Section 2 Buoyancy and Density

Save this PDF as:

Size: px
Start display at page:

Transcription

1 Section 2 Buoyancy and Density Key Concept Buoyant force and density affect whether an object will float or sink in a fluid. What You Will Learn All fluids exert an upward buoyant force on objects in the fluid. The buoyant force on an object is equal to the weight of the fluid displaced by the object. An object will float or sink depending on the relationship between the object s weight, buoyant force, and overall density. Density can be calculated from measurements of mass and volume. The overall density of an object can be changed by changing the object s shape, mass, or volume. Why It Matters Understanding buoyant force and density will help you predict whether an object will float or sink in a fluid. Why does ice float on water? Why doesn t it sink? Imagine that you use a straw to push an ice cube underwater. Then, you remove the straw. A force pushes the ice up to the water s surface. The force, called buoyant force, is the upward force that fluids exert on all matter. Buoyant Force and Fluid Pressure Look at Figure 1. Water exerts fluid pressure on all sides of an object. The pressure that is applied horizontally on one side of the object is equal to the pressure applied on the other side. These equal pressures balance one another. So, the only fluid pressures that may change the net force on the object are at the top and at the bottom. Pressure increases as depth increases. So, the pressure at the bottom of the object is greater than the pressure at the top. This difference in pressure is shown by the different lengths of the arrows in Figure 1. The water applies a net upward force on the object. This upward force, which is caused by differences in pressure, is buoyant force.

2 Figure 1 There is more pressure at the bottom of an object because pressure increases with depth. This difference in pressure results in an upward buoyant force on the object. Why is the pressure at the bottom of an object in a fluid greater than the pressure at the top of the object? Determining Buoyant Force Archimedes (AHR kuh MEE DEEZ) was a Greek mathematician who lived in the third century BCE. He discovered how to find buoyant force. Archimedes principle states that the buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object takes the place of, or displaces. Suppose the block in Figure 2 displaces 250 ml of water. The weight of 250 ml of water is about 2.5 N. The weight of the displaced water is equal to the buoyant force acting on the block. So, the buoyant force on the block is 2.5 N. Notice that you need to know only the weight of

3 the water that is displaced to find the buoyant force. You do not need to know the weight of the block. But in order to predict if an object will float or sink, you need to consider the weights of both the displaced water and the object. Figure 2 As a block is lowered into a container of water, the block displaces a certain volume of water. Then, this same volume of water flows into a smaller container. What does the weight of displaced water in the smaller container represent? Explain how displacement is used to determine buoyant force. Weight Versus Buoyant Force An object in a fluid will sink if the object s weight is greater than the buoyant force (the weight of the fluid that the object displaces). An object floats only when the buoyant force on the object is equal to the object s weight. Sinking The rock in Figure 3 weighs 75 N. It displaces 5 L of water. Archimedes principle states that the buoyant force is equal to the weight of the displaced water about 50 N. The rock s weight is greater than the buoyant force. So, the rock sinks.

4 Figure 3 Will an object sink or float? The answer depends on the amount of buoyant force in relation to the object s weight. Floating The fish in Figure 3 weighs 12 N. It displaces a volume of water that weighs 12 N. Because the fish s weight is equal to the buoyant force, the fish floats in the water. In fact, the fish is suspended in the water as it floats. Now, look at the duck. The duck weighs 9 N. The duck floats. So, the buoyant force on the duck must equal 9 N. But only part of the duck has to be below the surface to displace 9 N of water. So, the duck floats on the surface of the water. Buoying Up If it dives underwater, the duck will displace more than 9 N of water. So, the buoyant force on the duck will be greater than the duck s weight. When the buoyant force on the duck is greater than the duck s weight, the duck is buoyed up (pushed rup). An object is buoyed up until the part of the object underwater displaces an amount of water that equals the object s entire weight. Thus, an ice cube pops to the surface when it is pushed to the bottom of a glass of water. What causes an object to buoy up?

