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Chang Grace Chong
wen sheng ming
Purpose: This dissertation discusses differences between the conventional volleyball and the newly designed one. Several goals have been proposed at this research. The first is, flight paths influenced by different texture of the balls at the same space. The second is the difference of frictional coefficient between various textures. The third is the difference of collision coefficient between various textures. Approach: Flight path is processed by using dual track volleyball serve machine to serve the ball and recording the process, and using “tracker” to do analysis. Frictional coefficient is measured by the means of pressure gauge, which is used to fix the ball and to add some weight on the ball. Collision coefficient is analyzed by falling the ball from 80-cm place and using “tracker” to analyze the video, which is recorded by 2D high speed camera.Result: Flight path is 362cm and 333cm, frictional coefficient is 0.846 and 0.841, and collision coefficient is 0.778 and 0.789, in correspondence to the newly designed volleyball and the conventional one. Conclusion: Time when the ball flies to the highest altitude would be varied by the different textures. The newly designed ball flies to the highest altitude faster the conventional one. The newly designed ball has bigger frictional, since it has 2mm hole spread on the surface. Collision is not so different. Keywords: Sphere, Flight path, Frictional coefficient, Collision coefficient
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