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Homework Help: Newton's Law of Motion Problem, HELP :'(

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data
    Assume a 8-passenger learjet has a force of gravity of 66000 N [down] acting on it as it travels at a constant velocity of 640 km/hr [W]. if the forward thrust provided by the engines is 13000 N [W], determine:

    a - the upward life force on the plane
    b - the force due to air resistance on the plane

    2. Relevant equations

    3. The attempt at a solution
    i have absolutely no clue on how to even begin, im so lost. please help, thanks.
  2. jcsd
  3. Oct 17, 2009 #2


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    1. Is the plane accelerating the vertical direction (up or down)?
    2. What does this imply about the total vertical force acting on it?

    3. Is the plane accelerating in the horizontal direction?
    4. What does this imply about the total horizontal force acting on it?
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