Density Phet assignment PDF

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Density Phet assignment...

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Density PhET Assignment A. Read the “Introduction” section of the “Measurement: Mass, Volume, & Density” lab in the lab manual. A pdf copy of it has also been uploaded into the Module. B. You do not need to write a full lab report for this lab. Follow all of the the steps below. All data and calculations must be recorded in your lab composition book. Include a Title, date, and page numbers. You can record the data and calculations on this worksheet, then cut/copy/paste it into your composition book, or you can record all data and calculations directly into the comp. book. C. Follow this link to find the density simulation on the PhET website: http://phet.colorado.edu/sims/density-and-buoyancy/density_en.html D. Make sure that you are in the “Custom” setting. When you see the wooden block, grab it with your mouse and put it in the water. Note that you can manipulate the blocks by pushing them underwater. Also note the two boxes at the top of the screen that you allow you to change various settings. Wooden block: 1. Mass= ______ Volume = _______ Density (show calculation):________ 2. How much of the block is under the water? ________ 3. How much water did the block displace? Show your calculation__________________________ 4. Take a screenshot of the simulation and paste it into your composition book. Manipulate the blocks and use different materials to find out the following: 1. When objects float, they displace an amount of water equal to their: ___________. Explain or show how you determined this:_____________________________________________________ ______________________________________________________________________________ 2. When objects sink, they displace an amount of water equal to their: __________. Explain or show how you determined this:_____________________________________________________ ______________________________________________________________________________ 3. What is the density of water?________________ 4. Is there a relationship between the volume of water displaced and the total volume of the block that has anything to do with density? If so, what is it? ___________________________________________________________________________ ___________________________________________________________________________ 5.

How do you think this activity would change if the objects were placed in a denser liquid like Mercury? Explain your reasoning. ______________________________________________________________________________ ______________________________________________________________________________

E. Now choose the “Same mass” setting. Fill in the following table (show all calculations):

color

Mass ( Kg)

Volume ( L)

D ( kg/L)

V of water displaced ( L)

Blue Yellow Green Red

F.

Now choose the “Same volume” setting. Fill in the table below (show all calculations):

color

Mass ( Kg)

Volume ( L)

D ( kg/L)

V of water displaced ( L)

Blue Yellow Green Red

G. Now choose the “Same density” setting. Fill in the table below (show all calculations): color Blue Yellow Green

Mass ( Kg)

Volume ( L)

D ( kg/L)

V of water displaced ( L)

Red H. Now choose the “Mystery Blocks” setting. Fill in the table below (show all calculations): Block

Mass ( kg)

Volume ( L)

Density ( Kg/L)

Material ?

A B C D E

1. Put the blocks in order from least dense to most dense: ________________________________ 2. Which blocks would float? _______________ 3. Which blocks would sink? _______________

I.

Graphing activity:

Go back to the “custom” setting and complete the data tables below for 5 different blocks of each material listed: wood, Ice, Brick and aluminum Wood Mass

Volume

Density

Volume

Density

Ice: Mass

Brick : Mass

Volume

Density

Volume

Density

Aluminum: Mass

Remember from Algebra the “slope intercept” form of the equation for a line.

y=mx + b .

1. Formulate a way to graph your data for mass and volume that allows you to read the density from the graph. Y= ________ m= _______ x= _________ b= __________ 2. Graph your data for just one of the types of blocks (wood, ice, bricks, or aluminum) using an appropriate scale. Give the graph a title and label all axes. You can either use excel, or you can use the graph paper provided on the next page, or you can manually draw a graph using a ruler. Draw a best-fit-curve (trendline). Paste the graph into your composition book. 3. What is the slope of the trendline? (show the calculation if you drew the graph; show the slope on the graph if you used excel). How does it compare to the density on your table? ________________________________________________________________________________

4. What does the slope of the line on your graph indicate about density? _________________________________________________________________________________...