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The paper aims to answer to the question whether the spatial impact between a free falling ball and the frontal surface of a rotating disc around a vertical axis, on one side, and the impact between the same ball and an inclined fix plane can be considered equivalent. An affirmative response to this problem would allow assimilating the disc-ball impact to a plane impact and the possibility of applying a simpler study method. The first part of the work presents the equivalence conditions and the comparison between plastic imprints of the ball obtained in the two cases are presented. Keywords—impact, Coulomb friction, plastic indentation

EQUIVALENCE BETWEEN BALL-ROTATING DISC IMPACT AND BALL-INCLINED PLANE IMPACT, PART I - EQUIVALENCE CONSTRAINTS, PLASTIC IMPRINTS COMPARISON