Squashed ans stretched (4rm 2D to 3D)

Squash and stretch is used in animation to give an animated object more reality. For instance, if you throw a light ball against a wall or on the ground, there is a sense of light weight, when you look at it, it feels like the ball squashes a little as it hits the floor and stretches very slightly as it heads up. When you try to animate the same scene (the light ball bouncing on the ground), to give the ball a sense of weight and a sense of impact, there is a need to squash it as it hits the ground and stretch it as it heads down or up.

Here is a test to show what I mean.

Squash and stretch could also be used for an exaggerating effect. (For instance to give a character a stronger expression)