Table of Contents Chapter Preview 11.1 Pressure

Slides:



Advertisements
Similar presentations
Forces in Fluids p
Advertisements

Chapter 13 Fluid Pressure.
Chapter 12 Forces & Fluids.
Chapter 3: Forces & Fluids Review. How can you change the pressure on the ground when you are standing?  Stand on one foot (decrease area)  Change into.
Forces in Fluids Ch. 11.
Chapter Preview Questions
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Buoyant Force Buoyant force is the upward force exerted on an object.
11-1/11-2: Pressure and Floating & Sinking
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?
The tendency or ability of an object to float.
Chapter 11 – Forces in Fluids
Pressure Pressure is equal to the force applied to a surface, divided by the area.
Table of Contents Pressure Floating and Sinking Pascal’s Principle
Chapter 13 Forces in Fluids.
The tendency or ability of an object to float.
Pressure in Fluid Systems
Forces in Fluids Chapter 11.
Physical Science Unit: Forces in Fluids.
Why is the electricity produced at the bottom of dams? When you catch a deep-sea fish, why does its eyes pop- out? Why do your ears pop on an airplane.
Any substance that can change shape or flow easily.
Fluid Mechanics Chapter 8.
Good Day! 10/7/2015 How is it that you can stop a huge car by just pushing on a pedal? It seems like you would need more force than that doesn’t it? The.
Table of Contents Pressure Floating and Sinking Pascal’s Principle
Forces and Fluids.
11-3/11-4: Pascal’s & Bernoulli’s Principles
Motion and Energy, Forces, Forces and Fluids. Motion and Speed.
Chapter 11 Notes Forces in Fluids.
Table of Contents Pressure Floating and Sinking Pascal’s Principle
8th- Chapter 11 Review Game
Fluid Forces Mrs. Clarici
12-4 Notes Pressure and Fluids. Fluids can exert an upward force on objects.
Section 2.  How can a huge ship float? Because the force pushing up on the ship opposes the weight of the ship pushing down  Supporting force is called.
- Pressure 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.
Floating and Sinking.  Density is a measure of how closely packed the atoms in a substance are  Density is a physical property  All matter has measurable.
Forces and Fluids.
Unit 3: Motion, Forces, & Energy Chapter 11: Motion & Energy Big Idea: If an object is less dense than a fluid, it will float in the fluid. If an object.
Properties of Fluids Mr Carter Science. How do ships float? The answer is buoyancy.
Chapter 10.4 Learning Goals
Choose a category. You will be given the answer. You must give the correct question. Click to begin.
Forces in Fluids Chapter 11 State Standard: Unbalanced forces cause changes in velocity. All objects experience a buoyant force when immersed in a fluid.
Forces in Fluids Chapter 13. Fluid Pressure  Section 13-1.
Forces in Fluids Section 6-1 Pressure. Forces in Fluids What is pressure?  A force pushing on a surface How do force and pressure differ?  Your downward.
Chapter 7 Forces in Fluids.
Forces and Fluids Chapter 12 BIG IDEAS Newton’s laws apply to all forces Gravity is a force exerted by all masses Friction is a force that opposes motion.
Pressure – The result of force distributed over an area – Pressure = Force(in Newton's – N)/area (m 2 ) Pascal (Pa) – SI unit for Pressure – Named after.
Notes 11-3 and 11-4 Pascal’s and Bernoulli’s Principles.
PRESSURE & BUOYANCY Ch 11. I. PRESSURE A.The force exerted on a surface divided by the area over which the force is exerted. B.Pressure = Force = Newton’s.
Forces in Fluids PressureBouyancy Pascal’s Principle Bernoulli’s Principle.
Chapter 11 – Forces in Fluids. Pressure The amount of pressure you exert depends on the area over which you exert force. Pressure is equal to the force.
Fluid Pressure Chapter 13 Section 1 Page 390. Fluid Pressure Chapter 13 Section 1 Pg
FORCES IN FLUIDS CHAPTER 11. Section 11-1 Pressure Pressure - related to the word press - refers to the force pushing on a surface.
Forces in Fluids Pressure Floating and Sinking Pascal’s Principle Bernoulli’s Principle Table of Contents.
Section 3: Pascal’s Principle What does Pascal’s principle say about change in fluid pressure? How does a hydraulic system work?
Chapter 12: Forces and Fluids
Floating and Sinking.
Fluids Objectives: Pressure inside fluids Hydraulic Lift
Density and Buoyancy Chapter 11.2 Page 424.
Forces in Fluids.
Force In Fluids Chapter 11
When you catch a deep-sea fish, why does its eyes pop-out?
Warm – Up Chapter How do particle change from a solid to a liquid? 2. What is the difference between evaporation and boiling? 3. What is sublimation?
Section 3: Fluids Preview Key Ideas Bellringer Pressure Buoyant Force
Floating and Sinking.
Properties of Fluids.
Physical Science Forces in Fluids.
Forces in Fluids Chapter 11 Notes.
FORCES IN FLUIDS CHAPTER 11.
Bernoulli’s, Pascal’s, & Archimedes’ Principles
Warm-up Page 83, 1. All fluids exert a __________. pressure Page 83, 2. The equation for pressure is: Pressure = force/area Page 83, 3. The SI unit for.
Properties of Fluids.
Presentation transcript:

Table of Contents Chapter Preview 11.1 Pressure 11.2 Floating and Sinking 11.3 Pascal’s Principle 11.4 Bernoulli’s Principle

Chapter Preview Questions 1. Which of the following is an example of a force? a. water b. other fluids c. gravity d. mass

Chapter Preview Questions 1. Which of the following is an example of a force? a. water b. other fluids c. gravity d. mass

Chapter Preview Questions 2. A fluid can be a. a gas only. b. a liquid only. c. a solid or a gas. d. a liquid or a gas.

