Conservation of linear momentum is equivalent to:
Correct answer: C. Newton's 3rd law of motion
- A. Newton's 1st law of motion
- B. Newton's 2nd law of motion
- C. Newton's 3rd law of motion
- D. None of the above
Explanation
Newton's third law of motion states that every action will have an equal and opposite reaction. This law is by the law of conservation of linear momentum as when two bodies collide, they both exert an equal amount of force on each other that they experienced through the other body and hence, the entire momentum of the system is conserved. Hence, C is the answer. Derivation of the law of conservation of momentum is done through Newton's 2nd law of motion.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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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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