Lecture
This lecture covers the concept of inertial frames of reference in mechanics, where there are no 'inertial forces' and Newton's second law holds. It explains that a frame in uniform rectilinear motion in an inertial frame is also inertial. The lecture discusses the conservative centrifugal force, potential energy, and the relationship with distance from the axis of rotation. It also explores external forces, such as gravity and Archimedes' buoyant force, in rotating frames of reference.