If you are asking about gravitational force, it can be determined by the temporal change in the gravitational potential with distance. In reality, GR is an energy theory - so the force created by the g field of a mass at a distance r will also be the same as the force created by the change in the energy state with distance from the mass. One normally thinks in terms of force as rate of change of momentum (d/dt)(mv) —-> (F = ma) if mass is constant,. Bur force is also rate of change of energy wrt space,
F = (d/ds)(E) = dE/dS.
In General Relativity, it is the change in energy GM/d which corresponds to the time dilation escape velocity energy that determines the acceleration factor that would traditionally be calculated directly from Newton’s law. Calculating acceleration from spatial rate of change in energy or temporal rate of change in velocity,0 are two sides of the same coin. Both solutions stem from the effect of mass upon space.
Explanation:
There are following some formula to find force without mass
1- Force=Density . Volume . Acceleration
2- Force= (Momentum . Acceleration) / Volume
3- Force= work / Displacement
4- Force=( Power . Time) / Displacement
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