5 Density and Floating Think again about the rock in the lake. The rock displaces 5 L of water. But volumes of solids are measured in cubic centimeters (cm 3 ). Because 1 ml is equal to 1 cm 3, the volume of the rock is 5,000 cm 3. But 5,000 cm 3 of rock weighs more than an equal volume of water. So, the rock sinks. Because mass is proportional to weight, you can say that the rock has more mass per volume than water has. Mass per unit volume is density. The rock sinks because it is denser than water. The duck floats because it is less dense than water is. The density of the fish is equal to the density of the water. Explain why volume and mass affect whether an object will sink or float in water. More Dense Than Air Why does an ice cube float on water but not in air? An ice cube floats on water because ice is less dense than water. But most substances are more dense than air. So, there are few substances that float in air. An ice cube is more dense than air, so ice doesn t float in air. Less Dense Than Air One substance that is less dense than air is helium, a gas. In fact, helium has one-seventh the density of air under normal conditions. So, helium floats in air. Because it floats in air, helium is used in parade balloons, such as the one shown in Figure 4.

6 Figure 4 Helium in a balloon floats in air for the same reason that an ice cube floats on water: the helium is less dense than the surrounding fluid. Determining Density To determine the density of an object, you need to know the object s mass and volume. You can use a balance to measure the mass of an object. But finding the volume of the object takes a little more work. Volume of a Regular Solid Some solids, such as cubes or rectangular blocks, have regular shapes. To find the volume of one of these objects, use a ruler to

7 measure the length of each side. Then, multiply the three lengths together to find the volume of the object. Volume of an Irregular Solid Many things do not have a regular shape. So, you cannot easily calculate the volume of these objects. Instead, you can find the volume through water displacement. By measuring the volume of water that the object pushes aside, you find the volume of the object itself. Compare the methods for finding the volume of a regular solid and the volume of an irregular solid. Changing Overall Density Steel is almost 8 times denser than water. Yet huge steel ships cruise the oceans with ease. But hold on! You just learned that substances that are denser than water will sink in water. So, how does a steel ship float? Changing the Shape The secret of how a ship floats is in the shape of the ship, as shown in Figure 5. What if a ship were just a big block of steel? If you put that block into water, the block would sink because it is denser than water. So, ships are built with a hollow shape. Imagine that the amount of steel in the ship is equal to the amount in the block. The hollow shape increases the volume of the ship. Remember that density is mass per unit volume. As volume increases, density decreases if the mass stays the same. So, an increase in the ship s volume leads to a decrease in the ship s density. Thus, ships made of steel float because their overall density is less than the density of water.

8 Figure 5 A block of steel is denser than water, so the block sinks. But shaping that block of steel into a hollow form results in less overall density. So, the ship floats. Most ships are built to displace more water than is necessary for the ships to float. Ships are made this way so that they will not sink when people and cargo are loaded on the ships. Changing the Mass A submarine is a special kind of ship that can travel both on the surface of the water and underwater. Submarines have ballast tanks that can be opened to allow sea water to flow in. As water is added, the submarine s mass increases, but its volume stays the same. The submarine s overall density increases so that it can dive under the surface. Crew members control the amount of water taken in. In this way, they control how dense the submarine is and how deep it dives. Compressed air is used to blow the water out of the tanks so that the submarine can rise. Study Figure 6 to learn how ballast tanks work.

9 Figure 6 Controlling Density Using Ballast Tanks Changing the Volume Like a submarine, some fish adjust their overall density to stay at a certain depth in the water. Most bony fishes have an organ called a swim bladder, shown in Figure 7. This swim bladder is filled with gases that are produced in a fish s blood. The inflated swim bladder increases the fish s volume, which decreases the fish s overall density. Thus, the fish does not sink in the water. The fish s nervous system controls the amount of gas in the bladder. Some fish, such as sharks, do not have a swim bladder. These fish must swim constantly to keep from sinking. Figure 7 Most bony fishes have an organ called a swim bladder that allows them to adjust their overall density. How does a swim bladder enable a fish to float?

10 Section Summary All fluids exert an upward force called buoyant force. Buoyant force is caused by differences in fluid pressure. Archimedes principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object. Any object that is denser than the surrounding fluid will sink. An object that is less dense than the surrounding fluid will float. The overall density of an object can be changed by changing the object s shape, mass, or volume. Chapter Summary D The Big Idea Forces in fluids are related to pressure and density and can affect the motion of objects in the fluid. Section 1 Fluids and Pressure Key Concept Fluid is a nonsolid state of matter. All fluids can flow and exert pressure evenly in all directions.

