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Abstract

The skill of spike is accurate as the jump is faster, higher, and more convenient. This result cannot be obtained unless the player adjusts the starting steps and preparing to jump. The kinetic momentum that the player receives as a result of the starting steps (moves) is equal to the kinetic impulse of the player according to the law kinetic momentum. As we see during the game. Part of the player perform the skill of spike with one step than jump and there are some players perform the spike with two or three steps depending on the distance and the height of the ball. The aim of the research is to compare between the first step, second and third steps of the Approach stage in some biomechanical variables in the performance of the skill of spike, Ten players representing the university's volleyball team were selected, The researcher used the coefficient of variation of the physical variables range between(6.2-8.8%), The analysis was performed by means of a special device (jump mat) number (2) with dimensions(50 x 110 cm)The device measures the kinetic variables during the performance directly by connecting the device with the computer using a cable. The researcher reached several conclusions: The speed of the player during the last touch of the ground and jump produces a large explosive force and finally the distance of the jump is bigger. And the sports which are performed by beatings are less accurate compared to the ones performed with throwing.