A three-dimensional study of the momentum parts of the body when performing the backstroke (straight - diagonal) in tennis

Abstract

The resultant momentum is the amount of continuity, and it is a compound of three directions of different speeds (front-back, right-left, and up-down) multiplied by the mass of these parts. The three-dimensional motion analysis program (APAS) was used. The purpose of the research is to identify the values of the resultant momentum of body parts when performing the two types of backhand strokes (straight - diagonal) in tennis and to compare them. The research sample consisted of (12 views) adopted from two players representing the Iraqi national team. The test and photography were conducted on the tennis court at the College of Physical Education at the Technical University. We found that the hand has more momentum in the diagonal backhand stroke compared to the straight backhand stroke due to the length of the hand's path. The thigh will bend forward more in the straight backhand stroke, but in the diagonal backhand stroke, it will remain fixed because the support will be on it and its anatomical position does not allow it to bend forward.