Timing is one of the Twelve Principles of Animation, this principle focuses on making the objects within a animation appear to be following the rules of physics within our world or the ones that have been set up by the animator for the animation. This often done by the various drawings or Frames produced because it helps form the actual animation by creating a timeline or story when they are put together, this then helps create the physics of the actual animation and this in turn affects the objects, environment and the characters within the animation.
The perfect examples of this is the clip below:
I have chosen theses two clips for my research due to the fact that they display the principle timing perfectly due to the fact that they show the principle in the traditional way by using flip-book animation. Basically each page in the flip-book acts as a frame and therefore creates the physics of that world if there is enough of Frames allowing the short animation to come to life. The flip books both show this, now they may not be professional but they display the basics of Timing as well as Flip-book animation.
Here is a Professional Flip-book animation that is true to the Principle of Animation: