A physical pendulum composed of a uniform rod with a sphere on the end of it is an interesting example of a combination pendulum. By examining its moment of inertia, the period is determined to be

For a rod of length L = cm and mass m_{r} = gm attached to a sphere of radius R=cmand mass m_{s} = gm, with an acceleration of gravity g=m/s^{2}, the period is T = s compared to a period of s for a simple pendulum for which length equals the distance to the center of mass of the sphere.