It has all the properties of a force.
If you choose a different definition then you get a different answer.
Remember that every theory is flawed. They are only as good as the predictions they make.
The idea that gravity is a force is extremely useful and makes many valid predictions.
Ask an engineer about the FORCES needed to keep a bridge up.
They are not going to throw their hands up in horror and say that because it is a warping of space time we cannot calculate forces and the bridge will fail.
Don't ask for an absolute answer. Science doesn't work like that. Only students believe that we know the answers.
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nyphdinmd say: Gravity is the curvature of space-time due to mass-energy. You feel a force while sitting on the surface of the earth because space-time wants you to fall toward the center of the earth but the matter of the earth is pushing back against you keeping you from falling. If the earth were to suddenly shrink to a point at its center, you would no longer feel a force, you would just begin to fall.
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PALANGGA_KO say: No. Gravity is not the curvature of space-time. Space-Time curvature is the result of the existence of gravity. Actually, space is not literally curve. Only the moving object that creates a curve path. Or such moving object is expected to move in curve path. This is all due to gravitational pull toward the object where it revolves. That revolving object is pulled toward the inner core of an object where it revolves. The foot prints of a moving object creates the curve path . Or, the expected foot prints of a moving object is a curve path. The empty space surrounding around an object is not actually empty. It contains some so-called invisible matter or dark matter. The invisible matter can be thought like a pool of water or ether . Particles of dark matter serves as water or ether that makes all object in the universe suspended. So imagine a ball floating in the water not above water. Now, put a magnet inside the ball so that it will pull the object revolving around it. You can see the ball is pulling the object as it revolves toward its surface. That is, the magnet inside keeps on pulling it toward the ball's surface. Assuming the magnet is not strong enough such that the revolving object does not touch the surface of a ball; so, you will see the revolving object is somewhat flying above the surface of a ball. And this revolving object follows a curve path of a ball.