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Buoyancy and density Activity answers

Density, Buoyancy and. Archimedes' Principle. UM Physics Demo Lab 07/2013. Pre-Lab Question. What two vertical forces act on an object floating in equilibrium, partially submerged in a liquid About This Quiz & Worksheet. With this quiz and worksheet, you will get a better understanding of density and buoyancy. Topics in the quiz include defining buoyancy and density, recalling the. Q. Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the... Q. True or False: Buoyancy is an upwards force measured in Newtons. Q. Archimedes' Principle states that... The buoyant force acting on an object equals the volume of the fluid displaced by the object

Quiz & Worksheet - Lab for Density & Buoyancy Study

  1. Intro: Give a brief description of what the relationship is between mass, volume and density of each object and how it affects whether the object will sink or float. Lab Setup 1. Click over to the Buoyancy Playground and begin the lab. 2. There are 5 different fluids to choose from in the lab and five different types of materials
  2. Lab Activity on Density, Buoyancy and Convection Lab Activity on Density, Buoyancy and Convection Combining your answers to questions 2 and 3, explain which of the two fluids is more buoyant and why. 5. [Filename: 26ConvectionLab.pdf] - Read File Online - Report Abus
  3. Have students complete the worksheets and turn them in for grading. The next day, review the answers in a class discussion in order to clarify any misconceptions and reinforce answers for everyone's benefit. Vocabulary/Definitions buoyancy: The ability of an object to float in a liquid. density: A measurement of the compactness of an object

Bookmark File PDF Phet Density Activity Answers Phet Density Activity Answers Phet Density Answers. July 13th, 2013 20:08:01 PM . Exploring Buoyancy and Density With an Online Simulation Suggested questions, approaches, and expected answers are all provided.... density of the object they see sinking and/or floating in each set of pictures.. Increasing the size of an object increases / decreases / doesn'r change the object's density (circle) 2. An object with a density of .67 kg/L would float 1/3, 1/2, 2/3 under water (circle) 3. A floating object has an upward buoyant force that is equal to/larger than / less than the downward weight. 4. An ice cube dropped into a glass of 100%. buoyancy: The ability to float in a liquid (or rise in a gas). density: The mass per unit volume of a substance at a given pressure and temperature. Assessment Concluding Discussion: Lead a class discussion in which students share and compare their results, observations, conclusions and questions. Ask the Investigating Questions View Phet Lab Answers Buoyancy Simulation Activity.docx from SC SC1130 at ITT Technical Institute Nashville campus. Due 10/7 Name _answers Date _10/6_ Buoyancy and Density Activity Part 1: Write a

Density and Buoyancy: Description Activity for exploring density of various objects. Duration 60 minutes: Answers Included No: Language English: Keywords Buoyancy, Density, Mass, Volume: Simulation(s) Density Buoyancy And Density. Buoyancy And Density - Displaying top 8 worksheets found for this concept.. Some of the worksheets for this concept are Chapter 5 density and buoyancy, Buoyancy work, C4 buoyancy work 2 phet, Skills work directed reading b, The floating egg, Buoyancy problem set, Lesson plans on density for middle school teachers, Density notes Lab 8: Buoyancy and Archimedes Principle Description In this lab, you will explore the force that displacing a fluid (liquid or gas) will exert on the body displacing the fluid. You will study how the balance of forces between weight of the object and the buoyancy force on the object allow objects to float. Equipment •Graduated Cylinde 1. Students will be able to demonstrate the difference between positive buoyancy, negative buoyancy, and neutral buoyancy. 2. Students will be able to apply the key concepts of buoyancy, density, and the balancing of forces to create a device that is capable of diving and surfacing. 3 On the top of the screen, click the tab that says Buoyancy Playground. Make sure all the check-boxes are marked like the previous screen. In the box in the top left corner, click the circle that says My Block. 1) Find and record which mass and volume creates a block with the density of 1.59 kg/L. Also record its weight

1. $9.99. Zip. This fully editable Lab Station Activity on Mass, Volume, Density, & Buoyancy is meant to get your students out of their seats and engaged in the content. This activity was designed for Middle School science students.Each station not only offers a unique opportunity to test your students' knowle 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 • Density is defined by the ratio of the mass of a substance to its volume. • For an object to float, relative to its surroundings, it must be less dense than its surroundings. • Density is a principle that is found in many of Earth's processes, including the water cycle. • Density affects the workings of hot air balloons

