Meta-analiza naučnih radova o repulziji sportskih lopti u zavisnosti od pritiska unutar njih (Meta-Analyze of the Scientific Papers on the Sport Balls Repulsion Depending on the Air Pressure Within)

J. Anthr. Sport Phys. Educ. 3 (2019) 1: 55–57

3 Pages Posted: 22 Feb 2019

See all articles by Jovan Gardasevic

Jovan Gardasevic

University of Montenegro, Faculty for Sport and Physical Education

Date Written: January 27, 2019

Abstract

Bosnian Abstract: Glavni cilj istraživanja bio je da se napravi jedna Meta-analiza originalnih naučnih radova, koji su se bavili identifikacijom odbijanja sportskih lopti u zavisnosti od pritiska u njima. Sportske lopte standardnih dimenzija puštane su na ravnu čvrstu površinu sa visine od devet metara četiri puta. Prilikom prvog puštanja vazduh u sportskim loptama bio je pod propisanim pritiskom. Prilikom drugog puštanja pritisak u pumpanim sportskim loptama je smanjen za 5%, na trećem smanjen za dodatnih 5%, na četvrtom smanjen za još 5%. Postavka eksperimenta je sprovedena kinematografskim snimanjem slobodnog pada propisanih sportskih lopti i nizom skokova nakon odbijanja od čvrste podloge. Može se zaključiti da su pređena udaljenost i ukupno trajanje četiri uzastopna odskoka uglavnom zavisili od unutrašnjeg pritiska. U ovoj studiji, početna brzina sportske lopte bila je nepromenjena i promenjeni su samo unutrašnji pritisci. Utvrđeno je koliko se smanjuje visina odbijanja i trajanje odskoka, u zavisnosti od smanjenja unutrašnjeg pritiska. Ova meta-analiza pokazuje da se početna brzina lopte može povećati povećanjem unutrašnjeg pritiska u loptama.

English Abstract: The main goal of the research was to make one Meta-analyze of original scientific papers, who dealt with the identification on the sport balls repulsion depending on the pressure within. Sport balls of standard dimensions was released on the flat solid surface from the height of nine meters for four times. At the first release the air in the sport balls was under prescribed pressure. At the second release the pressure in the pumped sport balls is reduced by 5%, at the third reduced by an additional 5%, at the fourth reduced by another 5%. The setting of the experiment was carried by cinema shooting of free fall of the prescribed sport balls and a series of rebounds after the rejection of solid surfaces. One can conclude that the distance crossed and the total duration of four successive bouncing mostly dependent on inner pressure. In this study, the initial speed of a sport ball were unchanged and only inner pressures were changed. It was determined how much the height of the rebound is reduced and the duration of the rebound, respectively, depending on the reduction of inner pressure. This Meta- analyze shows that the initial speed of the ball can be increased by increasing the inner pressure in the balls.

Note: Downloadable document is in Bosnian.

Keywords: Meta-Analysis, Pressure in Sport Balls, Repulsion

Suggested Citation

Gardasevic, Jovan, Meta-analiza naučnih radova o repulziji sportskih lopti u zavisnosti od pritiska unutar njih (Meta-Analyze of the Scientific Papers on the Sport Balls Repulsion Depending on the Air Pressure Within) (January 27, 2019). J. Anthr. Sport Phys. Educ. 3 (2019) 1: 55–57. Available at SSRN: https://ssrn.com/abstract=3323956

Jovan Gardasevic (Contact Author)

University of Montenegro, Faculty for Sport and Physical Education ( email )

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Montenegro
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HOME PAGE: http://www.ucg.ac.me/sport

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