> Presumably you want it to not be *too* flexible though, lest the power 
> steering mechanism stops working. It would be nice to still be able to 
> steer. ;-)

Well yes, I assume we're talking about "flexible" enough to allow a tiny jet 
of hydraulic fluid to open under really vigorous steering, not a bit of 
rubber that's going to twist through 180 degrees :-)

> Tell me, does this mean that there's no such thing as an inelastic 
> collission outside of textbooks?

YOu mean no such thing as an *elastic* collision?  No, not at a macroscopic 
level.  Any collision is going to lose some energy to sound, heat, plastic 
deformation etc, some things get pretty close though.

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