Knowledge of Physics

 Have you ever thought on why can't we leave earth's surface ? Why do we keep our feet always touching on the earth's surface ? Why can't we fly in the sky just as birds do ? Obviously, you would say, 'Because I don't have wings to fly'.  Having wings is not just a reason that birds can fly. It is because wings can do work against the pulling of earth's gravity. More the surface of wings, more it can produce energy against the gravity, the more it takes birds higher in the sky. But gravity does not stop pulling birds down to the earth's surface. After flying some times, birds get tired. They take benefit of branches of tree to take a rest. This is the magic of gravity of earth. It keeps pulling you. It does not want you go away from it.   It keeps saying you, Love me like you do, la la love me like you do .... Touch me like you do, ta ta touch me like do ...... (just a part of a song 😊). And you need to keep touching it. You can't go away from i...