Density & Buoyancy Other Quiz - Quiziz

  1. Density Lab Online Activity Vocabulary: buoyancy, density, graduated cylinder, mass, matter, scale, volume Prior Knowledge Questions (Do these BEFORE.) 1. Of the objects below, circle the ones you think would float in water. 2. Why do you think some objects float, while others sink
  2. Physics. Physics questions and answers. Lab 11 -- Buoyancy and Archimedes' Principle OBJECTIVE To explore the behavior of several simple systems that are influenced by buoyant forces EQUIPMENT NEEDED Available in the room: Aquarium with boat Metal load for the boat (may be wrapped in cloth) Wood for the boat Cartesian diver Water Der Available.
  3. Read PDF Phet Density Sim Answers Buoyancy - PhET Download Ebook Phet Density Simulation Answer Key acquire the phet density simulation answer key. However, the lp in soft file will be with easy to admission all time. You can acknowledge it into the gadget or computer unit. So, you can air hence simple to overcome what call as good reading.
  4. ‪Density‬ - PhET Interactive Simulation
  5. es the buoyancy of the fluid? Explain. 4. Combining your answers to questions 2 and 3, explain which of the two fluids is more buoyant and.
  6. This activity is always a hit with the students, and I love it, too. It is an excellent demonstration of the density of liquids and how density affects buoyancy. Students will calculate the densities of five liquids and then hypothesize what will happen when they are poured together and then what w

In Activity 2, we found the densities of blocks 1, 2, 8, 4, and 5 to be .72 g/cm 3, .77 g/cm 3, .70 g/cm 3, .59 g/cm 3, and .87 g/cm 3 respectively. In Activity 3, the balance read that the pendant was 158.3g when in the air, and 138.6g when in the water. We calculated the volume of the pendant to be 19.7 cm 3, and the density to be 8.04 g/cm 3. Grade 8 Buoyancy. Grade 8 Buoyancy - Displaying top 8 worksheets found for this concept.. Some of the worksheets for this concept are Forces in fluids pressure buoyancy and archimedes, Grade 8 science unit 3 fluids viscosity, Buoyancy work, Buoyancy archimedes principle, Chapter 5 density and buoyancy, Grade 8 c3, Lesson plans on density for middle school teachers, Introduction Assume the water has a weight density of 62 lbs/ft 3. A balloon weighing 80 kg has a capacity of 1200 m 3. If it is filled with helium, how great a payload can it support? The density of helium is 0.18 kg/ m 3 and the density of air is 1.30 kg/ m 3. Express your answer in newtons A lab activity looking at the relationships associated with Archimedes' Principle, namely buoyancy, buoyant force and density. Subject Physics: Level High School, Middle School: Type Lab: Duration 60 minutes: Answers Included No: Language English: Keywords archimedes principle, buoyancy, buoyant forc

Warm Up: What do you think has a greater density, molten lava or volcanic rock? Explain your answer. Activity: • csmurray Density and Buoyancy notes LAB: • Hands-on measurements- mass, volume, density • Use scales, balances, graduated cylinders and displacement method to determine dimensions of objects with same size but different densitie Density and Buoyancy Practice Test. Multiple Choice. Identify the choice that best completes the statement or answers the question. ____1.Density depends on ____ Unformatted text preview: II.4.b Density Lab Name: Answer the questions in the shaded areas. Vocabulary: buoyancy, density, graduated cylinder, mass, matter, scale, volume Prior Knowledge Questions: 1. Of the objects below, circle the ones you think would sink in water. I think cruise ship and a beach ball would float. 2 Object B must therefore be the least dense, followed by D, A, and F. Object E is next, because it is neutrally buoyant and equal in density to the liquid. Object C is negatively buoyant because it is more dense than the fluid. Full answer to the question: B, D, A, F, E, C. 3 Document details ( B) L anguage . Pa g e setup. Print pre v iew. P rint Ctrl+P. E x port options disabled. U ndo Ctrl+Z. R edo Ctrl+Y. Cu t Ctrl+X

