An analysis of the effects of augmented temperatures on aluminum baseball bats

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Schwartz, David Joseph
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Thesis (M.A.)
School of Physical Education
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The purpose of this study was to determine if augmented temperatures affect post-impact ball velocity on aluminum baseball bats. Two Louisville Slugger aluminum baseball bats, and 2 dozen NCAA-P practice baseballs were utilized. Balls were dropped from a height of approximately 2.4 meters so as to rebound off the center of percussion; the impact location was observed and if it was improper the trial was called invalid and a new one was attempted. Varying temperatures ranging from 9.72 to 37.39 degrees centigrade were used to determine if there was a deviation. Three trials were performed at each temperature and recorded. A Locam camera (200 fps) was utilized to film pre and post-impact velocities. The film was analyzed and the pre and post-impact velocities were recorded. An analysis of variance statistic with post hoc analysis was used to determine if a statistical difference existed between the velocities of the baseballs and the varying temperatures of aluminum bats. The data revealed there were no significant differences between the pre-impact velocities. The data went on to disclose the fact that there were not any significant differences in the post-impact velocities either. Through constructive manipulation of the data the researcher discovered the fact that with increased pre-impact velocities will come more distinct divisions in post-impact velocities. So as while there may not be a statistical difference in this experiment, the researcher is confident that in future studies of this nature there will be a design to securing the ever elusive statistical difference.