Every event that occurs in this universe is result of four forces which is present in this universe, which are:

1. Gravity
2. Electromagnetism
3. Strong Interaction
4. Weak Interaction

    Without the presence of these forces no any stuff in this universe can exists. What we see, what we breadth, what we feel everything is result of these four forces and nothing can be exists without these forces. These forces have power to create something and have power to destroy something, power to attract something and have power to repel something, power to squeeze something and have power to expand something, power to move something and have power to stop any moving object.
    These forces have given the shape to every stuff of this universe. So, let's talk about the most common force which we feel everytime and that is, Gravity.

Gravity



- Today almost everyone have a good idea about this force but, still we haven't found any appropriate reason of this attraction. Gravity is a force which is posses by the every stuff of this universe. This force was described by the Isaac Newton for the first time, according to him gravitational attraction between two objects is directly proportional to their masses and it is inversely proportional to the square of the distance between their centers. But he haven't described, why this attraction happens.
    Every masses in this universe attract another mass. Gravity has an infinity range that means your body is attracting any celestial body which is located even in another galexies. But those forces are extremely negligible because gravitational attraction is also determines by distance. And also we know the nearest and massive body around us is the Earth so we attracted by the earth. The planetary motion described by the Kepler was fully based on this force whether he was wrong but, he had given a way to think the planetary motion. Gravitational force created by any object is originated from their centres but that is only behaves like that.
    In the beganing of the 20th century Albert Einstein described his theory- General Relatively and Special Relatively. He described that space is a fibre which is woven up of two dimensions Space and Time. And any mass in this fibre create a distortion on it which makes other stuffs to revolve around it.

How Gravity played an important role in the making of this Universe.

After the creation of atom, elements and molecules after all matter (Massive celestial body). They all start attracting each other and start revolving massive body. As we can observe our earth revolving around the sun.

Electromagnetism



And the second one is electromagnetic force, which is one of the most important and powerful force in this universe. We commonly take electricity and magnet as two different from, but truth is that both of these are same thing. We use electricity to run our appliances and this energy becomes our daily requirement. Our ceiling fans, screens, speakers, microphones, camera etc. These all works with electromagnetic force. But we only use magnetism for sticking our fridge stickers and so on. But actually we generate electricity by using magnets.
This force also helps electron inside an atom to keep revolving the nucleus. If this force stop working then all the atoms will not exist. This is the force which makes this universe visible, this is the force which cause fire. How? We see anything due to a phenomenon called quantisation of the energy which can't be describable without an atomic model. Light is an electromagnetic wave, when you look something at that time your retina is just striked by the photons particles which is just reflected by the objects which you are looking. Our eyes is the most essential sense organ. We have evoluted our eyes about millions of years ago. If you want to read more on light then you can search or on our site. Now, let the reaction between carbon and oxygen, as we know carbon have valency of four+ electrons and oxygen have two- electrons, and when both react with each other it produce large amount of heat and CO2 gas. Here also electromagnetic force is working.
    As like Gravity electromagnetic force also have infinity range, but here is an exception, gravity attract every mass but electromagnetic force determines by the charge. Like charge repel and unlike charge attract.

And the third force is Strong Interaction


Strong Interaction




It is the strongest force in our cosmos where ever we have not heard about it in our daily life. This force is hundred times more stronger than electromagnetism and about hundred millions time much stronger than gravity. But here is a problem that it's range is about billionth of million meters which is really a small range, so now you will say this force doesn't play any role in the formation of the universe. But truth is completely different, without strong Interaction nothing can exists, because it is the force which keeps protons in the nucleus, because we know that like charge repel that's why there is need of another force which have more power than electromagnetism and that is Strong Interaction.

And the fourth one is Weak Interaction

Weak Interaction

You can judge a bit by its name it is a weak force but it means not that it is unnecessary it can turn a neutron to proton and proton to neutron. But the question is - why it would do that?
Within some atoms there is an unstable ratios of neutrons and protons. When there is too many neutrons in an atom then weak interaction simply turns it in to protons ( or vice versa ). This phenomena is called 'Beta Decay'. Thus we can say that weak interaction have power to change any atom by just changing neutrons in to protons. It can change Carbon to nitrogen or hydrogen.

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