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Laws of Motion
Question
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Is the earth non-inertial frame of reference?

Answer

The surface of the earth is a non-inertial frame of reference because of the gravitational field of the earth. The direction of motion of the earth is continuously changing. Thus, it's velocity is also changing. 
Rate of change of velocity is acceleration. Hence, the earth is non-inertial frame of reference. 

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Some More Questions From Laws of Motion Chapter

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