Question

Which of the following statements is incorrect?

• A. Motion cannot be defined without a frame of reference.
• B. Earth is moving with respect to a person standing in space.
• C. Moon is at rest with respect to a person on the earth.
• D. Earth is at rest with respect to a person standing on the earth.

Answer 1

The correct option is C Moon is at rest with respect to a person on the earth.

The concept of motion always needs a frame of reference, to begin with. So with respect to a man standing in the space, the earth is always moving. Similarly, for a person standing on the earth, the earth is always at rest. But for the same person, the Moon is always in motion.