Peter+G13

=**A STUDY OF HOW HIGH A REGULAR TENNIS BALL, GREEN DOT TENNIS BALL, AND ORANGE QUICK START TENNIS BALL CAN BOUNCE **= =Peter G. = =2012-2013 = =**ABSTRACT **= =The purpose of this study was to determine how high a regular tennis ball, a green dot ball, and an orange quick start ball can bounce with different variables. A tennis ball is made out of a rubber sheet that turns into half of a ball from a machine; then another half ball is glued to the other half ball to make a whole rubber ball; then a felt mat is applied to the outside of the whole ball to make it fuzzy. A regular ball was put into a freezer for different amounts of time; after the ball was pulled out of the freezer for each time, the ball was bounced; this was done three times for each amount of time and the height that the ball bounced was measured then recorded. It was determined that the longer the ball was in the freezer the less the ball bounced after it was taken out. The results were this way because when the air outside the ball lowers so does the pressure inside, so when the pressure goes down the ball gets softer and starts to bounce less. =

=**EXPERIMENTAL IMPROVEMENTS AND FUTURE EXPERIMENTS **= =An improvement to this experiment would be to use a volunteer when measuring the height that the ball bounced. This would be helpful because then I wouldn't drop the ball then bend down and measure it. Also I could get a more exact anwser by having a volunteer because they would already be bent down and ready to calculate the exact height. In the future, it would be interesting to determine if the regular tennis ball would bounce higher than one of those really big tennis balls that are in tennis stores; it would be interesting to determine because since the bigger ball has more mass it probably has more air pressure inside, causing it to bounce higher. = = = = =