In the world of Physics, trajectory is used to describe the curve or path of travel for an object. In a perfect environment, take space or a vacuum (a controlled environment immune to any outside forces) for example, the object will remain perfectly on its path of trajectory, indefinitely. It will never alter unless it is subject to some sort of external force. Think about that. If you throw a rock into space, and that rock does not come in contact with any debris, gravitational pull or atmospheric influences, its path of trajectory will continue forever in a predictable pattern. You could fast... Read More