Rotational dynamics is the study of the motion of objects that rotate around an axis. It involves understanding how forces and torques affect the rotation of these objects. Key concepts include moment of inertia, which measures an object's resistance to changes in its rotational motion, and angular momentum, which describes the quantity of rotation an object has. In rotational dynamics, the principles of Newton's laws of motion apply similarly to linear motion. For example, a net torque acting on an object will cause it to accelerate in rotation, just as a net force causes linear acceleration. This field is essential in various applications, from engineering to astrophysics.