First tutorial - bouncing ball

Example frame from the first tutorial - where the spacing is close together, the ball is travelling slower, where it's further apart, the ball is travelling faster. It's important to make sure this speeding up / slowing down happens in the right place to make the bounce look as realistic as possible. Animation is about faking real life - making it look like a flat 2D ball has real weight and force behind it. Timing is really important for this. The small amount of squash and stretch also helps to give the ball a sense of real weight and force.