## Sunday, August 23, 2020

### Gravitational force

The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart.
Newton’s Universal Law of Gravitation:  According to Newton’s Universal Law of Gravitation, force of gravitational attraction is

1. Directly proportional to the product of their masses
2. Inversely proportional to the square of distance between them

If M1 & M2 are masses of two bodies and r is the distance between them, from above two conditions we get the following relation between Gravitational force, masses and distance between the masses. Here G is Newton's Universal Gravitational constant whose value is 6.67x10 power -11 which means If two masses of 1kg each are separated by a distance of 1 meter then the force of gravitation between them will be 6.67x10 power -11N.

Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.