摘要：The aim of this research is to determine the elastic (repulsive) properties of volleyball depending on the airpressure in it. Volleyball of standard dimensions was released on the flat solid surface from the height of ninemeters for four times. At the first release the air in the ball was under prescribed pressure. At the secondrelease the pressure in the pumped ball is reduced by 5%, at the third reduced by an additional 5%, at thefourth reduced by another 5%. The setting of the experiment was carried by cinema shooting of free fall ofthe prescribed volleyball and a series of rebounds after the rejection of solid surfaces. One can conclude thatthe distance crossed and the total duration of four successive bouncing mostly dependent on inner pressure.In this study, the initial speed of a volleyball was unchanged and only inner pressures were changed. It wasdetermined how much the height of the rebound is reduced and the duration of the rebound, respectively,depending on the reduction of inner pressure. Overall, it can be concluded that the initial speed of the ballcan be increased by increasing the inner pressure in the ball.
关键词：volleyball; pressure in volleyball; repulsion.
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