Multiple choice general knowledge science & technology

Which physical law is behind the idea of a rocket engine?

  1. The law of gravity

  2. The action-reaction principle

  3. The law on the conservation of energy

  4. The General Relativity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rocket engines operate on Newton's third law of motion - for every action, there is an equal and opposite reaction. The engine expels mass in one direction (action), creating thrust in the opposite direction (reaction). This principle, not gravity or energy conservation, is the fundamental mechanism. General relativity describes spacetime curvature but isn't the operating principle behind rocket propulsion.

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