Im currently researching momentum, kinetic energy and potential energy. I came across the idea that potential energy or an object at mechanical rest is still however in motion/ or a form of motion. The ideas are very dated however. 19th century. Tait - "potential energy is subsequently resolved into a form of actual motion" Kirchhoff - "Rest is a special case of motion" I think in general, and in principal it is correct. But lacking a physics background im looking for further information. my thoughts so far are, that an object would still be technically moving at rest on the macro scale as the earth is spinning and in orbit, galaxy moves etc. And also on a micro scale, there will be subtle chemical changes on a molecular and quantum level. But i don't think this is the point that is being made. My only guess is towards relativity. In which rest is merely a relative position between objects. And there is no absolute rest. I''ll be much obliged if you can put me straight on this one.