Teacher Notes



Teacher Notes
Publication No. 13876
Archimedes’ PrincipleStudent Laboratory KitMaterials Included In Kit
Marbles, 100
Modeling clay, 5 sticks Plastic cups, 1oz, 15 Plastic cups, 9oz, 15 Thread, 2 spools Weighing trays, 15 Additional Materials Required
Graduated cylinder, 100mL
Paper towels Scissors Spring scale, 100 × 1 g Prelab PreparationDivide the modeling clay into 30 to 35g pieces. Safety PrecautionsAlthough this activity is considered nonhazardous, please follow all normal laboratory safety guidelines. DisposalPlease consult your current Flinn Scientific Catalog/Reference Manual for general guidelines and specific procedures, and review all federal, state and local regulations that may apply, before proceeding. Materials from this lab can be reused many times or disposed of according to Flinn Suggested Disposal Methods 26a and 26b. Teacher Tips
Correlation to Next Generation Science Standards (NGSS)^{†}Science & Engineering PracticesAnalyzing and interpreting dataPlanning and carrying out investigations Using mathematics and computational thinking Disciplinary Core IdeasMSPS2.B: Types of InteractionsHSPS2.B: Types of Interactions Crosscutting ConceptsScale, proportion, and quantityCause and effect Performance ExpectationsMSPS31: Construct and interpret graphical displays of data to describe the relationships of kinetic energy to the mass of an object and to the speed of an object. Sample DataSubmerged Objects—Archimedes’ Principle
Floating Objects
Since the marbles are denser than water, they will sink and displace water equal to their volume. When the marbles are floating in the boat, the amount of water displaced is equivalent to their weight. Since the marbles are denser than water, their mass is greater than their volume, and therefore, more water volume is needed to float the cup with the marbles inside. The water rises as more water is displaced. When the marbles are thrown out, less volume is displaced, by the cup and by the volume of the marbles, so the water level lowers! Answers to QuestionsSubmerged Objects—Archimedes’ Principle
Floating Objects
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Student Pages


Student PagesArchimedes’ PrincipleIntroductionLegend has it that Archimedes ran through the streets of ancient Greece shouting “Eureka!” when he realized how he could utilize his density and water displacement experiments to demonstrate that the king’s crown was made of pure gold and not some imitation. This relationship between density and water displacement is known as Archimedes’ Principle. Concepts
BackgroundArchimedes was born about 287 B.C. in Sicily and was killed by a Roman soldier about 211 B.C. He is generally regarded as the greatest mathematician and scientist of antiquity and one of the three greatest mathematicians of all time along with Isaac Newton (1643–1727) and Carl Friedrich Gauss (1777–1855). Archimedes was very involved in a wide range of scientific and mathematical studies. {13876_Background_Equation_1}
Density is commonly expressed as g/cm^{3} or g/mL. The density of pure water is 1.00 g/cm^{3} at 20 °C. Objects with a density greater than 1.00 g/cm^{3} will sink in pure water. Objects with a density less than 1.00 g/cm^{3} will float in pure water.
Materials
Graduated cylinder, 100mL
Marbles, 6 Modeling clay, 30 to 35g piece Paper towels Plastic cup, 1oz Plastic cup, 9oz Pipet, Beraltype Scissors Spring scale, 100 x 1 g Thread, 12–24 Weighing tray Safety PrecautionsAlthough this activity is considered nonhazardous, please follow all normal laboratory safety guidelines. ProcedureSubmerged Objects
Archimedes’ Principle applies to objects submerged in liquids. What about objects floating on the top of liquids?
Student Worksheet PDF 