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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

• 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

• 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

• 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

• 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

• 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

• Wright brothers

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

Chapter 11

• 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

• Pressure

• Pascal’s principle

• hydraulic system

• buoyant force

• Archimedes’ principle

• Bernoulli’s principle

Chapter 11

• 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