Examples_20of_20Term_20Project_20-1

Examples_20of_20Term_20Project_20-1 - IMPACT OF COMPOSITION...

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Unformatted text preview: IMPACT OF COMPOSITION ON BOUNCING POLYMER BALLS by A Term Project For EMA 6808, Error Analysis, Organization, and Statistical Experimental Design in Materials Research Department of Materials Science and Engineering University of Florida Dr. Singh August 2009 ii ABSTRACT Researcher: ??????? Title: Impact of Composition on Bouncing Polymer Balls Institution: University of Florida Department: Materials Science and Engineering Year: 2009 This paper will examine the impact that composition has on the bouncing properties of polymer balls. iii TABLE OF CONTENTS Page ABSTRACT ii Chapter I Recognition & Statement of the Problem 1 II Choice of Factors, Levels, & Ranges 5 III Selection of The Response Variable(s) 9 IV Choice of Design 10 V Conducting the Experiment 12 VI Statistical Analysis 18 VII Drawing Conclusions, Recommendations 28 REFERENCES 32 APPENDIXES A BIBLIOGRAPHY 33 1 CHAPTER I Recognition & Statement of the Problem Introduction People and mostly children in particular, have for centuries played with balls, spheres that roll and tumble on the ground. However, it has only been recently that the bouncing ball has come into focus as an essential plaything in children’s toy boxes. Mass marketed in the 60’s b y the Wham-O Manufacturing Company, the original Super Ball was the brainchild of a chemist named Norman Stingley. Like most innovative products, this new toy came about by accident. Originally, an employee at Bettis Rubber Company in California, Stingley played around with scraps of rubber during his spare time. He took the scraps of these synthetic materials, compressed them under 3,500 pounds of pressure per square inch, and discovered that this created a material with unprecedented resilience. The Bettis Rubber Company was uninterested in Stingley’s invention, but the Super Ball found a home at Wham-O and became a hit, selling more than seven million of these bouncing balls in less than six months (Super Ball, n.d.). Almost half a century later, the Super Ball fad has faded quite a bit, but everyone has experienced the 2 mystique of this highly bounceable ball. Still, few people understand the exact physics and chemistry behind the bouncing ball and this is where our experiment comes into play. Experiment and Hypotheses The original Wham-O Super Ball was made from Stingley’s proprietary material Zectron, which was nothing more than polybutadiene with a small amount of sulfur to reinforce the material and serve as a vulcanizing agent. The ball was molded at a temperature of 320 degrees Fahrenheit with 1000 psi of pressure (Super Ball, n.d.). For the purpose of this experiment, our polymer balls will be made from the following materials: Borax White school glue Cornstarch Food coloring Warm water The glue contains the polymer polyvinyl acetate (PVA), which cross-links to itself when reacted with borax. The procedures for making the polymer ball are as follows: 1. Label one cup “Borax Solution” and the other cup “Ball Mixture.”“Ball Mixture....
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This note was uploaded on 02/02/2012 for the course EMA 3800 taught by Professor El-shall during the Spring '10 term at University of Florida.

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Examples_20of_20Term_20Project_20-1 - IMPACT OF COMPOSITION...

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