Study effect of coefficient of friction between feet and floor throwing circle throwing at achievement

Al-Khalidi, Mohammed

	Study effect of coefficient of friction between feet and floor throwing circle throwing at achievement
Sciences Journal Of Physical Education
Article 1, Volume 4, Issue 4, 2011, Pages 1-22
Author
Mohammed Al-Khalidi
Abstract
((Study effect of coefficient of friction between feet and floor throwing circle throwing at achievement . Researcher Dr. Mohammed Al-Khalidi,. The study included five sections: Part I consisted provided and the importance of research had been clarified the idea of the coefficients of friction and the friction force and effect according to ratios to accomplish Thrower with illustrate the importance of this study was to help create the laws of a mechanical nature of the ground the Department of throwing according to the specifications of law, while the problem of the research focused on the existence of circuits throw in the golf arena and the field in Iraq, particularly without any controls or the law and the question how, which negatively affects the completion of shooters as well as generating cases of injuries articular especially knee joint man of the left as a result of the high percentage of coefficient of friction between the submitted proposal and floor of the Department of shooting, or falling in cases of errors of law as a result of low coefficient of friction, while the objective of this research is to identify the percentage of coefficient of friction between the disc and throwing made the discus circle. Part II: a collection of theoretical studies related to the study, including some of the technical stages throw the disc, and the coefficient of friction, and friction force. Part III: Use the researchers descriptive approach suits the nature of the study, while the research sample was selected from a group of heroes of Iraq to the effectiveness of the discus, while in action research field will create a set of mixes concrete for the preparation of a number of circuits throw different surfaces in terms of the degree of roughness and smoothness then testing is conducted by the throw shooters to measure achievement on the various services and compare the result with the mechanical variables of the various departments to identify any combination of the Concrete convenient to throw the discus according to international standard, and then the results will be processed according to the laws of statistical convenience. Part IV: results will be displayed the discus and compare them with the research variables and mechanical analysis and discussion. Part V: containing a set of conclusions, including the coefficients of friction and ratios between feet and floor throwing circle throwing a big impact on the completion of throwing the discus, and a set of recommendations including the adoption of the results of this study in the number of circuits throw in Iraqi courts.

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