Dynamics, Mechanics, Locomotion

While Mechanics studies Locomotion, i. e. movement between locations, Dynamics studies, primarily, localized motion, i. e. Repulsion and Attraction, at a single location.  Hence, insofar as Locomotion is independent of localized Repulsion and Attraction, Mechanics is independent of Dynamics.  However, the simplest human locomotion originates with a step, and a step begins as a pushing against a surface, i. e. as a localized repulsive force, and likewise for other modes of locomotion.  In other words, motion between locations is a special case of extending from a location.  Thus, Locomotion is a a mode of Repulsion, and, so, presents no exception to the classification of Mechanics as a branch of Dynamics.