حقل جاذبية: الفرق بين النسختين

: ''t'' is [[الزمن]],

:''G'' [[ثابت الجاذبية]],

 

This includes [[Newton's law of gravitation]], and the relation between gravitational potential and field acceleration. Note that d²'''R'''/d''t''² and '''F'''/''m'' are both equal to the [[gravitational acceleration]] '''g''' (equivalent to the inertial acceleration, so same mathematical form, but also defined as gravitational force per unit mass<ref>Essential Principles of Physics, P.M. Whelan, M.J. Hodgeson, 2nd Edition, 1978, John Murray, ISBN 0-7195-3382-1</ref>). The negative signs are inserted since the force acts antiparallel to the displacement. The equivalent field equation in terms of mass [[density]] ''ρ'' of the attracting mass are: