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Homework Help: Projectile motion with drag and lift

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    Using a wind tunnel, I recorded lift and drag forces on an object and now I want to estimate where the object will land based on these forces. When I took the data from the wind tunnel, I changed the angle of attack at 2 degree increments from -10 to 30 degrees. This was done at 3 different wind speeds (80, 123, and 170 mph). I looked at 0 angle of attack at each of those speeds and created a linear relationship between the wind speed and drag force. I am using that relationship for generating the drag forces used in the equation. I know the initial velocity of the object is 76 m/s, the angles it will be launched at will be either 30, 45 or 60 degrees, and gravity will be 9.81 m/s^2. The goal is to see how drag will affect the object then how will adding lift will affect the object's flight?

    2. Relevant equations
    Vox = V*cos(theta), Voy = V*sin(theta), Dy = Voy*t + 0.5*ay*t^2, Dx = Vox*t
    Vox = initial x velocity, Voy = initial y velocity, Dy = distance in y, Dx = distance in x
    Fd = force of drag, Fl = force of lift

    3. The attempt at a solution
    I used an excel spreadsheet to do this problem where I tried to subtract the force of drag from the vertical and horizontal components of projectile motion and it seemed not to work. Any ideas where I can be going wrong?
  2. jcsd
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