Imagine that you are on a train, traveling at a steady speed of 50 miles per hour mph. Your physics textbook on the table in front of you. Now, you and the textbook and the train are all moving at the same speed. To an outside observer standing next to the train tracks, you and the book are each rushing by at 50mph. But, from your point of view, the book isn't moving at all.
That is, it's not getting closer to or farther from you. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. What does relative to something mean? Ask Question. Simultaneity The relativity of simultaneity is the concept that simultaneity is not absolute, but depends on the observer's reference frame.
The question of whether the events are simultaneous is relative : in some reference frames the two accidents may happen at the same time, in other frames in a different state of motion relative to the events the crash in London may occur first, and still in other frames, the New York crash may occur first. If the two events are causally connected "event A causes event B" , then the relativity of simultaneity preserves the causal order i.
He deduced the failure of absolute simultaneity from two stated assumptions: 1 the principle of relativity —the equivalence of inertial frames, such that the laws of physics apply equally in all inertial coordinate systems; 2 the constancy of the speed of light detected in empty space, independent of the relative motion of its source.
General relativity , or the general theory of relativity , is the geometric theory of gravitation published by Albert Einstein in General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or space-time.
In fact, the equivalence of the two phenomena is what triggered Albert Einstein to examine special relativity. In his seminal paper on special relativity published in , Einstein begins by mentioning the equivalence of the two phenomena: Shifting the Paradigm of Physics Special relativity changed the way we view space and time and showed us that time is relative to an observer.
After , however, the Special Theory of Relativity destroyed this old, but intuitive, view. In order to examine this we must know the founding principles of relativity. The central point of the theory is the principle of general relativity, which states that all observers, regardless of their state of motion, will see the same laws of physics operating in the universe. The most famous prediction of the theory is that light rays passing near the sun will be bent — a prediction that has been well verified.
New Word List Word List. Save This Word! See synonyms for relativity on Thesaurus. The theory dealing with uniform motion special theory of relativity, or special relativity is based on the two postulates that physical laws have the same mathematical form when expressed in any inertial system, and the velocity of light is independent of the motion of its source and will have the same value when measured by observers moving with constant velocity with respect to each other.
Derivable from these postulates are the conclusions that there can be no motion at a speed greater than that of light in a vacuum, mass increases as velocity increases, mass and energy are equivalent, and time is dependent on the relative motion of an observer measuring the time. The theory dealing with gravity general theory of relativity, or general relativity is based on the postulate that the local effects of a gravitational field and of acceleration of an inertial system are identical.
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
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Should corporations get access to our brains? Nancy Shute February 7, Science News.
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