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General Condition of Equilibrium

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-57

2025-11-02

461

So far we have considered only motion of translation, or motion in which all the parts of the moving body move in the same direction and with the same speed. But there may also be a motion of rotation, as when a body turns on an axis. In rotation, parts of the body on opposite sides of the axis move at any instant in opposite directions; and each part moves continuously in a curved path, with a speed that varies with its distance from the axis. In order to have complete equilibrium, not only must the resultant of all the forces tending to produce translation of the body be zero, but the resultant of all the forces tending to produce rotation must also be zero.