Submission Guidelines for 14th Biennial Conference of The
نویسندگان
چکیده
INTRODUCTION In volleyball, in order for a serve to be effective it must be difficult for the opposition to receive, and therefore pass to a teammate. This can be achieved by optimizing the parameters that limit the amount of time a receiver has to react to the ball or by executing a serve that has an unpredictable trajectory. A serve that meets both these criteria is the jump float serve, and when executed properly the ball will float through the air with an irregular flight path [1]. Traditionally this knuckle ball effect has been attributed to a phenomenon known as the drag crisis, a region defined by a sharp drop in the drag coefficient [2]. In volleyball, this occurs at speeds of roughly 14.5 m/s [1]. However, it’s been shown that the forces exerted on nonspinning volleyballs, which produce the irregular flight, fluctuate randomly by large magnitudes at velocities outside of the drag crisis region [3]. Nevertheless, the movement of a high speed float serve has not been quantified. Therefore the aim of this study was to quantify this random movement, determine the range of velocities it occurs in, and validate a 3D mathematical model used to simulate a jump float serve.
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