Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 24
ders werelying upon the table, since in both cases a straight line con- RELATIVE MOTION. 7 necting the points a b, a b, etc., changes neither in length norin direction. A point may be at the same instant at rest with referenceto certain points, and in motion with reference to certain otherpoints.… … When a particle is spoken of as being in motion or at rest, somepoint is always expressed or understood, relatively to which thechange or permanence of position is maintained. All motions withwhich we have to do, or which we can measure, are relative. Changeof position with reference to a fixed…
Physics
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