Hi, I have a question from a lab experiment for an online course. The question states "In a real spring experiment, you wouldn't expect the period predicted by the formula for the period of a harmonic oscillator. What is the reason for this, and the would the actual value be larger or smaller than the predicted one?" My partner and I initially thought it was air resistance, but we finally concluded that air resistance would not have an affect on the period of the spring. The spring in question is one that is hanging downward with a mass attached to it. Any suggestions? Thanks in advance.