Yoda clearly states the force is to be used for knowledge and/or defense. however there are things in ep2 that really irk me. when obi uses the force to levitate the map ball into his hand after him and yoda are walking out of the youngling classroom really annoys me. the force is used for knowledge and defense, not because you're too lazy to walk across the room to pick something up. also yoda using the force to levitate his walking stick after his duel with dooku is the same frivolous use of their power. does lucas even watch (or care) about his own movies?