Here is a simple storyboard I drew up prior to creating my cannonball animation. Under each storyboard shot, I include a short description of what is happening. Creating these few storyboard shots made creating my animation much easier as I had much of the staging and animation ideas already fleshed out.

I used squash and stretch on the barrel of the cannon in my animation. As the cannon prepares to fire, it slowly squashes inward and quickly stretches outward as the cannon fires.

I used the arcs principle on the movement of the cannonball. The cannonball flies through the air in an arc pattern as as it bounces off the ground a few times, it also does so in arcs.

I used the staging principle two times in my animation. I staged the cannon on the left third of the shot at the beginning. After the camera finishes panning and following the cannonball, I position the brick wall it bounces off in the right third of the shot.