Flight of a rocket in the space is an example of______________________?
Correct answer: B. third law of motion
- A. second law of motion
- B. third law of motion
- C. first law of motion
- D. law of gravitation
Explanation
A rocket moves forward by ejecting gases backward, so the gases exert an equal and opposite thrust on the rocket according to Newton's third law. This action-reaction pair allows the rocket to accelerate even in space, where there is no air to push against. The likely mistake is choosing the second law, which describes the rocket's acceleration due to the thrust but not the origin of the thrust.
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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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