Consider a space ship which is not under any force. Being inside the space ship, I will make a robotic fly from the platform to crawl inside using my remote. For simplicity assume that space ship will be drifting at uniform speed only under forward direction with respect to me, or else it will be under rest. The following experiment is assumed to be done in vaccum.
From the top, the first image is of space ship. Assume that I am at point A and the robotic fly to be beside me as shown.
In the second image, I will make the insect just to lift up and I will stop its engine, as the robot is not under any force it will not fall down, it will stay where it was. As the fly will continue to be under same motion as the space ship, I will not be able to tell whether my ship is moving or not.
In the third image and fourth image, I will apply force to the robotic fly to move little back and I will stop its engine.
(Third image) If the ship was under forward motion, the fly, because of the applied force backward i.e against its acquired motion from the spaceship, the forward motion of fly will not be synchronzed with the forward motion of the ship, so it will crash the wall with in an interval of time. This ensures that space ship was under uniform velocity.
(Fourth image) If the ship was at absolute rest, the fly, even though there was an force applied in the backward direction, the fly will not crash with the backside of the space ship. This ensures that space ship was at absolute rest.
But, according to Feynman:
The principle of relativity was first stated by newton, in one of his corollaries to the laws of motion: "the motions of bodies included in a given space are the same among themselves, whether that space is at rest or moves uniformly forward in a straight line." This means, for example, that if a space ship is drifting along at a uniform speed, all experiments performed in the space ship and all the phenomena in the space ship will appear the same as if the ship were not moving, provided, of course, that one does not look outside...........in a moving space ship the electrical and optical phenomena should be different from those in a stationary ship.
Hoping that my above experiment is neither optical nor electrical, my experiment is in contradiction with the Feyman's explanation. From my experiment, I am able to say whether the space ship is moving or not. How is it possible?