Squash and Stretch
Squash and stretch is the exaggeration of a non-rigid body's deformation as it moves. In general, squash is used to show force of impact or anticipation, while stretch indicates acceleration or velocity. For example, a falling rubber ball may begin to elongate as it speeds up. It will then squash when it hits the ground, its speed on impact determining how extreme the deformation is. When leaving the ground from its bounce, the ball will be temporarily stretched again before gravity slows it down.