Newton's Principia, sections I, II, III, with notes and illustrations. Also a collection of problems (1863)
Newton, Isaac, Sir, 1642-1727, Frost, Percival, 1817-1898 · Cambridge, London, Macmillan and Co · leaf 187
ions. 1. Two e^z^a? nwj7* P> Q *?w?e on a string which passes roundtwo fixed pegs A, B in a smooth horizontal plane ; the rings arebrought together, and then projected icith equal velocities, so as tokeep the string stretched symmetrically. Shew that the tension ofthe string varies inversely as… … a therefore DE is fixed, and P moves in a parabola whose focusis A, and directrix DE. Also, the tensions of the string in PA, PQ being equal andequally inclined to the tangent to Ps path, the resultant of thesetensions, which are the only forces acting in the plane of thecurve, acts in the normal,…
Mechanics · Celestial mechanics
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