تدريبات وفق التغير بقوى الاحتكاك على سطوح مختلفة في تطوير الخطوات الأخيرة و الانطلاق لبعض حركات القفز العمودي للشباب

Adopt some of the games in the motor performance of jumping skill to achieve the highest levels on the physical attributes and the degree of integration between them and in particular workouts relevant internal force, which require the use of resistors are added to the bod.' as the use of devices Mohgm that affect the development of private power players. It is these forces is the force of friction, which represents the force between two surfaces where these forces depend on the area AJmtlamsh surfaces that define the required pressure that forces his player. So lies the importance of conducting this research to help determine the relationship between friction and Ngarkoy according to the nature of the surfaces in the training to influence the final effective steps to approach and improve the skills of jumping to perform multiple Kakxhb beating crushing game of volleyball and high jump The research sample was selected players from the landslide Kit the ball and players higher plane young players from the clubs of Karbala and the number (8) players Reconstruction 18-19. Was applied exercises to jump varied on different surfaces (Kairmal ar