Tennis racket stiffness, string tension and impact velocity effects on post-impact ball angular velocity

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Show simple item record Bower, Robert en_US Sinclair, Peter en_US 2009-12-21T02:33:46Z 2009-12-21T02:33:46Z 2007 en_US
dc.identifier 2006013596 en_US
dc.identifier.citation Bower Robert and Sinclair Peter 2007, 'Tennis racket stiffness, string tension and impact velocity effects on post-impact ball angular velocity', Blackwell Publishing Ltd, vol. 10, pp. 111-122. en_US
dc.identifier.issn 1369-7072 en_US
dc.identifier.other C1 en_US
dc.description.abstract There has been significant technological advancement in the game of tennis over the past two decades. In particular, tennis rackets have changed in size, shape and material composition. The effects of these changes on ball rebound speed have been well documented, but few studies have considered the effects on ball angular velocity. The purpose of this study was to investigate the effects of three factors on post-impact ball spin. Tennis balls were projected at three velocities toward a clamped racket simulating three levels of stiffness and strung at three string tensions. The angular velocity of each tennis ball was measured from stroboscopic images during an oblique impact with the racket. A three-way factorial ANOVA revealed significant (P < 0.01) differences in the post-impact angular velocity for string tension, racket stiffness and impact velocity, as well as two-way interactions between string tension and impact velocity, and between racket stiffness and impact velocity. The possibility of tangential elastic strain energy being stored in the racket and ball was evident in low impact velocity trials. These displayed a postimpact angular velocity where the circumference of the ball was translating faster than the relative velocity between the ball s centre of mass and the string surface. It was concluded that increasing the relative impact velocity between the racket and ball was the best means of increasing the post-impact angular velocity of the tennis ball. en_US
dc.publisher Blackwell Publishing Ltd en_US
dc.relation.isbasedon en_US
dc.title Tennis racket stiffness, string tension and impact velocity effects on post-impact ball angular velocity en_US
dc.parent Sports Engineering en_US
dc.journal.volume 10 en_US
dc.journal.number en_US
dc.publocation Oxford, UK en_US
dc.identifier.startpage 111 en_US
dc.identifier.endpage 122 en_US BUS.School of Leisure, Sport and Tourism en_US
dc.conference Verified OK en_US
dc.for 110600 en_US
dc.personcode 940018 en_US
dc.personcode 0000034407 en_US
dc.percentage 50 en_US Human Movement and Sports Science en_US
dc.classification.type FOR-08 en_US
dc.description.keywords apparent coefficient of restitution, elastic strain energy, oblique impact, spin en_US

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