I think im getting some concepts confused, so i need help clarifying the answers to the following questions: 1. can you use a rubber band instead of a steel spring in a scale to measure weight? - I said no, because it would break 2. Should the wires supporting a suspension bridge be elastic or inelastic? - I said elastic so that it can return to its original position, but I dont know how to expand on this... 3. How is a steel wire "very elastic" if it does not stretch much with large forces? - I am not sure at all about this one And k is independent of gravity right? (i.e., if you have a force and a displacement on earth, would those be in the same proportion on the moon? I'm thinking F/x = k equals a direct proportion but I might be breaking smoe rules). I spent a good hour before and that is the progress I have made.