On the Rebound Which Follows the Percussion of Bodies

Abstract

Some people think that the rebound which we observe is different from the movement of incidence of the same body. Some rebounds occur along the same straight line of incidence when this is perpendicular to the underlying plane which prevents its continuation. In such a case, the starting and the arriving points of the movement which they think must be distinct and opposite, are united in one and the same movement at the same point of incidence. These people also think that the first movement of incidence is completely annihilated by the resistance and firmness of the underlying plane and that afterwards an opposite movement of rebound is created anew.