Definition:
The Special Theory of Relativity is a theory where various physical phenomena depend on the relative motion of the observer and the observed objects. In other words , it explains how space and time are linked together for objects moving in a constant speed. It is developed by Albert Einstein.Postulates:
- There are two postulates for this theory:The laws of physics are same in all inertial frames. This is the principle pf relativity.
- The speed of light in vacuum is constant and same as observed from all inertial frames. This is known as the principle of constant of speed of light.
The first postulate of the Special Theory of Relativity relates to the reference frames. A frame of reference is a set of coordinates used to determine positions and velocities of objects in that frame; different frames of reference move relative to one another.
There are two types of frames:
Inertial Frame of Reference
An inertial frame of reference is a frame where a body moves with constant speed or remains at rest with respect to other frame of reference. An inertial frame of reference has a constant velocity so the acceleration is zero.
Non-inertial Frame of Reference
A non-inertial frame of reference is a frame where the body is accelerated without the act of the external force.
As a conclusion, the laws of physics are same in all inertial frames of reference.
The second postulate is related to the speed of light which equals to 3x10^8 meter/second and this speed is the same in all inertial frames.
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