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Chapter 11 Forces in Fluids
Table of ContentsChapter Preview
11.1 Pressure
11.2 Floating and Sinking
11.3 Pascal’s Principle
11.4 Bernoulli’s Principle
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Chapter 11 Forces in Fluids
Chapter Preview Questions
1. Which of the following is an example of a force?a. waterb. other fluidsc. gravityd. mass
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Chapter 11 Forces in Fluids
Chapter Preview Questions
1. Which of the following is an example of a force?a. waterb. other fluidsc. gravityd. mass
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Chapter 11 Forces in Fluids
Chapter Preview Questions
2. A fluid can bea. a gas only.b. a liquid only.c. a solid or a gas.d. a liquid or a gas.
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Chapter 11 Forces in Fluids
Chapter Preview Questions
2. A fluid can bea. a gas only.b. a liquid only.c. a solid or a gas.d. a liquid or a gas.
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Chapter 11 Forces in Fluids
Chapter Preview Questions
3. The velocity of an object isa. its standard reference point.b. the rate of change of its position.c. the process of speeding it up.d. its change in direction.
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Chapter 11 Forces in Fluids
Chapter Preview Questions
3. The velocity of an object isa. its standard reference point.b. the rate of change of its position.c. the process of speeding it up.d. its change in direction.
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Chapter 11 Forces in Fluids
Chapter Preview Questions
4. Earth’s gravity pulls you down with a forcea. greater than your weight.b. the size of your feet.c. equal to your weight.d. half your weight.
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Chapter 11 Forces in Fluids
Chapter Preview Questions
4. Earth’s gravity pulls you down with a forcea. greater than your weight.b. the size of your feet.c. equal to your weight.d. half your weight.
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Chapter 11 Forces in Fluids
You dive into a pool wearing a lifevest. Wearing the vest makes youbigger and makes you weighmore. So why do you float?
How can you predict if an object will sink or floatin a fluid?
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Chapter 11 Forces in Fluids
Word Everyday Meaning Scientific Meaning
fluid
n. A liquid
Example: It’s good for your health to drink plenty of fluids every day.
n. A substance that can easily flow; a gas or a liquid
Example: Like water, air is a fluid.
Identify Multiple Meanings
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Chapter 11 Forces in Fluids
Word Everyday Meaning Scientific Meaning
force
v. To use power to make someone do something
Example: She had to force herself to get up early.
n. A push or a pull exerted on an object
Example: You exert forcewhen you open and close a door.
Identify Multiple Meanings
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Chapter 11 Forces in Fluids
Identify Multiple Meanings
Word Everyday Meaning Scientific Meaning
pressure
n. A feeling of being pushed to do things
Example: Students may feel pressure from adults to do well on tests.
n. The force exerted on a surface divided by the total area over which the force is exerted
Example: When air leaks from a tire, the pressure is reduced and the tire becomes soft.
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Chapter 11 Forces in Fluids
Apply It!
Read the sentences below. Then identify the term that has ascientific meaning.
1. When a gas is heated, the pressure of the gas increases.
2. Her parents are putting pressure on her to find a job.
Sample: The first sentence deals with gas, which is a science topic. The second sentence is about a girl and her parents. The first is clearly giving “pressure” a scientific meaning.
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Chapter 11 Forces in Fluids
End of Chapter Preview
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Chapter 11 Forces in Fluids
Section 1:Pressure
What does pressure depend on?How do fluids exert pressure?How does fluid pressure change with elevation and depth?
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Chapter 11 Forces in Fluids
What Is Pressure?The amount of pressure you exert depends on the area over which you exert a force.
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Chapter 11 Forces in Fluids
Area The area of a surface is the number of square units that it covers. To find the area of a rectangle, multiply its length by its width. The area of the rectangle below is 2 cm X 3 cm, or 6 cm2.
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Chapter 11 Forces in Fluids
Area
Practice Problem
Which has a greater area: a rectangle that is 4 cm X 20 cm or a square that is 10 cm X 10 cm?
The square has the greater area.4 cm X 20 cm = 80 cm2
10 cm X 10 cm = 100 cm2
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Chapter 11 Forces in Fluids
Fluid PressureAll of the forces exerted by the individual particles in a fluidcombine to make up the pressure exerted by the fluid.
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Chapter 11 Forces in Fluids
Variations in Fluid PressureAs your elevation increases, atmospheric pressure decreases.
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Chapter 11 Forces in Fluids
Variations in Fluid PressureWater pressure increases as depth increases.
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Chapter 11 Forces in Fluids
Links on Fluids and Pressure
Click the SciLinks button for links on fluids and pressure.
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Chapter 11 Forces in Fluids
End of Section:Pressure
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Chapter 11 Forces in Fluids
Section 2:Floating and Sinking
How can you predict whether an object will float or sink in a fluid?What is the effect of the buoyant force?
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Chapter 11 Forces in Fluids
The density of a substance is its mass per unit of volume.
