Per NCERT §4.6, two forces on the SAME body that happen to be equal and opposite (e.g. gravity vs normal force) constitute which?
ANot an action-reaction pair
BAre only sometimes
CAre by definition such a pair
DAre always an action-reaction pair
Answer & Solution
Correct answer: A. Not an action-reaction pair
NCERT §4.6 + Ex 4.12: action-reaction pair requires DIFFERENT bodies. mg (Earth on body) ↔ normal force (floor on body) are both on the body, NOT a 3rd-law pair.
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