A RESEARCH ON EFFECT OF AUGMENT OF TABLE TENNIS BALL'S RADIUS IN ITS MOVING PROCESS

Abstract

INTRODUCTION AND PURPOSE At present, the radius of the table tennis ball commonly used in matches of world table tennis circles is 19 mm. The speed and the attacking and defending rhythm of this kind of ball are very fast, and each ball's round times are so few that it is not suitable to view and admire. The radius of table tennis balls in matches soon will be increased to 20 mm by the International Table Tennis Association in order to attract audience and enhance the excitement of matches. METHODS In this paper, with high speed film measurement, the spinning speed, angular momentum, moving speed on these two kinds of balls, under several conditions with same initial situation, were compared and analyzed. RESULTS By computerized film analyzing and combined with hydra mechanics theory, the results showed that the ratting, speed, and motion tracks of the ball changed because of the addition to the ball's radius. A quantitative analysis was also made in this paper. This study was of active significance in the development of techniques and tactics in table tennis.