Transmitting Pressure in a Fluid
  • Pascal’s principle - When force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid.

Chapter 11

hydraulic system
Hydraulic System
  • Multiplies a force by applying the force to a small surface area.
  • The increase in pressure is then transmitted to another part of the confined fluid, which pushes on a larger surface area.
    • Small force over small area results in a larger force exerted by a larger area at another place.
      • Car brakes, repair shop lift, fire truck ladder

Chapter 11

section 3 floating and sinking
Section 3 - Floating and Sinking
  • Buoyant force - acts in an upward direction, against the force of gravity.
    • Makes an object feel lighter
  • Archimedes’ principle - the buoyant force on an object is equal to the weight of the fluid displaced by the object
  • floating and sinking - pg. 362

Chapter 11

slide7
density = mass/volume units g/mL or g/cm3
  • water density = 1 g/mL pg.363

Chapter 11

bernoulli s principle
Bernoulli’s principle
  • The pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid.
    • Air moves at different speeds above and below objects.
    • Difference in pressure causes lift or downward force
  • wings pg. 367

Chapter 11

chapter 11 vocabulary list
Chapter 11 - Vocabulary List
  • Pressure
  • Pascal’s principle
  • hydraulic system
  • buoyant force
  • Archimedes’ principle
  • Bernoulli’s principle

Chapter 11

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