OK, a few things:

* What is the volume of a sphere of radius R?
* Anyone know the approximate density of iron?

And the biggy:

#declare SA = sphere {<0, 0, 0>, 1}
#declare SB = sphere {<+8, 0, 0>, 1}

SA is stationary. SB is travelling along the X-axis. Since the two have
equal mass (no, they do, cos it's my universe and I SAID SO :-), when SB
hits SA, SB will come to a complete stop, and SA will continue on with
(roughly?) the same velocity as SB had.

How suppose we change the start conditions:

#declare SA = sphere {<0, 0, 0>, 1}
#declare SB = sphere {<+8, +0.2, 0>, 1}

Unless I'm horribly mistaken, SB should bounce off SA at an angle (WHICH
angle??), transferring only some (HOW MUCH?) of its momentum to SA.

Anyone care to add details?

Thanks.
Andrew.

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