Periodic Table Activity Worksheets |

Phet Density Answers - Free PDF File Sharin

  1. How to Calculate Buoyancy Buoyancy and Density Fluid Mechanics: 9) Buoyancy - Practice Problem MCAT Question of the Day: Buoyancy Force 9 cm tall answer the following questions. 1. Buoyancy Worksheet The buoyant force, FB= density of fluid * volume * g = 4.5 N Therefore, the normal force FN= 6.8 N (d) Repeat parts b and c, only instead of.
  2. Extension Activity. Give each child a sheet of paper with a bowl of water outlined on the sheet. Ask the group to draw pictures of the objects that were place into the water. Place the pictures of objects that float at the top of the water line and objects that sink down at the bottom of the bowl. Let the children color their picture with crayons
  3. What happens when you change the density of the water by adding salt, baking soda, or sugar to it? Try the simple activity in this post to find out. Recommended Books about Buoyancy. Who Sank the Boat?, Pamela Allen. Things That Float and Things That Don't, David Adler. Thank you Wonderful Halos for sponsoring this post. All opinions are my own
  4. Acces PDF Density And Buoyancy Phet Lab Answers Density And Buoyancy Phet Lab Answers Yeah, reviewing a ebook density and buoyancy phet lab answers could amass your near contacts listings. This is just one of the solutions for you to be successful. As understood, carrying out does not suggest that you have astonishing points
  5. density and buoyancy phet lab answers at our online ebook library get density and buoyancy phet lab buoyancy and density activity name date directions go to the following website to use an interactive simulation to work with. buoyancy and density, density mass volume phet interactive simulations the majority of these virtual demos.
Density Viscosity Buoyancy Worksheet - Worksheet : Resume

Hands-on Activity Rock and Boat: Density, Buoyancy

Objects That Sink In Water Have A Density

About This Quiz & Worksheet. You can expect to be tested on concepts dealing with things like the reason for buoyant force, Archimedes' Principle, and buoyancy's calculation Download Pool Cubes 2 Buoyancy Answer Key PDF April 15th, 2019 - Buoyancy Phet Lab Answers Pdf Download opened enable and reload pool cubes buoyancy phet lab answer key google docs lesson on density and instructions for phet simulation lab on density hopefuly it will help you understand basics of density skip navigation lesson on density and where ρ (rho) is the density of the fluid, V is the volume of fluid displaced and g is acceleration due to gravity. It is the buoyant force that keeps ships afloat in water and hot air balloons floating in air. In this experiment, the buoyant force will be measured three ways and the results compared. The first method is by the measurement of. Taking the density of water as unity, the upward (buoyancy) force is just 8 g. The apparent weight will be (36 g) - (8 g) = 28 g. Problem Example 2. A balloon having a volume of 5.000 L is placed on a sensitive balance which registers a weight of 2.833 g. What is the true weight of the balloon if the density of the air is 1.294 g L-1 Buoyant force is directly proportional to the density of the fluid in which an object is immersed. Buoyancy is the tendency to rise or float in a fluid. The upward force exerted on objects submerged in fluids is called the buoyant force. The formula for buoyant force is F=ρVg = mg where ρ is the density, V is the volume, and m is the mass of the displaced fluid. g is the acceleration due to.

Archimedes' Principle itself isn't directly about volume, it's about buoyancy. It states that the buoyant upward force acting on an object entirely or partially submerged in a fluid is equal to the weight of the fluid displaced by the object. For a given object, the weight can be directly calculated from the mass or from the density and Density. Density is the amount of mass per unit volume of a substance: (8-1) For substances with constant density (has the same amount of mass in every unity volume throughout the object) the density is (8-2) M is the total mass of the object and V is the total volume. In this experiment, we wish to find the density of three unknown metals Buoyancy Force Preformed on: 1/29/ Aim: The aim of this lab is to determine the buoyancy force on different objects, and then use this buoyant force to measure the density of a liquid. Theory: The upward force on an object placed in a fluid is equal to the weight of the fluid it displaces, FB=Wf Possible lesson outlines of this modular activity: This is the lesson as currently written. It begins with the physics of buoyancy before transitioning to fish biology and how it's related to fisheries . Activity Time required 1 Introduction and background 50 min 2 Boat Sinking Lab 50 min 3 Fish Buoyancy 50 min 4 Fishing expedition 50 mi

