The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 47
What is the centre of gravity fWhen are the centres of magnitude and gravity in the same spot? 133. What isthe centre of motion ? Is the centre of motion supposed to be at rest, or does itmove ? To what do the terms centre of motion and axis of motion relate? 134.What parts of a body move with the… … MECHANICS. 37 135. Motion, either in a circle or ellipsis, or anyother curve line, must be the result of the action of twoforces ; for, the impulse of one single force always pro-duces motion in a right or straight line. 136. A ball thrown in a horizontal direction is al-ways influenced by three…
Physics
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