 If the change in force is slow, the jerk is small, and the propagation of deformation is considered instantaneous as compared to the change in acceleration.The distorted body acts as if it were in a quasi-static regime, and only a changing force (non-zero jerk) can cause propagation of mechanical waves (or electromagnetic waves for a charged particle); therefore, for nonzero-to-high jerk, a shock wave and its propagation through the body should be considered.The propagation of deformation is shown in the graphic "Compression wave patterns" as a compressional plane wave through an elastically deformable material.