Essentially an LSD differential doesn't quite lock the two wheels together like a "locker" does. An LSD differential redirects torque from the faster spinning wheel to the slower spinning wheels. This allows it to direct traction to the more surefooted tire instead of just simply locking them together. It esentially will wait for one wheel to spin faster before it kicks in. It mainly will help if you are offroading and one rear tire is in the air just spinning. An "open" diff would just send all the power to that airborne wheel, where as an LSD will redirect some of the torque to the wheel on the ground that isn't moving yet. there really isn't a force that's required other than some time of downward force on the one of the tires to give it a little traction. does that make sense? 
Later,
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Black Knight - 2004 Crew Cab XE-V6 4x4
"...God made men the way they are because we desperately need them to be the way they are. Yes, a man is a dangerous thing, but so is a scalpel. You don't make it safe by making it dull, but instead you put it in the hands of someone who knows what he's doing." - John Eldridge
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