What is gravitional force?

Answer 1

It is the attractive force that all matter possesses for other matter. We're pretty sure of that. We can, thanks to Newton, measure it and describe how it usually behaves. Einstein understood it as an effect of curved space/time, and not as matter dependent.

Thanks to Newton and Einstein, we know enough to think and talk about it, but we still don't completely understand its fundamental nature. We may have to understand the fundamental nature of light before we can understand gravity, since light photons have (we're pretty sure) no mass and yet are affected by gravity (gravitational lensing).

Answer 2

Gravity is a fundamental force that causes objects with mass to be attracted to each other. The force of gravity is defined by Newton's law of universal gravitation, which states that the force is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between their centers. It is responsible for holding planets in orbit around the sun and giving weight to objects on Earth.

Answer 3

The attraction that one mass exerts on another over a distance.

Answer 4

The gravitational force is a force between any masses. The force is stronger when objects have a greater mass, and when they are closer together.