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actinic admit affinity amounts of matter appears apply assume assumption atomic masses atomic motion atomic weights attempt believe chemical elements chemistry chlorine comparison connection considered densities depends differential action earth's attractive force electricity elementary atoms enquiry equal masses equal unit volume equation of Newton's equivalence experiments fact force is propagated force of attraction gravitic force gravitic waves heterogeneous waves hydrogen infinitely inverse square involved kinds of matter known law of attraction law of gravitation law of universal light lithium atom magnet material homogeneity matter and force means of weight Nature Nature's law Newton's law Newtonian law number of units octaves of vibration particles of matter periodic motion phenomena physical science potassium atom present propagated by wave properties quantity of matter rates of motion recognised regards scientific specific heats suggest superposed waves supposed term third body tion unit masses units of mass universal attraction wave force wave motion
الصفحة 18 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.