Why does a dance floor heave only when certain kinds of dance steps are being performed?

Solution 38E When the dance floor vibrates, it has a natural frequency which is denoted as . onc0 people start dancing on it, the steps of the dancers vibrate with some different frequency denoted as . There is a phenomenon called resonance, which is defined as, when the natural frequency is equal to the frequency of oscillation, the consequences are severe. So, for some particular dance steps the frequency of the steps and the natural frequency of the floor matches, because of the resonance the floor heaves.