1. A physical exertion on something.
2. The living field of energy, from Star Wars. Some people are stronger in it than others, mainly Jedi or Sith. The Sith are better. (Don't ask me how midi-chlorians come into this, at all.)
3. What I usually have to do in order to get the shit out of my ass.
1. They had to force the door open when I locked them out.
2. If you're a Sith, you get to shoot freakin' Force lightning out of your hands. COOL!
3. Use the FOOOOOOOOOORCE! *grunts*