This is most likely a complete failure of comprehension on my part (as ussual), but Ive been thinking about this for the past while and have come to a unsatisfactory conclusion. In reference to an electro-magnetic field or a gravitational field, where do the particles get the energy to be attracted or pushed away? I know they have a POTENTIAL to do so, but where does that potential energy come from in the first place? Refering to gravitational fields, is it just because of a particular spacial configuration? Thats obvious in the sense that- we have 2 masses and they attract, you can give one potential energy in respect to the other by applying a force etc. However back to the original question where does that impeding attractive force come from to begin with? I reckon there is something fundamentally wrong with my understanding or this is edging on phillosophy. The concept of a potential field around say a static charged particle, a magnet or a large mass is a way of describing what is happening without saying where the energy came from. I will be very grateful if anyone can clear this up, or shead more light on it. Thanks. LTF. EDIT: We don't really know WHAT energy is in an absolute sence apart from little definitions. So I guess my question is edging philsophical ground. And the concept of potiential is indeed useful. I just don't like not knowing :P.