# How do you calculate the drag coefficient of air?

## How do you calculate the drag coefficient of air?

The drag coefficient Cd is equal to the drag D divided by the quantity: density r times half the velocity V squared times the reference area A. The drag coefficient then expresses the ratio of the drag force to the force produced by the dynamic pressure times the area.

### Which shape has the least drag if thrown in the air?

streamlined symmetric airfoil
A quick comparison shows that a flat plate gives the highest drag and a streamlined symmetric airfoil gives the lowest drag, by a factor of almost 30! Shape has a very large effect on the amount of drag produced.

Can a drag coefficient be negative?

Drag coefficient cannot be negative in steady flow and a negative value of drag coefficient in steady flow indicates a computational error. It can however be zero in unsteady flow instantaneously. Negative drag is thrust.

How do you calculate air drag?

The drag equation states that drag D is equal to the drag coefficient Cd times the density r times half of the velocity V squared times the reference area A. D = Cd * A * .5 * r * V^2. For given air conditions, shape, and inclination of the object, we must determine a value for Cd to determine drag.

## How do you calculate drag coefficient?

Rearranging the formula to find drag coefficient, we have: C D = (2*F D)/(ρ*v 2*A) But suppose we needed to find the drag coefficient of an object in order to find the drag force on the object; in other words, let’s say we didn’t have any data on both drag coefficient and drag force.

### What is the air drag equation?

The drag equation states that drag (D)is equal to a drag coefficient (Cd) times the density of the air (r) times half of the square of the velocity (V) times the wing area (A).

What is air drag in physics?

Air resistance, also known as drag, is a force that is caused by air, the force acts in the opposite direction to an object moving through the air.