The Principle of Relativity (Classic Reprint) - Tapa blanda

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Excerpt from The Principle of Relativity

In the Newtonian description of the modes of motion of bodies however, absolute standards of position and direction are at the outset assumed, not as a philosophic doctrine, but as a means of co-ordinating the phenomena observed as simply as possible. The justification for the assumption lies in the fact that the co-ordination is possible, and the laws so framed con tain within themselves the definition of the terms 'absolute position' and 'direction,' and they also define, though not uniquely, 'the frame of reference.' A straight line from the point of view of Newtonian dynamics is nothing more than the path of a particle which moves under the influence of no external agencies or again it is the locus of the positions at any instant of a number of particles which were projected in a common direction with different velocities from a given point at some previous moment.

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