Density Laboratory. Launch Gizmo. With a scale to measure mass, a graduated cylinder to measure volume, and a large beaker of liquid to observe flotation, the relationship between mass, volume, density, and flotation can be investigated. The density of the liquid in the beaker can be adjusted, and a variety of objects can be studied during the. Numerous lower-density objects or substances float in higher-density fluids: oil on water, a hot-air balloon in the atmosphere, a bit of cork in wine, an iceberg in salt water, and hot wax in a lava lamp, to name a few. A less obvious example is mountain ranges floating on the higher-density crust and mantle beneath them An object floats on the surface of a liquid when the downward force of gravity of the object is balanced by the upward force of buoyancy. W = B. The weight of an object is its mass times gravity, and mass is density times volume. W = m object g = ρ object gV object. Buoyancy is the weight of the fluid being displaced

Name: Density. Buoyancy, and Force Diagrams PhET Chegg.co

After the activity, have the students read about Archimedes' Principle and answer the questions. Discuss the results they came up with. If they have done density, can they figure out why 1 is the magic number for floating or sinking (water has a density of 1g/cm 3 ) This is part 1 of a 5 part hands-on unit study on Floating & Flying (Fluid Mechanics). This week's focus is buoyancy (floating). Build an aluminium foil barge that can hold the most pennies, experiment with what floats and sinks and why, explore the relationship between density and buoyancy, and more! My lessons are geared toward 4th-5th grade level children and their siblings density and buoyancy. Activity sheet PHY_142: Balloons and Buoyancy Student learning outcomes / lesson objectives Describe how the buoyant force also applies in a gas. Analyze the occurrence of the buoyant force at a molecular level. Explain how density varies in the gas state I made this video for TSW 10 of EU1 in my Physical cience course. Hopefuly it will help you understand basics of density

Buoyant Boats - Activity - TeachEngineerin

Buoyancy Buoyant force is the force that a fluid exerts on a object that is immersed within it. It is called buoyant force because this force is a lifting force, often making the object buoyant. Buoyant force can be calculated using Archimedes' Principle. Word Problems to help you understand buoyant force and Archimedes' Principle Examples: 1 The closer its density is to 1 g/cm3, the more of it will sit below the water level. An object with a density of 0.5 g/cm 3 will sit half in and half out of the water. Three-quarters of an object with a density of 0.75 g/cm 3 will be submerged. Another way to look at the buoyancy of an object is as an interaction between two forces Answers Holt Physicswhen the downward force of gravity of the object is balanced by the upward force of buoyancy. W = B. The weight of an object is its mass times gravity, and mass is density times volume. W = mobjectg = ρ objectgVobject. Page 23/4

PhET Simulation: Density. published by the PhET. This simulation provides a highly visual, intuitive way for students to explore how density is related to an object's mass and volume. Using a virtual water tank, users drop various objects to see what floats and what sinks. Use the mouse to submerge the object and see how much fluid it displaces The answer lies in the density of water! Density is a measure of the mass per unit volume of a substance. Simply said, how much stuff in a given volume. Water has a density of 1 g/mL (g/cm3). Objects will float in water if their density is less than 1 g/mL. Objects will sink in water if their density is greater than 1 g/mL Find the density of your fluid. The next step in the process of finding the buoyancy force is to define the density (in kilograms/meter 3) of the liquid that the object is submerged in. Density is a measure of an object or substance's weight relative to its volume.Given two objects of equal volume, the object with the higher density will weigh more Balloons And Buoyancy Simulation Answers When people should go to the ebook stores, search creation by shop, shelf by shelf, it is in fact problematic. Report Sheet Lab 7 Answers Timberlake, chapter 29 lab activity rock correlation answers, An Elemental Challenge Worksheet Answers, gpb physics note taking guide answers, Ssd1 Answers Exam 1.

