http://cgi.ebay.com/ebaymotors/VANAGON-CAST-IRON-FRONT-SUSPENSION_W0QQcmdZViewItemQQcategoryZ6755QQihZ016QQitemZ260133939554QQtcZphoto

Item #260133939554

"The ride difference between the sheet metal lower control arm suspensions,
and this one, is comparable to the *difference between a truck and a
Cadalliac*. If you have been wondering why your Vanagon just dosent ride as
nicely as that other Vanagon you once rode in, this is probably the reason.
The cast iron lower control arm *acts as a flywheel*. It absorbs the energy
caused by bumps in the road.* Stores it and keeps it from being transmitted
to you.* Arrive at the camp ground fresher with this suspension.  "

Could someone explain to how suspension can "act as a flywheel" and what
laws of physics it invents or overcomes by "storing energy" indefinitely?
Curious minds want to know!

--
Chris S.
Disclaimer: "Death and serious injury may occur"