FRAME OF REFERENCE

A system related to which the motion of any object is described is known as frame of refraction .
                         OR 
In the other words we can say the set of co-ordinate axis  attached to a specified body related to which position of particles or of a motion of body or time in a space can be described is known as space-time reference frame .
There are two types -
Inertial frame of reference
Non Inertial frame of reference

Inertial frame of reference - The frame of  refraction in which Newton Law hold's good are known as inertial frame of reference.
 

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