11 Pressure is the amount of force exerted on a given area. Fluid pressure increases as depth increases. Density is mass per unit volume. Because water is denser than air, water exerts more pressure than air does. Fluids flow from areas of high pressure to areas of low pressure. Section 2 Buoyancy and Density Key Concept Buoyant force and density affect whether an object will float or sink in a fluid. All fluids exert an upward buoyant force on objects in the fluid. The buoyant force on an object is equal to the weight of the fluid displaced by the object. An object will float or sink depending on the relationship between the object s weight, buoyant force, and overall density. Density can be calculated from measurements of mass and volume. The overall density of an object can be changed by changing the object s shape, mass, or volume.

12

Forces in Fluids. Objectives Describe how fluids exert pressure. Explain the relationship between fluid pressure and buoyant force.

Forces in Fluids Objectives Describe how fluids exert pressure. Explain the relationship between fluid pressure and buoyant force. Describe the relationship between pressure and fluid speed. I. Fluids

13.3 Buoyancy. Buoyant Force

The forces from pressure acting on the bottom of this golf ball are greater than those on the top. This produces a net force called the buoyant force that acts upward on the ball. Buoyant Force What is

17.3 Buoyancy of Fluids

Have you ever noticed how easy it is to do a push-up to lift yourself up and out of a swimming pool? It s much easier than doing push-ups on land. That s because the water is exerting an upward force on

Fluids and Forces FYI

Objectives Fluids and Forces Describe how fluids exert pressure. Analyze how atmospheric pressure varies with depth. Explain how depth and density affect water pressure. Give examples of fluids flowing

Density. Density is how concentrated or compact matter is.

Density Density is how concentrated or compact matter is. Packing snow into snowballs increases its density. You are squeezing large amounts of matter into small volumes of space. Equation for Density

Grade 8 Science Chapter 9 Notes

Grade 8 Science Chapter 9 Notes Force Force - Anything that causes a change in the motion of an object. - usually a push or a pull. - the unit for force is the Newton (N). Balanced Forces - forces that

Write True or False in the space provided.

CP Physics -- Exam #7 Practice Name: _ Class: Date: Write True or False in the space provided. 1) Pressure at the bottom of a lake depends on the weight density of the lake water and on the volume of the

Density. Part 1: What is Density?

Density Part 1: What is Density? Starter Activity Which is heavier, steel or wood? Density We can use a number to describe how heavy something is for its size. Density is the mass per unit of volume. To

Buoyancy is the tendency for materials to rise or float in a fluid The buoyant force is the force exerted on objects that are placed in a fluid in

Buoyancy is the tendency for materials to rise or float in a fluid The buoyant force is the force exerted on objects that are placed in a fluid in the opposite direction of gravity The Anti-Gravity Force

2 Floating and Sinking

Section 2 Floating and Sinking 2 Floating and Sinking Objectives After this lesson, students will be able to M.3.2.1 Describe the effect of the buoyant force. M.3.2.2 Explain how the density of an object

Buoyancy and Archimedes Principle. Buoyancy and Archimedes Principle Assume block is in equilibrium.

Assume block is in equilibrium. Then upward forces must equal downward forces. Upward force: pressure from fluid Downward force: atmospheric pressure plus weight Therefore In this case, the object is less

Name Class Date. F 2 2269 N A 1 88.12 cm 2 A 2 1221 cm 2 Unknown: Step 2: Write the equations for Pascal s principle and pressure, force, and area.

Skills Worksheet Math Skills Pascal s Principle After you study each sample problem and solution, work out the practice problems on a separate sheet of paper. Write your answers in the spaces provided.

Fluids I. Level : Conceptual Physics/Physics I. Q1) Order the following materials from lowest to greatest according to their densities.

Fluids I Level : Conceptual Physics/Physics I Teacher : Kim 1. Density One of the properties of any substances (solids, liquids and gases) is the measure of how tightly the material is packed together.