Chapter Preview Questions 2. A fluid can be a. a gas only. b. a liquid only. c. a solid or a gas. d. a liquid or a gas.

Chapter Preview Questions 3. The velocity of an object is a. its standard reference point. b. the rate of change of its position. c. the process of speeding it up. d. its change in direction.

Chapter Preview Questions 3. The velocity of an object is a. its standard reference point. b. the rate of change of its position. c. the process of speeding it up. d. its change in direction.

Chapter Preview Questions 4. Earth’s gravity pulls you down with a force a. greater than your weight. b. the size of your feet. c. equal to your weight. d. half your weight.

Chapter Preview Questions 4. Earth’s gravity pulls you down with a force a. greater than your weight. b. the size of your feet. c. equal to your weight. d. half your weight.

How can you predict if an object will sink or float in a fluid? You dive into a pool wearing a life vest. Wearing the vest makes you bigger and makes you weigh more. So why do you float?

Identify Multiple Meanings 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 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 force when you open and close a door.

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.

Apply It! Read the sentences below. Then identify the term that has a scientific 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.

End of Chapter Preview

Section 1: Pressure What does pressure depend on? How do fluids exert pressure? How does fluid pressure change with elevation and depth?

What Is Pressure? The amount of pressure you exert depends on the area over which you exert a force.

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.

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

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

Variations in Fluid Pressure As your elevation increases, atmospheric pressure decreases.

Variations in Fluid Pressure Water pressure increases as depth increases.

Links on Fluids and Pressure Click the SciLinks button for links on fluids and pressure.

End of Section: Pressure

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?

Calculating Density The density of a substance is its mass per unit of volume. For example, a sample of liquid has a mass of 24 g and a volume of 16 mL. What is its density?

Calculating Density Practice Problem A piece of metal has a mass of 43.5 g and a volume of 15 cm3. What is its density? 2.9 g/cm3  

Density Changes in density cause a submarine to dive, rise, or float.

Density Changes in density cause a submarine to dive, rise, or float.

Density Changes in density cause a submarine to dive, rise, or float.

Buoyancy The 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.

Buoyancy The buoyant force works opposite the weight of an object.

Buoyancy Archimedes’ principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.

Buoyancy A solid block of steel sinks in water. A steel ship with the same weight floats on the surface.

Click the Video button to watch a movie about density.

End of Section: Floating and Sinking

Section 3: Pascal’s Principle What does Pascal’s principle say about change in fluid pressure? How does a hydraulic system work?

Transmitting Pressure in a Fluid When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.

Hydraulic Devices In a hydraulic device, a force applied to one piston increases the fluid pressure equally throughout the fluid.

Hydraulic Devices By changing the size of the pistons, the force can be multiplied.

Hydraulic Systems Activity Click the Active Art button to open a browser window and access Active Art about hydraulic systems.

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.

Comparing Hydraulic Lifts Reading 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

Comparing Hydraulic Lifts Reading Graphs: For Lift A, how much force must be applied to lift a 12,000-N object? 3,000 N

Comparing Hydraulic Lifts Interpreting Data: By how much is the applied force multiplied for Lift A? Lift B? Lift A: applied force is multiplied by four; lift B: applied force is multiplied by two.

Comparing Hydraulic Lifts Interpreting Data: What does the slope of each line represent? The slope gives the ratio of the lifting force to the applied force. The greater the slope, the more the lift multiplies force.

Comparing Hydraulic Lifts Drawing 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.

Hydraulic Brakes The hydraulic brake system of a car multiplies the force exerted on the brake pedal.

End of Section: Pascal’s Principle

Section 4: Bernoulli’s Principle How is fluid pressure related to the motion of a fluid? What are some applications of Bernoulli’s principle?

Bernoulli’s Principle Bernoulli’s principle states that as the speed of a moving fluid increases, the pressure exerted by the fluid decreases.

Applying Bernoulli’s Principle Bernoulli’s principle helps explain how planes fly.

Applying Bernoulli’s Principle An atomizer is an application of Bernoulli’s principle.

Applying Bernoulli’s Principle Thanks in part to Bernoulli's principle, you can enjoy an evening by a warm fireplace without the room filling up with smoke.

Applying Bernoulli’s Principle Like an airplane wing, a flying disk uses a curved upper surface to create lift.

Links on Bernoulli’s Principle Click the SciLinks button for links on Bernoulli’s principle.

End of Section: Bernoulli’s Principle

QuickTake Quiz Click to start quiz.