Question:
Is Earth an inertial or a non inertial frame?
Answer:
A non-inertial reference frame is a frame of reference that is undergoing acceleration or is being rotated with uniform speed with respect to an inertial frame.
A frame of reference either at rest or moving with a uniform velocity (zero acceleration) is known as inertial frame. All the laws of physics hold good in such a frame.
The surface of the earth is non-inertial because of the gravitational field of the earth.
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