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To project a rocket, which combination of principles is required?
ANewton's first law and the principle of moments
BNewton's third law and conservation of linear momentum
CNewton's law of gravitation and the principle of moments
DInertia of rest and the law of refraction
Answer & Solution
Correct answer: B. Newton's third law and conservation of linear momentum
1. Burning fuel is ejected backward, and by the third law the rocket is pushed forward.
2. With no net external force, total momentum is conserved as the gas and rocket move oppositely.
3. So rocket projection needs Newton's third law together with conservation of linear momentum.
4. Rule out option C: the principle of moments deals with rotation, not rocket thrust.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.20_
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