**Physics Notes - Herong's Tutorial Notes** - v3.24, by Herong Yang

Introduction of Space

This chapter provides an introduction of space. Topics include what is space; standard unit to measure distance in space; how long is one 'meter'.

Meter Based on Earth's Meridian

Meter Based on Seconds Pendulum

Takeaways:

- Space is a property of our universe that gives us a sense of the size of an object and the distance between two objects.
- "meter" is the standard unit to measure distances in space.
- Today, "meter" is officially defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second".
- Roughly, a "meter" is the length of a pendulum the length of a pendulum with a half-period of one second.

Table of Contents

Introduction of Frame of Reference

Introduction of Special Relativity

Time Dilation in Special Relativity

Length Contraction in Special Relativity

The Relativity of Simultaneity

Minkowski Spacetime and Diagrams

Introduction of Generalized Coordinates