Rotational dynamics is the study of the motion of objects that rotate around an axis. It involves understanding how forces and torques affect the rotational motion of these objects. Key concepts include moment of inertia, which measures an object's resistance to changes in its rotation, and angular momentum, which describes the quantity of rotation an object has. In rotational dynamics, Newton's laws of motion are adapted to account for rotation. The second law for rotation states that the torque acting on an object is equal to the rate of change of its angular momentum. This framework helps explain the behavior of rotating systems, such as spinning tops and planets.