### Table of Contents

Definition

**Newton’s law of universal gravitation: **

Newton’s law of universal gravitation: Newton’s law of universal gravitation states that everybody in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Definition

**The gravitational force of attraction of the Earth: **

It is assumed that a gravitational field exists all around the Earth due to the gravitational force of attraction on Earth.

Definition

**The gravitational field strength of the Earth: **

In the gravitational field of the Earth, the gravitational force per unit mass is called the gravitational field strength of the Earth. It is 10 N kg^{-1} near the surface of the Earth.

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Definition

**Artificial Satellites: **

The scientist has sent many objects into space. Some of these objects revolve around the Earth. These are called artificial satellites.

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