September 26, 2016
Comparative physics, law of gravity, improved law of gravity, general relativity, same point, different point, principle of conservation of energy
As No.1 of comparative physics series papers, this paper discusses the same points of law of gravity (including improved law of gravity) and general relativity: they are all the effective theories of gravitational interaction, and can be used to solve the problems of advance of planetary perihelion and deflection of photon around the Sun; and the different points of them: general relativity can conform to general relativity principle while law of gravity cannot conform to this principle, and law of gravity can solve the constraint problems in gravitational field (such as a small ball rolls along the inclined plane) while general relativity cannot solve these problems. These two theories can also overcome their own weak points by learning from each other's strong points, and jointly present the new explanation that the advance of planetary perihelion is the combined result of two motions: the first elliptical motion decided by law of gravity creates the perihelion, and the second vortex motion creates the advance of perihelion in which the advance parameters can be decided by general relativity. The common defect of these two theories is that they cannot take into account the principle of conservation of energy, comparing with the result that applying the principle of conservation of energy to derive Newton's second law and law of gravity, the further topic is applying the principle of conservation of energy to derive the related formulae and equations of general relativity.