**Newton's Universal Law of Gravitation and Gravitational Force**

The concept of gravitation is one of the fundamental concepts of physics. It explains the force of attraction between two objects with mass. The law of gravitation was first introduced by Sir Isaac Newton in the 17th century. Newton's Universal Law of Gravitation explains the force of attraction between two objects with mass.

**The Law of Gravitation**

According to the law of gravitation, every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The mathematical expression of this law is given as:

F = G * (m1 * m2) / r^2

Where F is the force of attraction between two objects, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them.

**Gravitational Force**

The force of attraction between two objects with mass is called gravitational force. It is a conservative force, which means that the work done by this force is independent of the path taken by the objects. The gravitational force is always attractive, which means that it always pulls the objects towards each other.

**Gravitational Force on Earth**

The gravitational force of the Earth is what keeps us on the ground. The force of attraction between the Earth and an object with mass is directly proportional to the mass of the object. This means that the greater the mass of an object, the greater the force of attraction between it and the Earth. Therefore, heavier objects require more force to be lifted off the ground.

**Conclusion**

In conclusion, Newton's Universal Law of Gravitation explains the force of attraction between two objects with mass. Gravitational force is always attractive and is directly proportional to the masses of the objects and inversely proportional to the square of the distance between them. The gravitational force of the Earth keeps us on the ground and is directly proportional to the mass of an object.

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