Gravitational forces are considered to be inherently linked to what we call ‘mass’. The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases.

Gravity is a force of attraction between two objects that depends on two things: mass and distance. Mass: The greater the mass of two objects, the greater the gravitational force between the objects.

When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.

98 N

1.62 m/s²

small g is acceleration due to gravity while big G is a gravitational constant. The acceleration which is gained by an object becauseof the gravitational force is called its acceleration due to gravity.

Zero gravity on earth is 0 m/s2. Not having to bear weight on your feet appears relaxing but in the long term, you could face many health problems like the weakening of bones and muscles.

The Zero Gravity Corporation, founded in 1993 by Peter Diamandis, Byron Lichtenberg, and Ray Cronise, operates a modified Boeing 727 which flies parabolic arcs to create 25–30 seconds of weightlessness.

If you are at the center of the earth, gravity is zero because all the mass around you is pulling “up” (every direction there is up!). If the earth were about 36,000 km in diameter with the same mass and length-of-day then the gravity at the equator would be zero.

Conversions

Mount Nevado Huascarán

In general, gravity also gets stronger as you get closer to the center of a massive object, but it turns out that the effect of having less mass closer to the center than you are is more important. At the exact center of the Earth, the gravitational field is actually zero.