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• As a major form of resistance, drag and weight can include : normal forces, gravity, and air friction.  Drag can also be thought of  a resistance of a object moving through fluid. However, some drag and weight is required to allow wind and air resistance to create lift on an aircraft since thrust and drag must be equal for a steady flight.
  
• Equation of drag  =   1/2pv^2SC
  

• Where P is the density of the air, V is the velocity of the airspeed, S is the surface area, and C is the drag coefficient
  

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