Dynamic Analysis of Weight Bounce in one or two Mass during the Lift

. . " :1. 35 15 + 20 2. 80 30 + 50 35 1.3 % . 80 2.3 % . The imbalance during lift creates two opposite cases: the first is positive utilizes the imbalance of movement direction to accelerate movement of weight, lessen the effort while the second is negative increase the burden on the participating muscular groups involved in lift due to the fact its working against Movement direction.High percentage of failure of Olympic lifts is attributed to absence of utilizing the imbalance of weight, thus comes the importance of this research.The research includes a full scale athletical analysis to find the natural free frequency of one and two masses with the same value in one side of bar in addition to calculate motional energy while lifting one or two mass. The following weights were chosen.1. 35 kgm solid and 15+20 Kgm on two phases2. 80 kgm solid and 30+50 Kgm on two massesThe study showed that the player can utilize motional energy of multiple mass more than one specially if the weight was more than 35 Kgm resulting in increase of 1.3% of motional energy.While when increasing the weight up to 80 Kgm, the in crease reaches 2.3% which mean we can train weight lifter to increase weight and divide it on two to utilize in lifting process for adapting to benefit from imbalance of motional energy of weight bar by increasing the weight and masses which affects on the accordance of imbalance of weight and the moment of burst (capacity) resulting in the necessity of weight lifter to be familiar with different timings of weight lifting (upper deformation) to and this case before the weight in back to deformation mood downwards.