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Thread: If Gravity is not a force, how do we stand on earth's surface?

  1. #1 If Gravity is not a force, how do we stand on earth's surface? 
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    I strongly believe in the Einstein's theory that gravity is a wave that it bends light and the object having mass warp the space-time giving it a curvature. But one thing I'm not sure about is why it is said gravity is not a force? Experimentally, the Galileo's trial is right that if a feather and a ball are dropped from a certain height in absence of any material medium then both will take equal time to make an impact on the surface towards which it is falling. But please clarify if gravity is not a force then why any object falls towards earth's surface? or maybe I'm wrong or misunderstood it. Please clarify.
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  2. #2  
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    Quote Originally Posted by Chandrabhan View Post
    But please clarify if gravity is not a force then why any object falls towards earth's surface?.
    Because objects follow geodesics in spacetime. In the case of a spherically symmetric object (like the Earth), such geodesics are radial.
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  3. #3  
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    Do you have any picture depicting these geodesics? All that I have seen is that space-time is a sheet of fabric that has been bend by mass. But even today I'm unable to imagine that picture in my mind of the geodesics. Is it bent radially inward or radially outward?
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  4. #4  
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    Quote Originally Posted by Chandrabhan View Post
    Do you have any picture depicting these geodesics? All that I have seen is that space-time is a sheet of fabric that has been bend by mass. But even today I'm unable to imagine that picture in my mind of the geodesics. Is it bent radially inward or radially outward?
    Inward, see here.
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  5. #5  
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    Thank You, sir!
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