Physics: Vector Norms and Orthonormal Systems

This lecture covers the concept of vector norms, orthonormal systems, and direction in physics. It explains how to represent vectors with norm equal to 1 using a hat symbol, and introduces the idea of orthonormal sectors. The lecture also discusses the importance of choosing the right origin in a coordinate system and explores the notion of perpendicularity. Additionally, it delves into the calculation of average velocity, units, and measurements in rectilinear motion, emphasizing the significance of instantaneous velocity. The lecture concludes with a discussion on the International System of Units (SI) and other measurement systems used in physics.