ࡱ> ^`]cdefghe ybjbjWW E55u  aa$PmTn.q%%%?nAnAnAnAnAnAnpsxAnE%$%%%Anaa nL)L)L)%Lal?nL)%?nL)L)Ae ,iS%ag<+nn0ngtr&txiiti4%%L)%%%%%AnAnL)%%%n%%%%t%%%%%%%%% ': Devil EMBED Imaging.Document Physics Baddest Class on Campus DENSITY, BUOYANCY AND FORCE DIAGRAMS This lab was adapted from a lab submitted to PhET by Chris Bires (HYPERLINK "mailto:bires1@hotmail.com"bires1@hotmail.com) of Spring Valley HS on 10/13/2010 and was updated 4/8/2014. Introduction Youve heard that oil floats on water. You also know that ice cubes normally float in a glass of water. Why? What causes some things to float in water (corks, ice, dogs) and some to sink in water (rocks, metal spoons, mobsters)? Density is often described as the amount of mass crammed into a volume, and is illustrated by the formula shown below. The units for density are expressed g/cm3, g/mL, kg/m3, and kg/L. In this simulation, we will use kg/L. Waters density is 1.00 kg/L.  Important Formulas:  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  Procedure: Go To: HYPERLINK "http://phet.colorado.edu/en/simulation/density"http://phet.colorado.edu/en/simulation/density Click Run Now. If that doesnt work, click Download Take a few minutes and familiarize yourself with the simulation before moving on. Free Body Diagrams for Floating Objects: Grab the various blocks, lift them over the water and drop into the water a few times. In the boxes at the right, draw free body diagrams for a falling block, a floating wood block, and a block under water resting on the bottom of the tank. (. If you are planning on submitting this lab electronically, use the Shapes function of Word to draw force vectors and Textbox to add labels. When is the block accelerating? ____________________________________ What should be the net force in the vertical direction when the block is floating? The %-Density Ratio Trick Estimate the percentage of the wood, ice, and Styrofoam block that will be under water while those blocks are floating. Write your estimates in the chart below. % Wood under water% Ice under water% Styrofoam under water Compare your estimations to the densities shown on the chart. Place the charted densities in the table below. Density of WoodDensity of IceDensity of StyrofoamHow do these compare? Using the density of the object and the density of the fluid, create a formula to show how much of a floating object would be submerged in any fluid. Remember: the density of water is 1.00 kg/L and units have to cancel in your formula. % under water = Calculating Density Using the simulation for each scenario listed on the box at the right, complete the tables below. If the block goes all the way to the bottom, write bottom. To determine volume of an object when it floats, hold it under the water to determine the fluid displacement (increase in water volume). Same Mass Block% submerged or "sunk"Mass, kgVolume, LDensity, kg/LBlue5.00Yellow5.00Green5.00Red5.00Same Volume Block% submerged or "sunk"Mass, kgVolume, LDensity, kg/LBlue5.00Yellow5.00Green5.00Red5.00 Same Density Block% submerged or "sunk"Mass, kgVolume, LDensity, kg/LBlue0.80Yellow0.80Green0.80Red0.80Mystery Block% submerged or "sunk"Mass, kgVolume, LDensity, kg/LYellow, ABlue, BGreen, CRed, DPurple, EConclusion Questions Increasing the volume of an object without increasing its mass increases / decreases / doesnt change the objects density (circle) Increasing the mass of an object without increasing its volume increases / decreases / doesnt change the objects density (circle) An object with a density of .67 kg/L would float 1/3 , 1/2 , 2/3 under water. (circle) An object floating partially above the surface has an upward buoyant force that is equal to / larger than / less than the downward weight. An ice cube dropped into a glass of 100% ethanol (density=. 789 kg/L) would sink / float. Using the formula you found for the %-density ratio, determine the percentage of a wood block ( = 0.400 kg/L) that would be submerged in ethanol. Determine the density of an unknown metal that displaces 4.5 L of water and is found to have a mass of 25.4 kg. What volume of water will a 1.00 kg metal block displace with a density of 7.00 kg/L? What volume of water will a 1.00 kg plastic block ( = 0.60 kg/L) displace when floating? (careful) Imagine holding the above plastic block under water. When released, what is the upward acceleration of the block? (use g = 10 m/s2) The red block in the Same Volume floats in water. The blue block sinks in water. Using your data from the chart above and your knowledge of buoyant forces and weights, what volume of the blue block would float above the water line if the blue block was placed on top of the red block in the water? 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Smith Kyle Smithx                   CompObjcy