Galilean Transformation: transformations made under the assumptions that time measurements (and space measurements) are independent of the observer
Simultaneity: If two events happen together, they are said to be happening simultaneously.
Inertial Frame of Reference: It has constant speed e.g. a rotating frame
The two postulates of special relativity:
- The speed of light in a vacuum is the same constant for all inertial observers
- the law of physics are the same for all inertial observers
Light clock: a beam of light reflected between two parallel mirrors may be used to measure time
Proper time interval: it is the time measured in a frame where the events take place at the same point in space.This turns out to be the shortest possible time that an observer could correctly record for an event.
Proper length: The length measured by an observer at rest relative to the object. This is longest measurement of an object because as with time, the length of an object at rest relative to the observer is not the same as the length of the object measured by a moving observer.
Proper length: The length measured by an observer at rest relative to the object. This is longest measurement of an object because as with time, the length of an object at rest relative to the observer is not the same as the length of the object measured by a moving observer.
