Wind energy is a renewable source considerably explored worldwide. Currently, attempts have been made to create wind farms on offshore areas, given the higher intensity and consistency of the wind resource. By doing this, conventional fixed foundation platforms become infeasible and floating structures have to be considered. One of the consequences for using these floating structures is the presence of troublesome motions, that increase mechanical stress and reduce the energy production of the wind turbine. Generally in the literature, this problem is evaluated with the use of numeric simulations, producing results for one specific case at a time. This paper proposes a classical mechanics approach, using a Lagrangian framework to describe the dynamics of pitch motion in a analytical formulation. This approach can describe the system response with a general model, instead of only numerical values, facilitating the comprehension of the most important parameters for the dynamic response.