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according action activity actual amount amount of energy angle appear becomes body Book cause centre comet component concerned conservation considered constant continually dark definite developed direction distance earth effect energy entirely equal equation evidence exertion existence explain fact finite force further given globe gravitation greater heat increase inertia infer intensity Jupiter kinetic larger least less light limit magnitude mass matter mean measure microf molar molecular moon motion moving mystery nature nebula observed once orbit original overcome perihelion period phenomena physical physicists planets position possesses possible present principle produce Professor proportional proposition proved quantity question reader reason reference remark represent resistance respect rest resulting rotation Sect seems solar space spent stars statement substance supposed surface temperature term theory things tion true truth unit universe velocity whole
Page 26 - The total energy of any body or system of bodies is a quantity which can neither be increased nor diminished by any mutual action of such bodies, though it may be transformed into any one of the forms of which energy is susceptible.
Page 134 - ... forces describes the diagonal of a parallelogram, in the same time that it would the sides with separate.
Page 90 - Matter has an innate power of resisting external influences, so that every body, as far as it can, remains at rest or moves uniformly in a straight line.
Page 329 - ... could not differ from 71° Fahr, by more than a single degree. Now, from the Bible we learn that both plants were simultaneously cultivated in the central valleys of Palestine, in the time of Moses, and its then temperature is thus definitively determined.
Page 80 - This force consists in the action only and remains no longer in the body when the action is over. For a body maintains every new state it acquires, by its inertia only. Impressed forces are of different origins, as from percussion, from pressure, from centripetal force.
Page 89 - The vis insita, or innate force of matter, is a power of resisting, by which every body, as much as in it lies, continues in its present state, whether it be of rest, or of moving uniformly forwards in a right line.
Page 26 - In any system of bodies whatever, to which no energy is communicated by external bodies, and which parts with no energy to external bodies, the sum of the various potential and kinetic energies remains for ever unaltered.
Page 51 - Even water, which is a very good lubricant, is not entirely free from friction, and so our present oceanic tides must be influenced by fluid friction, although to a far less extent than the molten solid just referred to. Now all moving systems which are subject to friction gradually come to rest. A train will run a long way when the steam is turned off, but it stops at last, and a fly-wheel will continue to spin for only a limited time.