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Transcript of Time dilation
Prepared by: Aseel Alharbi
Relative velocity time dilation.
When two observers are in relative uniform motion and uninfluenced by any gravitational mass, the point of view of each will be that the other's (moving) clock is ticking at a slower rate than the local clock. The faster the relative velocity, the greater the magnitude of time dilation. This case is sometimes called special relativistic time dilation.
Gravitational time dilation.
time dilation is a difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from a gravitational mass or masses.
A clock at rest with respect to one observer may be measured to tick at a different rate when compared to a second observer's clock. This effect arises neither from technical aspects of the clocks nor from the propagation time of signals, but from the nature of spacetime.
There are 2 types of time dilation.
- Relative velocity time dilation.
- Gravitational time dilation.
The key is that both observers are differently situated in their distance from a significant gravitational mass. The general theory of relativity describes how, for both observers, the clock that is closer to the gravitational mass, i.e. deeper in its "gravity well", appears to go more slowly than the clock that is more distant from the mass. In the case of a satellite orbiting a planet, it has the opposite effect of the relative velocity time dilation.
Galilo realised 400 years ago that he could not prove that the Earth was moving or stationary by taking measurements on the Earth. As an example he discussed goldfish in a bowl on a ship the fish move around in exactly the same way whether the ship is moving or not (assuming the ship is sailing at a constant speed on a calm sea). Movement of the goldfish or water in the bowl gives you no clue about the movement of the ship, to do this you would need to look through a widow at the shore. Even then, you would have to asssume that it was the ship and not the shore moving.
Frame of reference