空氣阻力點計

空氣阻力 F 與周遭流體的Viscosity和該物件的dimension 和 velocity 有關係
F = -bv
b 是常數 , 與 Viscosity 和 dimension 有關係

there are some formula of the air resistant for some pre-defined shape only, such as sphere, cube, cone, etc.

usually the air resistance is obtained by wind tunnel experiment. or computer simulation.

for more information, refer to textbook on fluid mechanics