Rune wrote:
> 
> How can I simulate air resistance to the movement of an object? If the
> object is moving with the velocity V, what will happen to the velocity (or
> speed) over time? In which way will it decrease? Linearly, exponentially, or
> something different?
> 

It's usually much more complicated depending on the object's geometry for
example.  You can quite well approximate it with a quadratic formula for
the acceleration/force depending on the speed.  

> Just to check if my general understanding of the terms is correct: I'd say
> that gravity increases the speed of an object linearly (assuming the object
> is falling downwards). Is that correct?
> 

Yes, The gravitational force is m*g where g is the acceleration.  

You might check:

http://www.lerc.nasa.gov/WWW/K-12/airplane/bga.html
http://dmoz.org/Science/Technology/Aerospace/Aeronautics/Aerodynamics/

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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