Consider I am in the train with a ball traveling at normal speed of a train. I drop the ball, it follows a straight path of descent and falls in front of my feet. For an observer on the platform, the ball follows a parabolic path and falls in front of my feet. (Please go to this http://www.phys.unsw.edu.au/einsteinlight/jw/module1_Galileo_and_Newton.htm" [Broken] and play the flash. It is similar to the setup I have mentioned above) The doubt - The moment I, standing on the train, release the ball, the ball is in free space. And the only force acting on it is gravitational. Then why doesnt it fall straight with respect to the Earth [as that is the one which is pulling it] from the position in space it is released? That is, when the ball is released, it should fall few meters behind my feet as I would have moved with the train; whereas the ball was in free space. I know that the above description is a fact. But I just don't know why. Please do explain the reason. I think it is the same thing when we get down from a bus which is motion with respect to the road - you experience a force which pushes you for few meters and then you come to a halt on the road. Am I correct?