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 157
est and the velocity of P will be the velocityrelative to <r. Take PQ and <T<T, which are described in thesame time, to represent the velocities of P and <r, and let Qq beequal and parallel to crcr, then Pq represents the velocity of Prelative to cr: and, since Qq = So- — cr<r = PP,… … angle SBC be greater than the triangle SAB, the impulse at Bis not in the direction US, but BU, parallel to cC, that is, if theareas are not proportional to the times but are in an increasingratio, the direction of the force deviates towards the direction inwhich the description of areas is…
Mechanics · Celestial mechanics
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