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Figure 7. Relation between offset distance (vertical) and ball velocity (a). relation between offset distance (vertical) and shot angle (b).
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The purpose of this study was to clarify the relation between the stress distribution, the deformation and the impact point on the foot using a high-speed camera system and a finite element method. In the computer simulation using the finite element leg model, it was found that the offset distance affects ball spin more than the coefficient of friction. It is suggested that the optimum offset distance is related to a trade-off between ball rotation and ball speed. In the computer simulation using the finite element skeletal foot model, energy dispersion of the foot for the lower impact case is greater than that for the higher impact case. The maximum shot angle was 16 degrees for the offset distance of −20 mm. It seems that the shooting angle was influenced by the location and the deformation of the foot complex and the ball

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