"Greg M. Johnson" wrote:
> 
> In anim 6, the structure on the right is falling straight downward.  One
> corner hits first and imparts lateral velocity to the structure but no spin.
> I'm not bothered by the amount of friction but by the lateral thrust.  I
> find this very counterintuitive, although perhaps I haven't played with a
> cubic array of balls.

I viewed it again and did not find the right 'cube' does not gain enough
spin during the first collision.  The lateral thrust does not seem that
unnatural to me.  If you let a cube sized rubber (or even a dice) fall on
a flat surface it can jump quite heavily to the side depending on the way
it hits the surface.  Of course the sidewards movement is usually slowed
down by friction as soon as it hits the surface a second time.

Christoph

-- 
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