Newton's second law of motion is most generally stated as
Correct answer: B. force equals the rate of change of momentum
- A. force equals mass times velocity
- B. force equals the rate of change of momentum
- C. force equals mass times distance
- D. force equals momentum times time
Explanation
The general statement is that the net force equals the rate of change of momentum, which reduces to F equal to ma only when the mass is constant. The general form is needed for a rocket, whose mass falls as fuel burns. Mass times velocity is momentum itself, not force.
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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.
Practise Force and Motion
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