I need to calculate a spring constant using measurements from a Hooke's Law Apparatus, a spring, and some weights. Frankly, I have no idea what I need to do. I've taken the measure ments, and discovered the formula F=kx, where F=Force, k=spring constant, and x=the compressed distance. I'm not sure if this is the proper formula, but heres what I tried to figure out. If Im solving for k, then k=F/x. Problem is, I do this for the different lengths of the spring and masses of the weights, and get differentiating answers for the constant. So here are my questions: 1) Am I even using the right formula? If I'm not, you can go ahead and call me a dunce now and give me the right one. 2) Shouldn't a constant be...well...constant? And help on this matter would be greatly appreciated.