Squash and Stretch
This is an example of the animation principle squash and stretch. Notice how as the ball hits the ground it flattens out and rebounds into the air.
This is an example of the animation principle solid drawing. As the sun moves across the sky the shading on the ball follows the suns path giving the appearance that it is 3D.
Arc and Easing
This is an example of Arc and Easing. Notice how the ball falls in an arc not straight to the point of contact, then slows down as it leaves the frame.
This is an example of anticipation. The Catapult has to be pulled back in order for it to fire. The ball must flatten out to give it the jump height.
Straight Ahead and Pose to Pose
This animation technique requires you to re draw the images on after another over and over again.