[Profpat]

Originally Posted by dipayankar For that Prof, we need to define Gravitational force properly. is it a real force or a pseudo force?

A great question Dipayankar ( I've missed your penetrating question BTW )

I've seen it described both ways, i.e. as a force between two massive objects, but also ( which is more to my liking ) as an effect. This I vision, as the spatial warping, that large objects cause in the fabric of space.

What do you think?

Best to you,

Pat

P.S. Negative gravity, such as a quasar being spewed out by a black hole may be a force, due to negative pressure.