This is a significant part of what we cover in Animate Your Awareness Messages, a workshop where students create their own animated PSAs on topics of social concern.
Check it out at www.royerstudios.com/AYAM
Timing (how many frames it takes to cover a distance) and spacing (the change in position between frames) are two fundamental principles of the art of animation.
From the TED-Ed Lesson Animation basics: The art of timing and spacing - TED-Ed
Animation by TED-Ed