Work out a drag force for a unit sphere traveling through air at velocity. Values for formulae are below. The context of this question is that I am calculating this in an atmospheric environment. So the values provided are for air.
Through my research I have come across the following information.
Gravity = 9.80665 m/s/s
AirMassDensity = 1.204 kg/m^3
SphereRadius = 0.5 m
Velocity = 2 m/s
Drag Coefficient: c = 2F \ p * (v * v) * A
c is the coefficient.
F is the drag force.
p is the density of the fluid/gas.
v is the relative velocity.
A is the reference area of the object.
A) I don't know what F is in the Drag Coefficient formula. So I would be interested in finding this out, as I do not understand the description given.
B) I could calculate F if c is known, but c is also unknown.
C) As per this http://en.wikipedia.org/wiki/Drag_coefficient (at the bottom) it says that for some shapes, such as spheres, c is solely dependent on the Reynold's Number. It doesn't really go on to explain how and how I could calculate it for use in the Drag Coefficient equation.
D) Is this the correct way to do it, or am I way off? :)
Help/corrections appreciated as I'm stuck at this point unfortunately.
I'm basically wiring up my own physics simulation in a video game that I am programming for, and am doing this just to learn a little bit more about how forces interact, and advance my mathematics skills. One problem I have come across whilst learning complex things via online, is that often I am unsure what the question is I need to ask. I almost need to understand how physics works before I can ask a physics-related question. So forgive me if my terminology is incorrect, and I am very interested in any corrections to my understanding of the material thus far. Thanks!