What is the reason for the existence of gravity?

According to the law of universal gravitation, between two bodies of mass m1, m2, which are at a distance R, there is a force of mutual attraction F, which is determined by the formula: F = G * m1 * m2 / R ^ 2.

G is the gravitational constant.

G = 6.67 * 10 ^ -11 N * m ^ 2 / kg ^ 2.

On the body m1, which is located on the surface of the earth, the force of attraction acts, which will be determined by the formula: F = G m1 * Mz / Rz ^ 2, where Mz is the mass of the earth, Rz is the radius of the earth.

The value G * Ms / Rs ^ 2 was called the gravitational acceleration g.

g = 9.8 m / s ^ 2.

The force of gravity Ft is the force with which the earth attracts bodies located on its surface.

The force of gravity Ft is determined by the formula: Ft = m * g, where m is the mass of the body, g is the acceleration of gravity.