Concepts Of Physics MCQ Edition [Volume 1]PhysicsNewton's Laws of Motion

Consider a frame of reference that is fixed to the earth. Which of the following statements are correct regarding this frame?

Options

AIt is defined as an inertial frame by default.
BIt cannot be an inertial frame since the earth revolves around the sun.
CIt cannot be an inertial frame since the earth rotates about its axis.
DIt qualifies as an inertial frame because Newton's laws are valid within it.

Correct answer

C. It cannot be an inertial frame since the earth rotates about its axis.

Step-by-step solution

A frame of reference fixed to the earth is a non-inertial frame because the earth is an accelerating body. The earth rotates about its own axis, which provides a centripetal acceleration to any point on its surface. The earth also revolves around the sun, which involves a centripetal acceleration directed towards the sun. Since the frame is accelerating, it is non-inertial.

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