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LAB 1: PROPERTIES OF MATERIALS By Yuliya, Katrina, Stephen and Johanna

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Purpose To determine the relationship between mass and volume of objects with the same densities. ?

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Theory We predict that there is a linear relationship between mass and volume. Density = mass/volume density X volume = mass (keep density constant) ObjectMass (g)Volume (ml) Metal Screw124 Metal Nail93 Metal Cylinder155

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Predicted Graph

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Procedure Materials: scale, graduated cylinder, 10 various objects (at least) that will be similar in density (ex: metal) Steps: 1) Pick one of the objects, measure its mass and record it at least ten times to calculate an uncertainty for this measurement 2) Fill graduated cylinder to a clear level where you can tell the difference in a change of volume. Take uncertainty for this measurement as well. 3) Drop the weighed object inside the cylinder and record the volume. 4) Perform steps 2-3 for each object, however you can take each measurement only once. Record Findings.

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Data Table of Mass and Volume for Objects of Similar Densities ObjectDescription Mass (+/- 0.02 g) Volume (+/- 0.3 ml) 1Gold screw45.835.7 2 Copper cylinder 55.714.5 3Silver cylinder49.824.5 4Flat rectangle26.421.5 5Nail15.732.0 6Steel ball16.112.0 7 Silver long cube 63.316.5 8 Medium steel rod 28.92.5 9Thin steel rod24.591.9 10Baby steel rod10.611.0 11Copper small cylinder 28.892.5

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Graph of Mass vs. Volume

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Uncertainties ????????????? Uncertainty Measurements: Mass Uncertainty: Mass of gold screw (g): 45.82, 45.84, 45.83, 45.82, 45.83, 45.82, 45.81, 45.83, 45.82, 45.83] No outliers found. Therefore average mass of the gold screw is: 45.83 g +/- 0.02g Volume Uncertainty Volume of gold screw (ml): 125.5, 125.5, 125.6, 125.7, 126.0, 125.8, 125.7, 125.6, 125.9, 125.8 No outliers found. Therefore the average volume of the gold screw is: 5.7 ml +/- 0.3 ml

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Analysis Based on the graph, it is clear that there is a proportional relationship between mass and volume. When objects with relatively similar densities but different masses were placed in a graduated cylinder and the volume was taken and graphed relative to other objects, objects with greater mass also had greater volume. Compare two coordinates on the graph. 1.8 mL and 20 g vs. 3.8 mL and 40 g The equation of the line is y=0.1x+0. It is important to note that objects with identical densities were not used in this experiment. To do the experiment more accurately, it would be important to choose objects with the same density so that this variable can be controlled for.

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Conclusion Based on our data….. An object's mass is directly proportional to its volume. The greater an object's mass, the more water it displaced in the graduated cylinder, thus the greater the volume.

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