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Homework Help: Need help with model rocket thrust

  1. Oct 26, 2015 #1
    1. The problem statement, all variables and given/known data
    Hi. I'm in highschool physics, and as I'm only 2 months in, I still don't know much. We launched a model rocket as an experiment and I need to find the thrust after adding 100g of mass to the rocket's body.

    The engine is an Estes A8-3. My teacher told me that its thrust is 2N in less than 1s.
    The original mass of the model rocket is 35g, and we added 100g of mass to the body.
    I'm trying to find the thrust after the 100g was added, and then the average between the before and after.

    We haven't been taught anything about thrust and I don't have my book with me so I'm lost! I'm sorry if I didn't include important info, or if I seem like I don't know anything because I honestly don't in this case!

    Thank you,
  2. jcsd
  3. Oct 26, 2015 #2


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    Homework Helper

    If the engine is the same, I don't see why the thrust should change. Are you sure you're asked to find the new thrust and not the new acceleration?
  4. Oct 26, 2015 #3
    See that's why I was confused! I'm sure he said thrust. I have no clue what he means, but I'll ask him later. Thanks anyway :)
  5. Oct 26, 2015 #4


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    Staff: Mentor

    Thrust will depend a bit on velocity and velocity depends on the mass, but I think you can neglect this for your analysis here. Acceleration will certainly depend on mass.
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