Chapter 11 notes
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Chapter 11 Notes. Forces in Fluids. Section 1 - Pressure. Pressure decreases as the area over which a force is distributed increases. increase surface area, decrease pressure ice skates

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Chapter 11 Notes

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Chapter 11 notes

Chapter 11 Notes

Forces in Fluids


Section 1 pressure

Section 1 - Pressure

  • Pressure decreases as the area over which a force is distributed increases.

  • increase surface area, decrease pressure

  • ice skates

  • 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

  • 1 Pa = 1N/m2

Chapter 11


Pressure cont d

Pressure cont’d

  • fluid - substance which can easily flow

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

  • Balanced pressure - air pressure

  • as elevation increases, air pressure decreases

  • water pressure increases as depth increases

Chapter 11


Section 2 floating and sinking

Section 2 - 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. 383

Chapter 11


Floating sinking cont d

Floating & Sinking cont’d.

  • density = mass/volume units g/mL or g/cm3

  • water density = 1 g/mL pg.363

  • By comparing densities, you can predict whether an object will float or sink in a fluid.

Chapter 11


Section 3 pascal s principle

Section 3 – Pascal’s Principle

  • Pascal’s principle - When force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid.

  • Page 390 - Demonstration

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 4 bernoulli s principle

Section 4 - Bernoulli’s Principle

  • Wright brothers

  • Fluid naturally flows from an area of hogh pressure to an area of low pressure.

Chapter 11


Bernoulli s principle

Bernoulli’s principle

  • As the speed of a moving fluid increases, the pressure within the fluid decreases.

    • Air moves at different speeds above and below objects.

    • Difference in pressure causes lift or downward force

  • wings pg. 395

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


Bernoulli s principle cont d

Bernoulli’s Principle cont’d.

  • Bernoulli’s principle helps explain how planes fly. It also helps explain why smoke rises up a chimney, how an atomizer works, and how a flying disk glides through the air.

Chapter 11


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