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Homework Help: Lift force problem

  1. Oct 17, 2005 #1
    A 4510 kg helicopter accelerates upward at 2.1 m/s^2. What lift force is exerted by the air on the propellers?

    The answer is in Newtons.

    If you can give me an equation, that would be great. Thanks
  2. jcsd
  3. Oct 17, 2005 #2


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    What have you tried? I would think your book or instructor would have given you some equations of motion. Nothing?
  4. Oct 17, 2005 #3
    I looked through all equations in the chapter and none seem to fit.
  5. Oct 17, 2005 #4


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    How about Newtons' Second Law of motion?
  6. Oct 17, 2005 #5
    k Newton's second law

    a = Fnet/m

    so 2.1 = Fnet/4510 and for Fnet you get 9471 but what then
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