Chapter 11 Notes

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# Chapter 11 Notes - PowerPoint PPT Presentation

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

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

Chapter 11

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
• Pressure
• Pascal’s principle
• hydraulic system
• buoyant force
• Archimedes’ principle
• Bernoulli’s principle

Chapter 11

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