Ive got a few(hopefully simple questions).

1. How do I find the moment of inertia of a line segment?

2. Why dont line segments collide with each other?

3. How would I get a circle to roll at a constant speed(No accelleration)?

also:

with cpSpaceResizeActiveHash and cpSpaceResizeStaticHash

according to the moon demo, the first argument should be the average size of your objects, is this diameter, or radius? According to the moon demo, the second number is related to the number of objects you are putting, is this max or average number. In the docs, it says this should be around 10x the size, which isnt related to the number at all, so which one is right?

Thanks