__GRAVITY__The term”GRAVITY” has puzzled many people for centuries. But the first person to provide an answer to this question was Newton. When an apple fell on his head he wondered why the apple is falling down. He then worked on the subject and got the results on what we call as gravity. He said it is a force that exists between two bodies. He provided us with equation that enabled us to calculate the amount of force exerted on a body,

But he does not explain what, how and why gravity is caused. His theory also allowed us to calculate the behavior of matter to a certain limit.untill Einstein’s period no one was able to give a correct reason for gravity.Untill that newton’s idea on gravity was thought to be correct. Everything changed when Einstein published his theory of relativity.

__EINSTEINS IDEA ON GRAVITY__Einstein with his concept of space time curvature rocked the world of physics. He said that mass distorts space thus creating space-time curvature. We think that gravity is just a force that holds us on our feet. He simply rejected the idea that gravity is just a force. But we feel gravity as a force and we cannot simply reject the idea of force and accept gravity as space time curvature. Because it is weird to imagine gravity in Einstein’s way and at the other hand have been brought up by the idea that gravity is a force as in our text books. But it’s time to get an update on gravity.

As per the concept of space time curvature gravity works on the two rules

- A particle travelling in a gravitational field will take the shortest path
- A particle travelling in a gravitational field will travel along a straight path

Gravity |

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__CASE 1__Consider that you throw a ball. It will make its path through air and hit the ground but what’s weird about that .The fact is that it has taken the shortest path. But you think that everything is normal and you would not experience any difference. This is normal in the case of a ball. But it’s totally different when gravity is stronger so that not even light can escape from it.in the case of the ball it is subjected to a little gravity so nothing extraordinary happens. The below figure represents a ball thrown from point a.The ball travels and hits the point b.The path is a projectile motion. In reality the ball goes straight. No curved path but we see a curved path of the ball. This is because that space time is curved

Gravity |

Gravity |

__CASE 2:__In this consider a beam of light travelling straight into a black hole (a black hole is a dead star but with a very high gravity. Not even light can escape from it) when the beam reaches near the black hole its bends and moves into the blackhole.This is because it takes the shortest path.(it is the first law and not well explained in case 1).so if you think gravity as a force it will be pulling the object to ground. But as per space time curvature it is not a force so it should be going forever (i.e.) a ball thrown

Gravity |

**Post Author : Lordson Roy**

**College : Bethlahem Institute of Engineering**

Year : Third year IT (2013)

Year : Third year IT (2013)

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