text: Hello Friend! \n       Let us see a small example. If we are in a moving bus, the trees on the road side appear to be moving fastly in the opposite direction. Even though that the trees are at rest, they appear to move. This is due to the special  theory of relativity. \n       Even though that the earth is rotating with large velocity, the objects stay on the earth. The centripetal and centrifugal forces are responsible for the objects to stay on the earth in rest condition.