Group Name: Blue Group Members: Olga Drogomiretskiy, Ingrid Lee, Asch Warner, Katie Thompson, Rajesh Awal, Drew Barnett 9/29/11

 What is the relation between mass and volume for various objects chosen from a physics laboratory bin?

 Density Equation  When the mass of an object increases, the volume should also increase proportionately  There should be a linear relationship between the mass and volume of objects with the same densities

ItemMass (g) Volume (cm^3) Density (g/cm^3) Table and graph that illustrate the linear relationship between the mass and volume in this experiment

 Obtain all needed materials  Measure and record the mass of each of the metal objects using the electronic scale  Fill a 250mL graduated cylinder with150 mL water  Drop one object into the graduated cylinder, and record the water displacement  Repeat steps 3-4 for each remaining object  Calculate and record the densities of each object

 Large cylinder: shiny silver color with tube-like shape  Small cylinder: shorter than large cylinder with same shape and shiny silver color  Thin cylinder: long skinny cylinder with shiny silver color  Rect. cube: rectangular shaped cube, shiny silver color

ItemMass (g)Volume ()Density () Large cylinder Small cylinder Thin cylinder Rect. cube

Graph 1: Mass vs. Volume with all four objects including outlier

Graph 2: Mass vs. Volume for three objects excluding outlier

 Three of the objects (the large cylinder, the small cylinder, and the rect. cube) had very similar densities of approx 3  In the second graph, the three data points that have similar density all fall on the same trend line and have the same slope of 2.9  All three objects with similar densities, the mass increased proportionately to the increase in volume, proving our theory correct  The data point excluded from the second graph was the thin cylinder object. Having a density of 8 with a higher density than the other three, this data point was not included in the best fit line and marked as outlier  The outlier does not conflict with our theory because its density did not correspond to the other measured objects

 The measurements of four objects were recorded and three of them had the same density.  Graphing these three indicated a linear relationship between mass and volume; thus, proving our hypothesis correct.  The equation for the best fit line was y = x , indicating that the slope, as density, is about 2.9.  With the fourth data point seen as an outlier, the average density is the same number.