A force of 20 N acts on a mass of 4 kg. The acceleration produced is
Correct answer: B. 5 m s-2
- A. 0.2 m s-2
- B. 5 m s-2
- C. 16 m s-2
- D. 80 m s-2
Explanation
From F equal to ma, the acceleration is 20 divided by 4, which is 5 m s-2. The answer 80 comes from multiplying instead of dividing, and 0.2 from inverting the ratio. Always check that the units resolve to metres per second squared.
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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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