David Malouf wrote an excellent piece exploring how motion design relates to interaction design.
“Whether it is the original flick-scroll that Apple designed with the launch of the iPhone, or the spring-refresh, or the swipe-dismiss there is a commonality for how the gestures are engaged. The movements share a lack of control and/or precision. This has as much to do with the size of the targets as it does with the complete lack of target for ending. These free-ending gestures work because of their ease, but also because of the extended range of motion creates an aesthetic quality to them that more precise and controlled gestures do not. In turn they add to the overall aesthetic quality of the interface around feelings of play & personal satisfaction.”
Link: Motion and The Clay of Interaction Design (johnnyholland.org)