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UPCAT Science practice question 29: A rocket moves forward as hot gas is expelled backward. This is best explained by

Correct answer

B. Newton's third law

For every action there is an equal and opposite reaction. The backward thrust on the gas produces a forward force on the rocket.

A rocket moves forward as hot gas is expelled backward. This is best explained by

  1. Newton's first law
  2. Newton's third lawCorrect
  3. Newton's second law
  4. the law of conservation of mass

Why B is correct

For every action there is an equal and opposite reaction. The backward thrust on the gas produces a forward force on the rocket.

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