During high-speed dynamic processes, deformations and strains are not immediately transmitted to the whole body of the impacted object, e.g., a cylindric rod, once it is impacted at one end. Areas remote from the impact location remain undisturbed for a certain period of time. Deformations and strains are carried forward through the material in form of stress disturbances that propagate from the impact location through the body as wave phenomena at a finite velocity distinctive to the material. It is only gradually that the right-hand end of the rod begins to move. The delay can well be recognized in high-speed camera recordings.