When in situations like there's a very long ledge across from you use your force jump but go back as far as you can then run.
When you get half way charge up your force jump then when you are the ledge release the force jump button and you'll get to the other side.
This may take some practice but you'll get better every time you do this trick.
More tricks, tips and cheats for this game are right here - Star Wars Jedi Knight: Mysteries of the Sith cheats
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