Drag Force on a Football

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f_d =
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MichaelBartmess.Drag Force on a Football
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This equation computes the drag force on a football.

The equation for drag force is F_d = 1/2 * rho * A *C_d * v^2

We use the vCalc equation, Force of Drag, where we have set the air density, rho, to be a default air density of 1.2754 (kg)/m^3.

We use the drag coefficient for a cone (see again the Force of Drag vCalc equation) of 0.50.

The cross sectional area of a football, A, is defined by the vCalc constant, Maximum Football axis_1 or axis _2 - NCAA, (which we call  R) and we use R as the radius of the cross sectional area.  So, the area is defined as A = pi * R^2.

From the paper by Horn and Fearn, we estimate the default velocity of a well-thrown football to be 20 m/s