Archimedes Principle. Biological Systems

Archimedes Principle Introduction Many of the substances we encounter in our every day lives do not have rigid structure or form. Such substances are called fluids and can be divided into two categories:

Fluids Quiz Science 8

Fluids Quiz Science 8 Introduction to Fluids 1. What are fluids essential for? Industrial Processes 2. What devices use knowledge of fluids? Hydraulic and pneumatic devices and machines A Close-Up Look

Lecture 13 Mass Density (Chapter 12) Pressure Buoyant Force

Lecture 13 Mass Density (Chapter 12) Pressure Buoyant Force (Chap. 13) Density The (mass) density of a material is its mass M per unit volume V: The densities of most liquids and solids vary slightly with

Physics 181- Summer 2011 - Experiment #8 1 Experiment #8, Measurement of Density and Archimedes' Principle

Physics 181- Summer 2011 - Experiment #8 1 Experiment #8, Measurement of Density and Archimedes' Principle 1 Purpose 1. To determine the density of a fluid, such as water, by measurement of its mass when

FOIL BOATS. DESIGN CHALLENGE Design and build a boat from aluminum foil that can hold as many pennies as possible before sinking or capsizing.

Grades 3 5 20 minutes FOIL BOATS DESIGN CHALLENGE Design and build a boat from aluminum foil that can hold as many pennies as possible before sinking or capsizing. MATERIALS Supplies and Equipment: Shallow

Fluids I. Density is a measure of how much matter is squeezed into a given space, that is, the amount of mass per unit volume.

Fluids I Level : Conceptual Physics Teacher : Kim 1. Density One of the properties of any substances (solids, liquids and gases) is the measure of how tightly the material is packed together. This property

Student Exploration: Archimedes Principle

Name: Date: Student Exploration: Archimedes Principle Vocabulary: Archimedes principle, buoyant force, density, displace, mass, volume, weight Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

Chapter 3. Table of Contents. Chapter 3. Objectives. Chapter 3. Kinetic Theory. Section 1 Matter and Energy. Section 2 Fluids

States of Matter Table of Contents Objectives Summarize the main points of the kinetic theory of matter. Describe how temperature relates to kinetic energy. Describe four common states of matter. List

Chapter 13: LIQUIDS. Lecture Part 1-2. Armen Kocharian Pearson Education, Inc.

Chapter 13: LIQUIDS Lecture Part 1-2 Armen Kocharian Objectives: Pressure Pressure in a Liquid Buoyancy in a Liquid Archimedes Principle What Makes an Object Sink or Float The force per unit area that

DENSITY. reflect. look out! 6.6B

6.6B reflect Imagine that it is a very hot day. You decide to cool a glass of water by placing several ice cubes in the drink. What happens when you drop the ice into the water? Likely, when you place

Kinetic Theory. Bellringer. Kinetic Theory, continued. Visual Concept: Kinetic Molecular Theory. States of Matter, continued.

Bellringer You are already familiar with the most common states of matter: solid, liquid, and gas. For example you can see solid ice and liquid water. You cannot see water vapor, but you can feel it in

Density and Buoyancy

Density and Buoyancy A fluid exerts an upward force on an object that is placed in the fluid. LESSON 1 Density The density of a material is a measure of how much matter is packed into a unit volume of

Archimedes. F b (Buoyant Force) DEMO. Identical Size Boxes Which has larger F B. Which is heavier. styrofoam (1 cm 3 ) steel ( 1 cm 3 )

Fluids Density 1 F b (Buoyant Force) DEMO Archimedes Identical Size Boxes Which has larger F B Which is heavier styrofoam (1 cm 3 ) steel ( 1 cm 3 ) steel ( 1 cm 3 ) styrofoam (1 cm 3 ) 2 Finding the Weight

Educational Innovations

Educational Innovations DEN-350 Steel Sphere Density Kit Target Age Group: 3-5, 6-8 National Standards K-4 Physical Science Properties of objects and materials Density, weight and volume are properties

Lesson 2 The Buoyant Force

Lesson 2 Student Labs and Activities Page Launch Lab 26 Content Vocabulary 27 Lesson Outline 28 MiniLab 30 Content Practice A 31 Content Practice B 32 School to Home 33 Key Concept Builders 34 Enrichment

Clicker Questions Chapter 10

Clicker Questions Chapter 10 2010 Pearson Education, Inc. Essential College Physics Rex/Wolfson Question 10.1 Density If one material has a higher density than another, does this mean that the molecules

Molecules in a Liquid

LIQUIDS Molecules in a Liquid Chemical bonds can break when heated Leaving individual molecules free to roam Liquids: no large-scale structure Molecules roughly confined by a crowd of other molecules Molecules

