# Air Friction Calculator, Formula, Air Friction Calculation

## Air Friction Calculator:

Enter the values of air density, ρ(kg/m3), velocity, V(m/s), drag coefficient, Cd and area, A(m2) to determine the value of air friction, Fair(N).

 Enter Air Density: kg/m3 Enter Velocity: m/s Enter Drag Coefficient: d Enter Area: m2 Result – Air Friction: N

## Air Friction Formula:

Air friction, also known as air resistance or drag, is a force that opposes the motion of an object through the air.

This force is crucial in fields such as aerodynamics, automotive engineering, and sports science.

Air friction depends on several factors, including the speed of the object, the density of the air, the object’s cross-sectional area, and its shape.

The drag force increases with the square of the velocity, meaning that as an object moves faster, the force exerted by air friction increases exponentially.

Air friction, Fair(N) in Newtons is calculated by the product of 0.5, air density, ρ(kg/m3) in kilograms per cubic metres, square of velocity, V(m/s) in metres per second, drag coefficient, Cd and area, A(m2) in square metres.

Air friction, Fair(N) = 0.5 * ρ(kg/m3) * V2(m/s) * Cd * A(m2)

Fair(N) = air friction in Newtons, N.

ρ(kg/m3) = air density in kilograms per cubic metres, kg/m3.

V(m/s) = velocity in metres per second, m/s.

Cd = drag coefficient.

A(m2) = area in metres square, m2.

### Air Friction Calculation:

1. Calculate the air friction acting on a car:

Given:

Air density, ρ(kg/m3) = 1.225 kg/m3 (at sea level),

Velocity, V(m/s) = 30 m/s,

Drag coefficient, Cd = 0.3,

Cross-sectional area, A(m2) = 2.2 m2.

Air friction, Fair(N) = 0.5 * ρ(kg/m3) * V2(m/s) * Cd * A(m2)

Fair(N) = 0.5 * 1.225 * 302 * 0.3 * 2.2

Fair(N) = 0.5 * 1.225 * 900 * 0.3 * 2.2

Fair(N) = 1096.65N.

1. Calculate the air friction acting on a cyclist:

Given:

Air density, ρ(kg/m3) = 1.225 kg/m3 (at sea level),

Velocity, V(m/s) = 15 m/s,

Drag coefficient, Cd = 0.88,

Air friction, Fair(N) = 76.40625N.

Air friction, Fair(N) = 0.5 * ρ(kg/m3) * V2(m/s) * Cd * A(m2)

A(m2) = Fair(N) / 0.5 * ρ(kg/m3) * V2(m/s) * Cd

A(m2) = 76.40625 / 0.5 * 1.225 * 152 * 0.88

A(m2) = 0.5m2.

### Applications and Considerations:

• Vehicle Design: Understanding air friction is essential for designing more aerodynamic vehicles that consume less fuel.
• Sports Performance: Athletes, particularly in cycling and skiing, can improve their performance by minimizing air resistance through equipment design and positioning.
• Aviation: In aviation, reducing drag is critical for improving the efficiency and speed of aircraft.