Calculation of the drag force is fairly straight forward for simple shapes such as spheres or teardrops in air so I would include this component for more physical effects.
Drag = 0.5 * density * cross-sectional-area *velocity ^2 *Cd
where Cd - drag coefficient, remembering to use consistent UNITS of course!!!
the drag coefficient for simple shapes can be found on the web for a sphere this is roughly 0.5, however, if you wish to perform more accurate aerodynamic predicitions than this does vary with a dimensionless number called the Reynolds number. The Reynolds number is a function of the density, vsicosity, velocity and a characteristic dimension of the object i.e. the diameter of the sphere.
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