Question

why is gravitational force only attractive force ?? why cant it be repulsive ?

Answer 1

Newton's law for universal gravitation describes the force of gravity as F(g) = G(M*m)/(r^2)

M and m are always positive. Therefore, the force of gravity is always an attractive force.

otherwise, even the smartest physicists today still don't fully understand why gravitation works only that way.

Answer 2

or else it can be explained that gravitation is result of space-time curve due to mass exhibited by the entity ... hence since only a depression effect is observed of mass on space-time curve ...it is attractive...

Answer 3

...to conform to experiment (reality). Negative mass is not observed.

Answer 4

Because mass is always positive.

F=GMm/R^2 ; G is a constant, M and m are both masses which are positive, and "R" the distance of seperation is also always positive.

Hence since all terms are always positive, the force is attractive.(I aM noT sUre)

Answer 5

we can take r as displacement and then calculate so being a vector it can be negative cant it ?