What is Inertial Frame of Reference?
In effect, a frame of reference is any coordinate system relative to which measurements are taken. The position of a table in a room can be located relative to the walls of the room. The room is then the frame of reference. For measurements taken in the college laboratory, the laboratory is the reference frame. An inertial frame of reference is defined as a coordinate system in which the law of inertia is valid. That is, a body rest remains at rest unless an unbalanced force produces acceleration in it. Other laws of nature also apply in such a system. If we place a body upon earth it remains at rest unless an unbalanced force is applied on it. This observation shows that earth may be considered as an inertial frame of reference. A body placed in a car moving a uniform velocity with respect to earth remains at rest, so a moving car is also an inertial frame of reference. Thus any frame of reference which is moving with uniform velocity relative to an inertial frame is also an inertial
