# Fundamental Forces Of Nature

In this article, let us discuss the most significant concepts of science, that lay the foundation for the study of Physics. Many scientists and researchers have contributed to the growth and development of Physics. There are many concepts in Physics that have set the standard for studies.

These concepts are the reference and basics of modern Physics. Elemental concepts of physics include force, the universal law of gravitation, mass, weight, electricity, magnetism, Newton’s laws of motion, electric field, magnetic field, energy, work, and many more.

Here, we shall know in detail about the universal law of gravitation and magnetic field.

## Governing Force – The Gravity

Gravity is a natural phenomenon that is experienced in all places. The planetary elements like the sun, star, moon, and even the galaxy are bound to gravity. Gravity adds weight to the physical objects on the Earth. Gravity is the main force for the objects falling on the ground when thrown in the air. It also is the key reason for the ocean tides. It has an infinite range, and gravity decreases as the distance between the objects increases.

Gravity is considered to be the weakest of the fundamental forces. The key law that symbolizes gravity was put forth by Sir Isaac Newton and is known as the universal law of gravitation. This law was stated in the year 1687 and was used to explain the motions of the planets and moons.

The law states that” Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.”

The universal law of gravitation is symbolically represented as

Where,

F= gravitational force between bodies

G= universal gravitational constant

m1= mass of the first object

m2= mass of the second object

r= distance between the centers of two objects

The value of gravitational constant is given by G = 6.673 x 10-11 N m2/kg2.

Now let us know more about Magnetic Field.

## The Magnetic Field

As per Magnetic Field Definition, it is defined as the field created around a magnetic material or a moving electric charge within which the force of magnetism is felt. Magnetic force is also one of the fundamental forces of nature.

The magnetic field is represented by the letter B and H. Magnetic field is a vector quantity since it has both magnitude and direction. The magnetic field is represented using magnetic field lines. Magnetic field lines are the visual aid that describes the magnetic field.

They describe the direction of the magnetic force. These lines never cross each other and describe the strength of the field. These magnetic field lines originate from the north pole and terminate at the south pole of the magnet. The density of magnetic lines displays the strength of the magnetic field.

The unit of the magnetic field is Tesla.

The magnetic field varies the direction and magnitude, around an alternating current or a fluctuating direct current.

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