11. This is sometimes referred to as gravitational mass . 12. General relativity models gravity as a curvature within space-time that changes as a gravitational mass moves. 13. In that view, the ( outward ) motion is instead a consequence of its " gravitational mass ". 14. Tests of the weak equivalence principle are those that verify the equivalence of gravitational mass and inertial mass. 15. Suppose we have an object with inertial and gravitational masses " m " and " M ", respectively. 16. Measuring gravitational mass in terms of traditional mass units is simple in principle, but extremely difficult in practice. 17. :Start with inertia, and the idea of'gravitational mass 'versus'inertial mass'. talk ) 02 : 11, 31 December 2005 ( UTC) 18. In the theory of relativity, "'time dilation "'is a difference of elapsed time between two gravitational mass or masses. 19. Since inertial and gravitational masses are equivalent, gravitation should also be the result of observation from a Minkowski subspace. 20. :: What if it is accelerated to a relativistic speed-the inertial mass increases, but what about the gravitational mass ?
