From the course: Animation Foundations: Fundamentals
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Squash and stretch
Many things in nature are not rigid and have some degree of flexibility. This means that not all parts of an object will move at once. Take for example a simple balloon. When the balloon hits the wall, the front part of it stops, but the back end keeps going and runs into the mass in front of it, causing the object to squash. Stretch is simply the opposite of squash. If we pull the object, the front moves first and the rest follows along later. This is very similar to overlap and follow through, but within the object itself. Squash and stretch can be used to add life to animation. When a flexible object changes direction, accelerates or deccelerates, the mass of the object will respond first at the point where the force is applied. The rest of the mass will follow later. When animating squash and stretch in a computer, there are many ways to get this effect. The simplest way is to simply scale the object. When an object squashes, you scale it down along the direction of the force…
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