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action and reaction analysis angle of approximately angle of take-off angular velocity ankles plantar flex arms move arms overhead assuming the swan back and front back jackknife dive backward dives belt board as potential board is depressed body position body rotated body will rotate carry the diver center of gravity chest circumduct depress the board dive See Chart diver leaves dynamics of diving extend to further falling body Figure 2 Plate force forefingers touching forward dives front jackknife dives frontal plane greatest height hurdle inches jackknife position kinetic energy law of action leaves the board literature lower extremities lower limbs Mann 22 mechanical laws motion pictures movement ninety degrees observation of motion parabolic curve physical education pictures the writer plantar flexion Plate VIII potential energy shown in Plate somersault spine straightening study of motion suspended body swan dive swan position thumbs locked toes pointed transverse plane University of Wisconsin vertical