There are many places, people, maybe entity’s even that are able to teach the use of force. Some are Jedi master, police officers and even security officers. When to use force, may be a better question to ponder, because the use of force can possibly cause you lot’s of problems. For instance the use of force be justifiable as well as unjustifiable or maybe even deadly as well as excessive. But,in simple terms, force is used when something has been caused to move! Such as in the laws of gravity, or even when something is pushed, pulled or dropped.