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Figure 1. A rocket uses thrust to overcome the gravity of the Earth.[1]

Thrust is a force used to propel an object by expelling gas molecules at high speeds.[2] These molecules are what causes the object, such as a rocket, to accelerate. The gas is expelled because an engine or turbine does work on it, sending it to the rear of the engine; this generates thrust in the opposite direction of the moving gas.[3]


Visit NASA to learn more about thrust and different propulsion systems.


References

  1. WikiImages, Pixabay [Online], Available: http://pixabay.com/p-67721/?no_redirect
  2. R. D. Knight, "Force and Motion" in Physics for Scientists and Engineers: A Strategic Approach, 3nd ed. San Francisco, U.S.A.: Pearson Addison-Wesley, 2008, ch.5, pp.121
  3. NASA, What is Thrust? [Online], Available: https://www.grc.nasa.gov/www/k-12/airplane/thrust1.html