The Kinematical Analysis of New Material Plastic ball

• Main Authors: Cheng-Yu,Su, 蘇政瑜
• Other Authors: Chien-Lu,Tsai
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/69346704400328434318

碩士 === 國立臺灣師範大學 === 體育學系 === 103 === Abstract The piastic balls will be used in July 2014,The new balls will differ from the present balls used,because they are made of plastic instead of celluloid.So far,there is no study about the new plastic balls in Taiwan. The purpose of this study was to analysis the difference between the new plastic balls and the celluloid balls in coefficient of restitution,spin and speed.It offer players and coaches the informations to adapt to the change.The high-speed camera(1000Hz) was used to capture the movements of the three experiments Kwon3D Motion analysis software was used to analyze the data. Mann-Whitney U test(α = .05) and Repeated-measures One-way ANOVA(α = .05) were applied to assess the differences.The result indicated that:(1)In the tabletennis robot’s experiment,the spins in topspin have significant decrease with the plastic ball compared to celluloid ball. (2)In the free fall experiment,the coefficient of restitution has significant increase with the plastic ball compared to celluloid ball .(3)In the elite player’s experiment, the speeds in forehand drive against an srriving backspin, forehand drive against an arriving topspin and forehand topspin serve have significant decrease with the plastic ball compared to celluloid ball,and the spins in forehand backspin serve and forehand topspin serve have significant decrease with the plastic ball compared to celluloid ball.This study concludes that there actually have differences between the new plastic balls and the celluloid balls.The results of this study could be considered as a reference in the field of tabletennis.