I am always needing to explain how differentials work....why your open diff makes your tire with no traction dig a hole, while your tire WITH traction just sits there, etc....
I found this video, its old, but, that makes it use very simple demonstrations and language....and, its the ONLY one I've seen that really breaks it down so anyone can get it VISUALLY, without reading a thing.
http://www.wimp.com/differentialgear/
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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif