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Abstract
This introductory chapter tries to explain what we are going to do, what do notions such as fluid and a model of a physical phenomenon mean, what for, such models are developed, and what features of a phenomenon a model should be necessarily able to describe and so on.
Keywords:
Body, Body configuration, Coordinate basis, Event, Fluid, Force, Frame of reference, Mass, Model, Motion, Place, Space-time continuum, System of coordinates, Trajectory, World-line.