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

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

3. 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

4. Predicted Graph

5. 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.

6. 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

7. Graph of Mass vs. Volume

8. 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 

9. 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. 

10. 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.