Hi there. I was wondering if the univers is curved or if it is flat. By the way, one other question. When a person lifts an object the object gains Ep. Is the energy given to object by the person or does it gain energy by the Gravitational Field? even though i know that Forces (Gravity) cannot give or gain energy. If a person was born on top of a mountain where would the Ep come from? Would it be from Gravitational Field?