Lecture
This lecture explores the concept of central force motion using a simple experiment with a material point represented by a disk subjected to a central force directed towards a fixed point on a table. The instructor demonstrates the compensation of gravity imperfections, leading to a uniform transitional motion regardless of the initial conditions. The laws of Newton are shown to be perfectly respected in this system, with a subsequent demonstration of rotational motion of the disk around the center. The lecture also covers the concept of the motion invariant known as the desert constant, showcasing how the angular velocity changes with varying radii, despite minor imperfections and friction present in the system.