Fluids: Liquids & Gases

Chapter 7: Fluids Fluids: Liquids & Gases Fluids are substances that are free to flow. Atoms and molecules are free to move. They take the shape of their containers. Cannot withstand or exert shearing

Name Block Date March 2007 Ch. 19 Liquids Notes

Name Block Date March 2007 Ch. 19 Liquids Notes Mrs. Peck Objectives: 1. Describe what determines the pressure of a liquid at any point. 19.1 2. Explain the cause of a buoyant force on an immersed or submerged

Name Date Hour. Buoyancy

Name Date Hour Buoyancy Consider: If I gave you an object that you had never seen before and it was made of unknown material and then asked you whether or not it would float in water, what would you base

Fluids: Liquids vs. Gases

FLUID MECHANICS Fluids: Liquids vs. Gases Chemical bonds can break when heated Leaving individual molecules free to roam randomly Liquids: Volume held constant due to surface tension So density (mass /

Buoyant Force and Archimedes Principle

Buoyant Force and Archimedes Principle Predict the behavior of fluids as a result of properties including viscosity and density Demonstrate why objects sink or float Apply Archimedes Principle by measuring

Chapter 3. Flotation. ELEMENTARY HYDRAULICS National Certificate in Technology (Civil Engineering) Buoyancy

ELEMENTARY HYDRAULICS National Certificate in Technology (Civil Engineering) Chapter 3 Flotation Buoyancy Buoyancy arises from the fact that fluid pressure increases with depth and from the fact that the

Making Things Float & Making a Hydrometer

Making Things Float & Making a Hydrometer Grade 7 Activity Plan 1 Making Things Float Objectives: 1. To demonstrate how density and displacement affect whether things float or sink 2. To illustrate how

Mass, Volume and Density

Mass, Volume and Density An integrated Science and Mathematics Exploration Activity 1 Exploring Volume Materials: Set of 6 jars (labelled A-F) of same size A B C D E F Weighing scales Tape measure Ruler

Fascinating Education Script Fascinating Physics Lessons

Fascinating Education Script Fascinating Physics Lessons Why Things Float Slide 1: The blue column of water Here is a lake. I want you to imagine a blue column of water extending from the bottom of the

Matter and the Universe. Ancient Views. Modern Views. Periodic Table of Elements. Ernest Rutherford

Matter and the Universe Ancient Views Early atomists believed that matter had a smallest indivisible bit, an atom. Aristotle, the most famous of the early Greek philosophers, didn't agree with the idea

Archimedes Principle

Archimedes Principle Bởi: OpenStaxCollege When you rise from lounging in a warm bath, your arms feel strangely heavy. This is because you no longer have the buoyant support of the water. Where does this

Chapter 9: The Behavior of Fluids

Chapter 9: The Behavior of Fluids 1. Archimedes Principle states that A. the pressure in a fluid is directly related to the depth below the surface of the fluid. B. an object immersed in a fluid is buoyed

Applied Fluid Mechanics

Applied Fluid Mechanics 1. The Nature of Fluid and the Study of Fluid Mechanics 2. Viscosity of Fluid 3. Pressure Measurement 4. Forces Due to Static Fluid 6. Flow of Fluid and Bernoulli s Equation 7.

Processes of Science: Physics of Matter. Introduction to Buoyancy

Processes of Science: Physics of Matter Introduction to Buoyancy Introduction: You already know that it's easier to lift something heavy when it's underwater. Why is this? Because the water helps support

Buoyancy Problem Set

Buoyancy Problem Set 1) A stone weighs 105 lb in air. When submerged in water, it weighs 67.0 lb. Find the volume and specific gravity of the stone. (Specific gravity of an object: ratio object density

Simulating Microgravity with Buoyancy A Space School Lesson Plan

ASTRONAUT TRAINING...UNDERWATER Simulating Microgravity with Buoyancy A Space School Lesson Plan by Bill Andrake, Swampscott Middle School Swampscott, Massachusetts Science Lesson: Buoyancy - Based on

The Mystery of the Pirate s Booty- Salinity and Buoyancy

The Mystery of the Pirate s Booty- Salinity and Buoyancy Buoyancy If you ve ever lain on your back in a swimming pool you have demonstrated the ability of an object to float in water. You float because

Density and Buoyancy. Chapter What is density and how can you measure it? 2. What two things does density depend on?

