Inertial and Non-inertial Reference Frames

Inertial and Non-inertial Reference Frames

Jul 25, 2022, 16:45 IST

About Inertial and Non-inertial Reference Frames

A reference frame in which Newton’s first law  is valid is called an inertial reference frame. In an inertial reference frame, body subjected to no net force will either stay at rest or move at constant velocity.

Any frame moving at constant velocity relative to a known inertial frame is also an inertial frame . If the acceleration of a particle is zero in one inertial frame, it is zero in all inertial frames.

An accelerated frame of reference is called a non-inertial frame. Objects in non-inertial reference frames do not obey Newton’s laws. Suppose a ball is attached to one end of a string and other end of the string is attached to the ceiling of a car which moves on the horizontal ground with an acceleration a. Experience tells us that in such a situation, the string will deviate away from the vertical.

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