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 [Broken](adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Projectile motion with air friction

**Physics Forums | Science Articles, Homework Help, Discussion**