The heavy spring at work

@inproceedings{Sparavigna2011TheHS,
  title={The heavy spring at work},
  author={Amelia Carolina Sparavigna},
  year={2011}
}
Springs are used in simple demonstrations for the students of Physics classes to illustrate the Hooke's Law and harmonic oscillations. The spring is usually considered as a light object that does not possess a mass. What happens if the spring is heavy, that is, if its mass is not negligible? This paper aims to discuss this problem as plainly as possible.