Calculate air friction, density, speed, drag coefficient or cross-sectional area from any four inputs with unit conversions and calculation steps.
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Air Friction Formula
The following formula is used to calculate the Air Friction.
Fair = .5 * p * V^2 * C * A
- Where Fair is the Air Friction (N)
- p is the density of the fluid (kg/m^3)
- V is the speed of the object (m/s)
- C is the air resistance coefficient
- A is the cross-sectional area (m^2)
How to Calculate Air Friction?
The following example problems outline how to calculate the Air Friction.
Example Problem #1
- First, determine the density of the fluid (kg/m^3). In this example, the density of the fluid (kg/m^3) is given as 124 .
- Next, determine the speed of the object (m/s). For this problem, the speed of the object (m/s) is given as 35 .
- Next, determine the air resistance coefficient. In this case, the air resistance coefficient is found to be .6.
- Next, determine the cross-sectional area. In this example, this is .25m^2.
- Finally, calculate the Air Friction using the formula above:
Fair = .5 * p * V^2 * C * A
Inserting the values from above yields:
Fair = .5 * 124 * 35^2 * .6 * .25 = 11,392.5 (N)
Example Problem #2
Using the same method as above, determine the variables required by the equation. For this example problem, these are as follows:
density of the fluid (kg/m^3) = 145
speed of the object (m/s) = 5
air resistance coefficient = .80
cross-sectional area (m^2) = .34
Entering these given values and solving gives:
Fair = .5 * 145 * 5^2 * .8 * .34 = 493 (N)
