MOTION Index

Concepts of motion are formed by specifying the distinctive nature of the motion and of the entities performing it, and/or of the medium in which it is performed-and omitting the particular measurements of any given instance of such motion and of the entities involved. For instance, the concept "walking" denotes a certain kind of motion performed by living entities possessing legs, and does not apply to the motion of a snake or of an automobile. The concept "swimming" denotes the motion of any living entity propelling itself through water, and does not apply to the motion of a boat. The concept "flying" denotes the motion of any entity propelling itself through the air, whether a bird or an airplane.