Accelerating object air resistance

[ojsimon]

Ok so i have the distance traveled of an object assuming air ressistance is 0 and the distance traveled with air resistance included as well as the acceleration of the object, how would i calculate the coefficient of air resistance?


Thanks

 

[Lsos]

If it's a simple shape you can find it on the internet, such as this chart:

But if it's something more complex...which is pretty much anything, I don't think you can figure it out using paper and a pencil. Either through experiment, or maybe with some powerful physics program.

 

[ideasrule]

Ok so i have the distance traveled of an object assuming air ressistance is 0 and the distance traveled with air resistance included as well as the acceleration of the object, how would i calculate the coefficient of air resistance?


Thanks

Do you also know the initial launch angle or launch speed? If so, you can write a simulation program that predicts the projectile's range for different coefficients of air resistance, then see which one is the closest.

 

[Bob S]

There are two classifications of air drag; Stokes Law drag or turbulent drag, depending on whether the Reynolds number Re is below or above about Re ~1000. See

http://en.wikipedia.org/wiki/Drag_(physics )

The air drag for projectiles is usually turbulent, and the power loss (energy loss rate) is proportional to velocity cubed (see above url).

Bob S

 

[sardar]

for sharing your data and question. To calculate the coefficient of air resistance, first we need to understand the factors that affect air resistance. These include the shape and size of the object, the density of the air, and the velocity of the object.

To start, we can use the equation F = 1/2 * ρ * v^2 * A * C, where F is the force of air resistance, ρ is the density of air, v is the velocity of the object, A is the cross-sectional area of the object, and C is the coefficient of air resistance.

We already have the values for distance traveled and acceleration, so we can use the equation v = at (where v is velocity, a is acceleration, and t is time) to calculate the velocity of the object with air resistance included.

Next, we need to estimate the cross-sectional area of the object and the density of the air. This can be done by measuring the dimensions of the object and using the known density of air at the given temperature and altitude.

Once we have all the necessary values, we can rearrange the equation to solve for the coefficient of air resistance (C). It may require multiple trials and adjustments to get a more accurate result, as air resistance can vary depending on the object's orientation and other factors.

I hope this helps you in your calculation. Keep in mind that air resistance is a complex phenomenon and may not always be accurately represented by a single coefficient. Further experimentation and analysis may be needed for a more precise understanding.