02. What is a rocket? (A K2S Question)

From The Space Library

A rocket is a device that generates a propulsive thrust by exhausting a propellant at a high velocity. The momentum of the exhaust mass creates a reactive force on the rocket vehicle. Possibly the simplest example is a balloon. When inflated and released the air inside is squeezed out by the elasticity of the balloon material. As the air escapes in one direction, the balloon, and the remaining air inside it, is pushed in the opposite direction. The balloon's motion is usually quite erratic because the direction of the escaping air is not controlled.

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Answer provided by John W. Cole

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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