San Juan Unified School District / Homepag Get Free Phet Balance Lab Answer Key Phet Balance Lab Answer Key Yeah, reviewing a book phet balance lab answer key could add your Phet Density Answers - Free PDF File Sharing During this activity students will explore the different parts of an atom and how protons, neutrons and electrons. After that students will build different types. 4-Buoyancy a couple of kids (weighing 70 and 75 lbf) are playing on a raft in lake fayetteville (ρ 62.4 the Learning Activity 1-1, Medical Terminology - Parts Of The Human Body; assume that an iceberg h as a density of 920 kg/m 3.. April 7th, 2019 - Buoyancy and Density Activity Name Date Directions Go to the following website to use an interactive simulation to work with buoyancy and density pool cubes 2 buoyancy answer key pdf, density buoyancy phet lab, buoyancy and 9 / 10. density activity name date ckschools org, phet simulation balloons amp buoyancy. PRELAB: Density and Buoyancy Answer the following questions with a complete paragraph answer. 1. An empty closed aluminum can is dropped into a bucket of water. Will the can float or sink? Explain your answer. 2. If the same aluminum can were filled with cooking oil, closed and then dropped into a bucket of water would it float or sink

Phet Lab Answers Buoyancy Simulation Activity - Due 10\/7

Density and Buoyancy - PhET Contributio

First, your body type has a lot to do with your buoyancy. Fat floats, as you've probably heard, while your bones and muscles, denser than fat, are not as willing to float. Also, the relative size of your lungs to the rest of your body determines how high in the water your body will float. Second, the density of the water is a factor Density & Buoyancy. Density is the amount of matter in a given amount of space. Density = mass/volume (g/mL) or (g/cm3) Buoyancy is an upward force that keeps things afloat. Archimedes' principle - A body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. If the weight of water that is displaced by an. Be sure to use the words buoyancy, surface area, and density in the description. Activity Two: Will it Float? Description: Students will determine whether objects will float or sink in water, create a hypothesis, and test objects Density = _____ Formula to calculate density: density = _____ units _____ 1. Use the first website for questions 1-2. For this practice, make sure that the block is completely submerged in the water. Pick one of the blocks. To complete this table you need to change the volum density. Density can be calculated. Density is the mass per unit of volume. It is usually measured in grams per millilitre (g/mL) or kilograms per litre (kg/L) for liquids or gases. The units for density of solids are usually grams per cubic centimetre (g/cm3) or kilograms per cubic metre (kg/m3). This formula can be used to calculate density

Buoyancy And Density Worksheets - Kiddy Mat

Boats and Buoyancy: Sink or Float? What's the DifferenceBuoyancy Lesson Plans & Worksheets | Lesson Planet

WebQuest: Density and Buoyanc

In other words, the buoyancy is equal to the weight of the displaced fluid. buoyancy: The upward force that a fluid exerts on an object less dense than itself; the ability to float. density: How closely packed together the molecules of an object or substance are. displace: To push out of the way. For example, when an object goes into water, it. Physics 1021 5 Experiment 4 Buoyancy Back to Basics QUESTION 1:Refer to Prelab 2, write the net force equation in terms of the mass of the cylinder ), its cross sectional area +, the density of the fluid , distance submerged ℎ, tension in the paper clip -, and gravity &. QUESTION 2:a) Sketch what a plot of -vs ℎwould look like? b) Write the equation for the slope of this graph The relative density of one water mass in relation to another determines whether a layer of water floats or sinks. Density and Buoyancy. Density can be determined by measuring the mass and volume of an object. In the Density Bags Activity, density was not calculated. Instead, relative density was determined by observing whether a bag of one.

students to apply what they learned about density, buoyancy, and pressure to the physiological limitations for safely escaping from a submerged, stranded submarine. Students will generate an info-graphic that embodies each of the learning activities. Prior Knowledge: 1 BUOYANCY OR WHAT FLOATS YOUR BOAT Grades 5 - 8 In this lesson, students will learn as Bill Nye the Science Guy discovers buoyancy. In this episode Bill Nye explores buoyancy through cars that are. Hands-on Activity: Buoyant Boats (2019) An article from the Pratt School of Engineering at Duke University that includes background information and engineering-focused activities to demonstrate buoyancy. The website also contains a video (2:47 min.) on buoyancy. The real story behind Archimedes' Eureka! (2015 of solids answer key, activity 5 6 physical property analysis madison high lead the way activity answer key, activity 5 4 properties of geometric solids kharisma s, activity 5 3 determining density weebly, activity 5 4 calculating properties of solids answer, activity 5 4 buoyancy described by the archimedes principle the volume of. Student Exploration Density Laboratory Answer Density_laboratory_gizmo_answers Mass and Volume Measurments Lab Mass and Volume Measurments Lab by Dr. Richard Musgrave 1 year ago 19 minutes 1,367 views Lab: Density Lab: Density by dchummer CHEMISTRY 3 months ago 8 minutes, 42 seconds 66 views A simple , density , lab where we collect the data.

