© 1997 by ASME.The nature of impact response of a exible body is stud- ied. The key parameters which govern the nature of impact response are identi ed. The eects of these parameters on the impact response are examined through numerical sim- ulations. It is shown that the normalized impact force and the type of impact response can be predicted through the functional relationship between the normalized maximum impact force and two nondimensional parameters termed as \loss factor and \relative stiness. It is expected that the results of this study will be of great value in choos- ing adequate impact and computational models for the dy- namic analysis of multibody systems subject to transverse impacts.