Why GRAVITY is not a force.

moon


Why  "GRAVITY" is not a force.... according to the General Theory of Relativity which tells us gravity is not a force, gravitational fields don't exist. Objects tend to move on straight paths through curved spacetime. 

Albert Einstein once said that his happiest and beautiful thought of his life is imagining a man falling off the roof of a house. what made Einstine happy about this is it was the realization that this man, while he was falling wouldn't feel his own weight. he would be weightless or anything he dropped on his way down with him is remain stationary relative to him or moving in uniform motion. The whole situation is like when you in deep space in your spaceship(at rest) not near any large masses. Objects would remain stationary to you and if you push anything it will travel in a straight line with constant velocity and you would be the very definition of an inertial observer. You would not be accelerating no, gravitational field, laws of physics applied in your reference frame. Now if you look at these two scenarios and you will see that is are equivalent. But you might be thinking that why this situation is similar because falling under gravity and staying in space is different. But it's not. Imagine that your spaceship falling into a planet. Then both scenarios are similar. The path that the spaceship follows is curved SpaceTime and that curved path is called "GEODESICS", so basically there is no gravitational force. We just follow the path called Geodesics which is curved due to messier objects in space-time. "Matter tells spacetime how to curve, Space-time tells matter how to move" Now let's look deep into this, imagine what happens if your spaceship accelerates at 9.8m/second squared.

gravity

someone outside will all objects remain stationary, inside the ship everything would appear to accelerate down to the ground. This situation will be the same as on the earth while you are reading this article. So while reading this do you feel weightless, probably not, so you are not an inertial observer. Your situation exactly the same as someone accelerating on a rocket ship. And I don't mean that being at rest and a gravitational field is like accelerating and a rocket. you are accelerating and there is no gravitational field. That sounds crazy but in General Relativity there is no gravitational force, so we are accelerating upward because of the normal force acting on our body...., But you are not moving up relative to your frame of reference. But if some falling form a tall building then to his frame of reference you are accelerating upward. I think what this shows is that what an acceleration really is it's a deviation from a geodesic. 


astronaut

So technically you are accelerating but your coordinates are not changing which is proved by the equation of general relativity, Which simply says that due to curved surface the coordinates are not changing. So it's quite obvious that gravity does not exist and we are just following the space-time curve as a path and accelerating in space as well as in time.


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