• Hashem A. Kilani
Keywords: kinematic, long jumps


INTRODUCTION: The purpose of this study was to analyze the long jump event during the Amman School Championship, and to investigate which of the kinematics variables contributed to the distance achieved in the long jump, and to compare the actual distance (AD) achieved by the jumper and the qualified legal distance (LED) judged. METHODS: Fifteen jumpers from Amman Secondary School were filmed at the saggital plane during the execution of three trials of long jumping. A video Camera (Sony) was set at (50) HZ/ second and was perpendicular to the plane of motion. Data from the image of the (TV) were analyzed and the following kinematics variables were calculated: flying angle (FA), take of angle (TOA), landing angle (LA), the vertical flying velocity (VFV), the horizontal flying velocity (HFV), flying velocity (FV). height of the body center of gravity at take off (HCGTO) and at landing (HCGL), take off distance (TOD), flying distance (FD). Landing distance (LD) direct distance of the last three strides from the approach (DDLSS). The data were statistically analyzed using (SAS) packages, whereby the T test and stepwise regression were used. RESULTS: It was found that there were significant differences between the (LED) and the (AD) jumped for the (AD). The (TOA) contributed by 0.39, the (TOA) and (FV) contributed by 0.47, the (TOA) and (FV) and (HCGTO) contributed by 0.61 to the total distance jumped. CONCLUSIONS: It was concluded that the three variables that contributed most to the total distance matched those factors in the Newtonian low of projectiles. It is suggested, therefore, to concentrate on making the approach run accurate and to achieve the maximal velocity for optimizing the three kinematics variables at takeoff.