Phet Density Worksheet Answers | Free Printables Worksheet

Buoyancy And Density Worksheets & Teaching Resources Tp

LAB - Buoyancy. We actually know specifically what the buoyant force is: the buoyant force on a submerged body must be equal to the weight of the fluid displaced by the submerged body. We can use this property of the buoyant force to measure the density of an object by submerging it in a fluid Buoyancy is the force that causes objects to float. It is the force exerted on an object that is partly or wholly immersed in a fluid. Buoyancy is caused by the differences in pressure acting on opposite sides of an object immersed in a static fluid. It is also known as the buoyant force. Buoyancy is the phenomena due to Buoyant Force Density and Buoyancy: Milton Johnson: MS HS: HW Lab: 10/18/10: PhET Sims Aligned to the Chemistry Curriculum: Julia Chamberlain: UG-Intro HS: Other: 5/27/15: Sink and Float Activity: jerson genovia and Nelfa perocho: HS MS UG-Intro: Guided Demo: 8/30/15: MS and HS TEK to Sim Alignment: Elyse Zimmer: MS HS: Other: 8/23/15: Pool Cubes 1 - Density.

Lab 11 -- Buoyancy and Archimedes' Principle Chegg

Station: Neutral Buoyancy www.e.c 6 Directions: Buoyancy is the force of a liquid pushing up on an object. When an object has neutral buoyancy, it hovers in the water and doesn't fully sink or float. Complete the investigation below to see what conclusion The buoyancy simulator graphically and diagrammatically represents the forces on a block immersed in a fluid. The density of the block and fluid can be changed, as well as the volume of the block. The amount of the block immersed in the fluid can also be changed to see how the tension and buoyant force changes with volume immersed

‪Density‬ - PhET Interactive Simulation

Buoyancy Worksheets & Teaching Resources Teachers Pay

Fluid Density Styrofoam Wood Ice Brick Aluminum How does the fluid density at which the object sinks compare to the density of the object? Lab Procedure: Part 3. In this part of the lab, determine the amount of buoyant force, gravity force and contact force that is acting on each block. Set volume to 5L Archimedes' principle is the statement that the buoyant force on an object is equal to the weight of the fluid displaced by the object. The simplicity and power of this idea is striking. If you want to know the buoyant force on an object, you only need to determine the weight of the fluid displaced by the object Answer Key Gizmo ready: Activity B: Drag all the objects back onto the shelf. Liquid density Check that the Liquid density is still 1.0 g/mL. DensityLabSE Key | Buoyancy | Density To calculate an object's density, divide its mass by Page 11/34. Acces PDF Student Exploration Density Answer Key density to the laboratory density. this is.

Archimedes' Principle and Buoyancy Lab Report

buoyancy density, activity 5 4 calculating properties of solids docsbay, activity 5 1 calculating properties of shapes, quia lead the way activity answer key created date 11 3 2014 8 42 48 pm, introduction to engineering design activity 5 4 calculating properties of solids page 3 f if a cylinder for a larger window is cu Students must be able to follow precise directions to measure mass and volume in order to calculate an objects density. These procedures gives the students hands-on experience using the density formula in ways that book learning never can. This activity is designed to complement another lab called: Density Lab (Volume by Formula) The buoyant force is proportional to the volume of the displaced fluid. This only applies to the volume of the object if the object is fully submerged. In this case, the volume of the displaced fluid is equal to the volume of the object. If we ass.. K-12 Lesson Plans: This activity uses a condiment packet to teach students how fish use their swim bladders to rise and descend in the water. The students will also learn about density, buoyancy, and sinking and floating

Grade 8 Buoyancy Worksheets - Kiddy Mat

worksheet Archives - Science Notes and ProjectsNASA - Neutral Buoyancy: Astronaut Training Is Not AlwaysExploring Convection Currents Lab Activity - Melinda V