Chapter 4 Density and Buoyancy Will it float or will it sink? If you are designing ships this is a very important question. The largest ship in the world is the Jahre Viking, an oil-carrying tanker. This

Physics 250 Laboratory: Buoyancy

Physics 250 Laboratory: (Fluids) Score: Section #: Name: Name: Name: Lab-Specific Goals: To learn about density and buoyancy through experimenting with these concepts. Equipment List: Graduated cylinder

Fluids flow conform to shape of container. Mass: mass density, Forces: Pressure Statics: Human body 50-75% water, live in a fluid (air)

Chapter 11 - Fluids Fluids flow conform to shape of container liquids OR gas Mass: mass density, Forces: Pressure Statics: pressure, buoyant force Dynamics: motion speed, energy friction: viscosity Human

Quick Peek. H Students will learn about. H Students will design and. Students will learn about density, buoyancy, and how submarines dive.

Quick Peek sink, float, Hover design a submarine! Students will learn about density, buoyancy, and how submarines dive. Suggested Grade Levels: 4 8 Illinois State Learning Goals science 11.A, 11.B, 12.D,

LESSON 15: Floating Paper Clips ESTIMATED TIME Setup: 5 minutes Procedure: 5 10 minutes

LESSON 15: Floating Paper Clips ESTIMATED TIME Setup: 5 minutes Procedure: 5 10 minutes DESCRIPTION Utilize a careful technique to make a paper clip float on top of water. OBJECTIVE This lesson demonstrates

Buoyancy and Air Bladders: Passing gas Follow up in Textbook: pp. 421-423 A. Objective: Explain how fish swim bladders produce neutral buoyancy. Explain how changes in atmospheric pressure influence buoyancy.

Chapter 13 Fluids. Copyright 2009 Pearson Education, Inc.

Chapter 13 Fluids 13-1 Phases of Matter The three common phases of matter are solid, liquid, and gas. A solid has a definite shape and size. A liquid has a fixed volume but can be any shape. A gas can

4S Archimedes Test for Density

4S Archimedes Test for Density Density, or specific gravity of minerals is important in separating them. It is important to have a test for the density of mineral samples found at Snailbeach. Galena is

Buoyancy What floats your boat? Sink or float? Test The cube sinks to the bottom. WHY? Weight Due to the pulling force of gravity both the cube and the water have the property of weight. Gravity Gravity

Pascal s Principle. Any change in the pressure of a fluid is transmitted uniformly in all directions throughout the fluid.

Pascal s Principle What happens inside a fluid when pressure is exerted on it? Does pressure have a direction? Does it transmit a force to the walls or bottom of a container? Any change in the pressure

Why do objects float or sink?

Why do objects float or sink? Summary Students will use models to gain an understanding of the principles of buoyancy and how they apply to technologies used to explore the ocean Learning Objectives Students

Buoyancy Boats Florida Sunshine State Science Standards: Objectives Engage: Explore:

Buoyancy Boats Florida Sunshine State Science Standards: SC.C.2.3.1 The student knows that many forces act at a distance. SC.C.2.3.2 The student knows common contact forces. SC.C.2.3.3 The student knows

Concept Questions Archimedes Principle. 8.01t Nov 24, 2004

Concept Questions Archimedes Principle 8.01t Nov 24, 2004 Pascal s Law Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel

PHYS 1405 Conceptual Physics I Laboratory # 8 Density and Buoyancy. Investigation: How can we identify a substance by figuring out its density?

PHYS 1405 Conceptual Physics I Laboratory # 8 Density and Buoyancy Investigation: How can we identify a substance by figuring out its density? What to measure: Volume, mass. Measuring devices: Calipers,

Assignment 1 SOLUTIONS

Assignment 1 SOLUTIONS 1. 18k Gold The overall density is the total mass divided by the total volume, so let s think about the volume fo 1 gram of 18k gold, which I ll call V 1g 18k. The volume 1 gm of

Session 5 Density and Pressure

Session 5 Density and Pressure What makes a block of wood rise to the surface of a bucket of water? Why do your ears pop if you swim deep underwater? In this session, we will examine density, an essential

What Makes GloFish Swim?

