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Peter Main

The mechanics of rocket thrust

A rocket launch vehicle obtains its propelling force or thrust through the action and reaction of fuel burned by its engines and ejected through its nozzle. Ron Holt explores the physics of rocket thrust and the potential uses of current and future rockets

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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

Rocket thrust in space is explained using Newton’s third law, and useful practical equations are derived using the ideas of impulse and momentum. Thermodynamics and an understanding of the temperatures and pressures of gases, as well as fluid dynamics, are required for a complete understanding of how rockets operate.

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