Newton's first law of motion is valid in_______?
Correct answer: B. Inertial frame of reference
- A. Accelerated frame of reference
- B. Inertial frame of reference
- C. Non-inertial frame of reference
- D. None
Explanation
Newton's first law holds in an inertial frame, where a body with no net force remains at rest or moves with constant velocity. Students may choose a non-inertial frame because the law can appear to fail there, but that failure requires introducing fictitious forces.
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About Newton's Laws of Motion
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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