Name Period Date What Makes GloFish Swim? Objective The student will learn how buoyancy affects GloFish fluorescent fish. Introduction Buoyancy is the upward push of water on an object that causes something

CONVECTION. cold water (red)

CONVECTION Name(s) PART 1 Convection and Density The physical world around us is constantly changing. The activities in this section of the unit will introduce a new model (convection) which is very powerful

AP2 Fluids. Kinetic Energy (A) stays the same stays the same (B) increases increases (C) stays the same increases (D) increases stays the same

A cart full of water travels horizontally on a frictionless track with initial velocity v. As shown in the diagram, in the back wall of the cart there is a small opening near the bottom of the wall that

Section 1 Fluids and Pressure

Section 1 Fluids and Pressure Key Concept Fluid is a nonsolid state of matter. All fluids can flow and exert pressure evenly in all directions. What You Will Learn Pressure is the amount of force exerted

Density and Archimedes Principle

Drexel-SDP GK-12 ACTIVITY Activity: Density and Archimedes Principle Subject Area(s) Measurement, Physical Science Associated Unit Measurement, module 2 Associated Lesson Activity Title Grade Level 6 (3-8)

Archimedes' Principle

OpenStax-CNX module: m42196 1 Archimedes' Principle OpenStax College This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 3.0 Abstract Dene buoyant force. State

Worksheet for Exploration 14.1: Floating and Density

Worksheet for Exploration 14.1: Floating and Density How can a boat made out of a material more dense than water float? The block has a mass of 0.185 kg (position is given in centimeters). If this block

25ml graduated. dish soap 100ml graduated cylinders. cylinders. Metric ruler with mm divisions. digital scale

You are challenged to get your film canister to float while filled with the most weight you can. The film canisters will not be capped, so if they go under water at all, they will sink. You want to get

Density and Buoyant Force

Density_and_Buoyant_Force_6c.docx Density and Buoyant Force An exploration of the relationships between weight, density, and buoyant force. 1.1 EXPERIMENTAL GOAL 1 OBJECTIVES Students will use Archimedes'

Physics 11 (Fall 2012) Chapter 13: Fluids

Physics 11 (Fall 2012) Chapter 13: Fluids "Keep in mind that neither success nor failure is ever final." Roger Ward Babson Our greatest glory is not in never failing, but in rising up every time we fail.

General Physics (PHY 2130)

General Physics (PHY 30) Lecture 3 Solids and fluids buoyant force Archimedes principle Fluids in motion http://www.physics.wayne.edu/~apetrov/phy30/ Lightning Review Last lecture:. Solids and fluids different

Exploring Buoyancy. Design Challenge Learning. https://www.thetech.org/educators/design- challenge- learning

How low can you go? Students are challenged to use their understanding of buoyancy, density, and pressure to design and build ocean exploring devices. As students iterate through this design challenge,

Density, Mass, and Volume Grade 3-6

Density, Mass, and Volume Grade 3-6 BACKGROUND Matter is everything that takes up space. Matter can be found in three forms, solid, liquid, and gas. The mass of an object is the amount of matter that is

Lab 11 Density and Buoyancy

b Lab 11 Density and uoyancy What You Need To Know: Density A concept that you will be using frequently in today s lab is called density. Density is a measurement of an object s mass per unit volume of

Schooner Adventure Water and Energy Keeping Things Afloat: Investigating Sinking and Floating

Schooner Adventure Water and Energy Keeping Things A: Investigating Sinking and Floating I. Why Do Things Float? What Sinks, What Floats? Predict and test whether various objects placed in water will or

Eighth Grade, Density To Float or Not to Float? 2004 Colorado Unit Writing Project 1

Density To Float or Not to Float? That is the Question! Grade Level or Special Area: Eighth Grade Science Written by: Aida Peterson, Clear Lake Middle School, Denver, Colorado Length of Unit: Twelve lessons

Density and Archimedes Principle

Density and Archimedes Principle Objectives: To understand the concept of density and its relationship to various materials. To understand and use Archimedes Principle. Equipment: Dial calipers, Graduated

Buoyancy and Density: Middle School Unit Plan

Buoyancy and Density: Middle School Unit Plan Questioning Strategies to Promote Critical Thinking Using a Conceptual Change Model (Integration of mathematics & physical science) Delena Norris-Tull and

Density and Archimedes Principle

Density and Archimedes Principle Objectives: To understand the concept of density and its relationship to various materials. To understand and use Archimedes Principle. Equipment: Dial calipers, Graduated

Timing This activity takes minutes to complete.

