Pendulum animation

This is an animation technique called pendulum which an illustrated animation which is drawn in steps, similar to squash and stretch. This technique involves a lot of precise/accurate measurement. unfortunately I am not able to upload my animated gif due to file size complications. To the left is so examples of what "pendulum" is about, the main principle of Pendulum is that the steps of the animation are marked out from 1 to 12 and is a former animated sequence to a ball swinging back and forth. my animation had a sequence of 24 frames because it involve 12 steps of swinging forward and 12 for swinging and backwards, the rule was the further you draw the frames of the ball apart the faster it swings, the closer the balls were drawn the slower the movements.