Physics is that part of Science which deals with the properties of elements and matter, it’s pace, physical properties and more. The terms like energy, heat, temperature, how does the earth move and many more, are all included in physics.

It’s included in the **CBSE**, ICSE as well as the state board curricula and is a vital part in making a person’s career in the field of science. This subject is quite vast and every day there are new inventions coming in this field. But apart from that all the most difficult inventions are made by using the basic formulae of physics.

This article deals with those few important topics that must be known by everyone.

**The Laws of Motion (By Isaac Newton):**

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The laws of motion were discovered by Sir Isaac Newton in the year 1686. There are mainly 3 laws of motion,

- Law of Inertia- An object at rest or in motion will continue to be rest or in motion until and unless an external force is applied to that object.
- F=ma – This law states that the resultant force will be equal to the product of mass and acceleration.

- The third law is given as, Every action has equal and opposite reaction.

**Newton’s Law of Gravity:**Sir Isaac Newton also has discovered the gravity law. It states that the force between two objects will be directly proportional to the multiplication of the masses and inversely proportional to the square of the space between them. This can be explained as:

Suppose we have two objects having mass m1 and other has a mass of m2. The force acting outwards from the 1st object is termed as F1 and for the 2nd object it is F2. The distance between the two objects is r. Figure below shows the representation of the two objects.

Therefore, From Newton’s law of gravity,

[latex]F_{1} \propto \frac{m_{1}\times m_{2}}{r^{2}}[/latex]

Similarly, it is same for F2.

Therefore, Putting the Gravitational Constant G, the formula will be:

[latex]F=G(\frac{m_{1}\times m_{2}}{r^{2}})[/latex]

**Electrostatics:**

This is the part of **physics** that is concerned with the characteristics of static or slow pace electric charge. This includes many laws, like the Coulomb’s Law, Gauss’s Law.

The Coulomb’s Law is given as,

[latex]F=\frac{1}{4\pi \varepsilon _{0}}\times \frac{q\times Q}{r^{2}}[/latex]

Where,

F=Electrostatic Force

q= Test Charge

Q= Source Charge

r= The distance between q and Q

The Gauss’s Law,

[latex]\Phi_{E}= \frac{Q}{\varepsilon_{0}}[/latex]

Where,

[latex]\Phi[/latex]= Electric Flux

E= Electric Field

Q= Total Charge

[latex]\epsilon _{0}[/latex]= Constant of Electricity

There are more topics like Light, Laws of Thermodynamics, Conservation of mass and energy, Conservation of momentum and Relativity.

Concluding the article, just want to convey that these topics in Physics are more important than the ones in the other theories are derived from Physics.

**About the author:**

*With a degree in Engineering, SaswatiGhosh is a content writer by profession. She is passionate about creative writing and blogging along with an interest in reading and part-time teaching. She is presently exploring all about the digital education with Byju’s-the Learning App.*

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