The resistance an object feels while moving through air is proportional to the square of its velocity as well as a constant that is specific to shape and orientation relative to the direction of movement. We can express this as a formula like this:

F_{air} = c v^2

For simpler geometric shapes, such as a sphere, we can calculate the constant c, however for more complex objects, such as a pineapple or an airplane, the value for the c needs to be determined experimentally.

Also note that the formula above is only true for subsonic speeds in the laminar flow regime.
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