Here's a couple of level 4 force powers:
Heal Level 4:
- Heals 35 points of damage.
- Regenerates 1 hitpoint every 2 seconds.
Jump Level 4:
- Jump 16x normal height.
- All jumps are free while in flight (Zero force cost).
- Falling damage reduced to 1/4.
Speed Level 4:
- Run at 2x normal speed.
- Normal running speed is increased 10%.
Many of them confer passive bonuses to the wielder, some do extra tricks that aren't available on any of the lower three levels.