A circular motion implies a rotation of the body around an axis. To describe this motion and determine its cause, we use linear and angular kinematic and dynamic quantities. The aim of this work is to investigate the physical quantities on which the body’s moment of inertia depends and to investigate and determine the influence of the moment of inertia on the kinematic and dynamic quantities in a circular motion. The investigation was carried out on a newly constructed experimental device. Most of the data was collected using a camera, as we recorded the motion caused by the rotational movement of a particular irregularly shaped body. Majoritiy of the data processing was done with the video analysis and physics modeling software Tracker. The moment of inertia of a body of a specific shape was determined using the method of least squares, and the proportionality with the mass of the body and the square of the radius in which the mass is located was experimentally proven. In addition, a student laboratory exercise was created on the basis of this work.