Projectile motion with air friction

AI Thread Summary
The discussion focuses on understanding projectile motion with air resistance, specifically using a constant air friction equation. The user is struggling to obtain valid results from their calculations, despite providing initial values such as velocity, angle, mass, and diameter. They reference a website for equations and variables but initially encountered a broken link. After resolving the link issue, they express confusion about the validity of their results when substituting their initial values into the equations. The conversation highlights the challenges of accurately modeling projectile motion in fluid dynamics.
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I'm trying to understand the motion of projectile motion under the influence of air resistance. A website such as this details the necessary equations available to approximate this model: http://claymore.engineer.gvsu.edu/~michels/index_files/Golf%20Ball%20Paper%20Final%20draft.pdf
However, i am unable to calculate vaild results.
I'm using the constant air friction equation
x(t)=(24τV cosθ)/(C_D Re) e^(-((C_D Re)/24τ)t)+(24τV cosθ)/(C_D Re)
&
y(t)=〖(V sinθ+24τg/(C_D Re))( -24τ/(C_D Re) e^(-((C_D Re)/24τ)t) )+((V sinθ+24τ/(C_D Re))(24τ/(C_D Re)))-(24τ/(C_D Re))t

Reading on the linked website will provide in detail what these variables equal.

My results are
Velocity:v=2.85ms
Angle 60 degrees
mass: 0.004kg
Diameter: 0.016m
This is all done in the fluid of air
at around 20°C
 
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In what way are these not valid results?

[aside: the link is not valid]
 
Sorry what I'm meant to say is that my results are my initial values. When i sub these into the equation listed the results i obtain are invalid. Try the link again it should be vaild. If not just type into google search and click the most common url located
 
106267 said:
...my results are my initial values. When i sub these into the equation listed the results i obtain are invalid.
me said:
In what way are these not valid results?

However I now have the pdf linked to. Thanks.
 

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