To study large amplitude swings of a physical pendulum. If we consider large angular swings of the pendulum we can calculate the period of swings starting from the Principle of Conservation of Energy.
Q o is the initial angular displacement.
Measure the mass of the meter stick to be used as the physical pendulum. Locate the axis of rotation and measure the distance from the axis of rotation to the center of mass. You decide how many oscillations should be taken to measure the dependence of period vs displacement angle. Make some trial runs before you start taking data. You have to explain the decision in your report .