Any real spring has mass. Do you think that this mass would make the actual period of a real harmonic oscillator longer or shorter than the period predicted by the equation T= 2*pi*square root m/k. Explain your reasoning. I think it will affect the period because I am thinking that the mass of the spring will determine the value for k. So if k is varying then, yes it will affect the period. Does it make sense that the mass of the spring is related to k?