Module Overview This module is about density. Through several experiments, students will learn how to calculate the density of regular and irregular objects and liquids. They will also create a layered

Density Lab. If you get stuck or are uncertain, please ask questions and/or refer to the hints at the end of the lab. Name: Section: Due Date:

Name: Section: Due Date: Lab 01B-1 If you get stuck or are uncertain, please ask questions and/or refer to the hints at the end of the lab. Density Lab Density is an important concept in oceanography,

Name Date Class. The Nature of Force and Motion (pages ) 2. When one object pushes or pulls another object, the first object is

CHAPTER 4 MOTION AND FORCES SECTION 4 1 The Nature of Force and Motion (pages 116-121) This section explains how balanced and unbalanced forces are related to the motion of an object. It also explains

Rank in order, from largest to smallest, the magnitudes of the 3 forces required to balance the masses in the Figure. The masses are in kilograms.

Rank in order, from largest to smallest, the magnitudes of the 3 forces required to balance the masses in the Figure. The masses are in kilograms. A. F 1 = F 2 = F 3 B. F 3 > F 2 > F 1 C. F 3 > F 1 > F

Figure 1: The Net Force of the Fluid Acting on an Object Is the Buoyant Force

Buoyancy, Stability, and Ballast 1 Cornerstone Electronics Technology and Robotics III (Notes primarily from Underwater Robotics Science Design and Fabrication, an excellent book for the design, fabrication,

Density, Pressure and Change of State

Density, Pressure and Change of State Syllabus points: 5.1 use the following units: degrees Celsius ( o C), kelvin (K), joule (J), kilogram (kg), kilogram/metre 3 (kg/m 3 ), metre (m), metre 2 (m 2 ),

Activity P13: Buoyant Force (Force Sensor)

Activity P13: Buoyant Force (Force Sensor) Equipment Needed Qty Equipment Needed Qty Economy Force Sensor (CI-6746) 1 Mass and Hanger Set (ME-9348) 1 Base and Support Rod (ME-9355) 1 Ruler, metric 1 Beaker,

Newton s Third Law: A Verification with Buoyancy Forces

Newton s Third Law: A Verification with Buoyancy Forces Barry Feierman - April 2013 SEPS/AAPT Drexel University Newton s Third Law is the law of interaction. For every force that acts on one object, there

Educational Innovations

Educational Innovations AIR-444/446 Air Swimmers Next Generation Science Standards: 5-PS1-1 Develop a model to describe that matter is made of particles too small to be seen. 5-PS2-1 Support an argument

NWT Apprenticeship Support Materials

NWT Apprenticeship Support Materials Science Reading Comprehension * Module 1 Foundations * Module 2 Science Development * Module 3 Special Topics Math P A R T N E R S Education, Culture and Employment

POTATO FLOAT. Common Preconceptions:

POTATO FLOAT Unit: Salinity Patterns & the Water Cycle l Grade Level: Middle l Time Required: 30 min. (in class) after solutions are prepared by the teacher l Content Standard: NSES Physical Science, properties

Teaching Sciences by Ocean Inquiry SMS 491/ EDW 472 Spring 2008

Teaching Sciences by Ocean Inquiry SMS 491/ EDW 472 Spring 2008 * In this class with assume that students are already familiar with the concepts of mass, volume and their measurements. For inquiry-based

Grade 8 Activity Keep Your Head Above Water Do things that float behave differently in salt and fresh water? What lets them float, and when do they sink? Concepts Water has physical properties of density

Structure of the Earth/Density Test

Name Score /69 Structure of the Earth/Density Test Using the formula for density: to solve each problem, SHOWING ALL YOUR WORK, including UNITS. Refer to this chart to answer questions #1 & #2 Layer Approximate

Forces in Fluids (Chapter 13)

Forces in Fluids (Chapter 13) Outline/Information Questions/Review 1/19 I. Pressure = force distributed over a given area A. Formula = Force/ Area 1. increase force = increase in pressure (this is a direct