For example, a sample of liquid has a mass of 24 g anda volume of 16 mL. What is its density?
Calculating Density
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Chapter 11 Forces in Fluids
Calculating Density
2.9 g/cm3
A piece of metal has a mass of 43.5 g and a volumeof 15 cm3. What is its density?
Practice Problem
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Chapter 11 Forces in Fluids
DensityChanges in density cause a submarine to dive, rise, or float.
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Chapter 11 Forces in Fluids
DensityChanges in density cause a submarine to dive, rise, or float.
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Chapter 11 Forces in Fluids
DensityChanges in density cause a submarine to dive, rise, or float.
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Chapter 11 Forces in Fluids
BuoyancyThe pressure on the bottom of a submerged object is greater than the pressure on the top. The result is a net force in the upward direction.
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Chapter 11 Forces in Fluids
BuoyancyThe buoyant force works opposite the weight of an object.
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Chapter 11 Forces in Fluids
Buoyancy
Archimedes’ principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.
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Chapter 11 Forces in Fluids
BuoyancyA solid block of steel sinks in water. A steel ship with the same weight floats on the surface.
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Chapter 11 Forces in Fluids
Density
Click the Video button to watch a movie about density.
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Chapter 11 Forces in Fluids
End of Section:Floating and Sinking
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Chapter 11 Forces in Fluids
Section 3:Pascal’s Principle
What does Pascal’s principle say about change in fluid pressure?How does a hydraulic system work?
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Chapter 11 Forces in Fluids
Transmitting Pressure in a FluidWhen force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.
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Chapter 11 Forces in Fluids
Hydraulic DevicesIn a hydraulic device, a force applied to one piston increases the fluid pressure equally throughout the fluid.
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Chapter 11 Forces in Fluids
Hydraulic DevicesBy changing the size of the pistons, the force can be multiplied.
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Chapter 11 Forces in Fluids
Hydraulic Systems Activity
Click the Active Art button to open a browser window and access Active Art about hydraulic systems.
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Chapter 11 Forces in Fluids
Comparing Hydraulic Lifts
In a hydraulic device, a force applied to the piston on the left produces a lifting force in the piston on the right. The graph shows the relationship between the applied force and the lifting force for two hydraulic lifts.
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Chapter 11 Forces in Fluids
Comparing Hydraulic LiftsReading Graphs:
Suppose a force of 1,000 N is applied to both lifts. Use the graph to determine the lifting force of each lift.
Lift A: 4,000 N; lift B: 2,000 N
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Chapter 11 Forces in Fluids
Comparing Hydraulic LiftsReading Graphs:
For Lift A, how much force must be applied to lift a 12,000-N object?
3,000 N
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Chapter 11 Forces in Fluids
Comparing Hydraulic Lifts
Lift A: applied force is multiplied by four; lift B: applied force is multiplied by two.
Interpreting Data:
By how much is the applied force multiplied for Lift A? Lift B?
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Chapter 11 Forces in Fluids
Comparing Hydraulic Lifts
The slope gives the ratio of the lifting force to the applied force. The greater the slope, the more the lift multiplies force.
Interpreting Data:
What does the slope of each line represent?
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Chapter 11 Forces in Fluids
Comparing Hydraulic LiftsDrawing Conclusions:
Which lift would you choose if you wanted to lift a weight of 4,000 N? Explain.
Lift A, because it multiplies force more than lift B.
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Chapter 11 Forces in Fluids
Hydraulic BrakesThe hydraulic brake system of a car multiplies the force exerted on the brake pedal.
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Chapter 11 Forces in Fluids
End of Section:Pascal’s Principle
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Chapter 11 Forces in Fluids
Section 4:Bernoulli’s PrincipleHow is fluid pressure related to the motion of a fluid?What are some applications of Bernoulli’s principle?
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Chapter 11 Forces in Fluids
Bernoulli’s PrincipleBernoulli’s principle states that as the speed of a moving fluid increases, the pressure exerted by the fluid decreases.
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Chapter 11 Forces in Fluids
Applying Bernoulli’s PrincipleBernoulli’s principle helps explain how planes fly.
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Chapter 11 Forces in Fluids
Applying Bernoulli’s PrincipleAn atomizer is an application of Bernoulli’s principle.
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Chapter 11 Forces in Fluids
Applying Bernoulli’s PrincipleThanks in part to Bernoulli's principle, you can enjoy an evening by a warm fireplace without the room filling up with smoke.
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Chapter 11 Forces in Fluids
Applying Bernoulli’s PrincipleLike an airplane wing, a flying disk uses a curved upper surface to create lift.
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Chapter 11 Forces in Fluids
Links on Bernoulli’s Principle
Click the SciLinks button for links on Bernoulli’s principle.
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Chapter 11 Forces in Fluids
End of Section:Bernoulli’s Principle
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Chapter 11 Forces in Fluids
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