Question

Is earth inertial and non-inertial frame of references?Explain full answer?

Answer 1

Heya...!!!
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Inertia is a property of matter that holds true Sir Issac Newton's first two laws of physics:

An object at rest tends to stay at rest.
An object in motion tends to stay in motion.
Inertia is a measure of the force that keeps a stationary object stationary, or a moving object moving at its current speed. The larger the inertia, the greater the force that is required to bring some change in its velocity in a given amount of time.

Moment of Inertia:

Consider a cylinder or a sphere rolling down a surface without any external force. Moment of inertia is what determines the torque needed for the cylinder to stay in motion. It is also known as Rotational Inertia.

Inertial Reference Frame:

It is a coordinate system or a physical reference point which has a constant velocity and has zero acceleration.

Non Inertial Reference Frame:

It is a coordinate system or a physical reference that is undergoing acceleration with respect to an Inertial Reference Frame.

Is Earth a Non Inertial Reference Frame?

Now consider Earth and Sun. Earth is an Inertial Reference Frame as it revolves around the Sun at a constant velocity. But Earth rotating and at the same time revolving at a constant velocity is also due to a centripetal acceleration. So we can conclude that Earth in accordance with Sun is a Non Inertial Reference Frame. But when we consider Sun, a star in the Milky Way which itself is at a constant movement then doubt arises on how much this answer holds as Sun cannot be termed as Inertial Reference Frame.

Answer 2

Hi friend here is your answer

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We know earth is rotating about its axis, So its moving. We know everything in the universe is moving, absolute rest is nothing but just a imaginary thing.

A non-inertial reference frame is a frame of reference that is undergoing acceleration with respect to an inertial frame.

And, A frame of reference that moves with constant velocity with respect to an inertial frame is an inertial frame of reference.

So, The answer is earth is non inertial.

Example--

Suppose a book on a table is our object and earth as a Frame of reference, generally we take accelaration of book w.r.t earth as 0 but more accurately it is not 0(because earth accelarates), therefore force acting on a book will also be not equal to 0. Then how it shows that earth is a non-inertial frame , it only tells that a ≠0 and F ≠ 0, it does not tell that if a ≠0 , F=0 or vice versa.

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