1. Evaluate a number of kinematic and kinematic variables for the last step of the skill of smashing serve in volleyball for the sample

2. The relationship between the values of a number of kinematic and kinetic variables for the last step of the skill of the aces in volleyball for the sample.

The human field consisted of a number of members of the University of Mosul volleyball team for the academic year 2020/2021 with (6) students who were chosen by the intentional method. A (canon) camera with (60) frames per second was used the height of the lens (1.40 m) from ground level and the distance of the camera from the player was (5) meters as it was perpendicular to the field of movement on the right side of the player to study the kinematic variables, as well as the use of a force measurement platform the pivot reaction is a function (force - time) measuring (1 m x 1.20 m) and placing it at the last step of the sending player, which reflects the force applied to the device Equipped with a data reader connected to a computer (laptop) to convert the readings of the function into graphic forms to facilitate highlighting its kinetic variables, as the platform was placed in one of the sides of the volleyball court by placing wooden staves with a length of (3) meters, including the platform and covered with a piece of tartan with the same length of movement, so that the player would stand on top of the skates when he was serving for the hitter. The study used several programs, each according to its function, to reach the research results, such as (Kenova), (ACDSee 10 Photo Manager) and (Microsoft Office Excel 2010 and (paint)). To reach the results, the researcher used the statistical bag. (SPSS) to extract the arithmetic mean, standard deviation, the Pearson simple correlation coefficient, and the coefficient of variation %.

The researcher concluded: The values of the variables under study achieved significant positive and negative correlations between the kinematic and kinetic variables by 39.29% in general. The short time and length of the last step have a very important role in preparing and preparing for the process of getting up and lifting the body up quickly and optimally The variables of the angle of rise and the angular velocity of the body between the moment of impact and the push, and the highest height of center of gravity of body mass Getting up with the whole foot is best to reach the highest height of the body in the air and take advantage of the force of the reaction of the ground and bending in the knee joint in terms of recording the maximum force recorded by collision and pushing and prolonging the time taken to reach the maximum force.