Physics Notes - Herong's Tutorial Notes

∟Introduction of Time

This chapter provides an introduction of time. Topics include what is time; standard unit to measure duration of time; how long is one 'second'.

What Is Time

What Is Duration

Second Prefixes and Other Units

List of Various Durations

Takeaways:

• Time is a property of our universe that gives us a sense of age of living things and speed of changing object.
• "second" is the standard unit to measure duration in time.
• Today, "second" is officially defined as "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom".
• Roughly, a "second" is the half period of a one-meter long pendulum.

Table of Contents

 About This Book

 Introduction of Space

 Introduction of Frame of Reference

►Introduction of Time

 Introduction of Speed

 Newton's Laws of Motion

 Electromagnetic Fields

 Introduction of Light

 Speed of Light

 Introduction of Special Relativity

 Time Dilation in Special Relativity

 Length Contraction in Special Relativity

 The Relativity of Simultaneity

 Introduction of Spacetime

 Minkowski Spacetime and Diagrams

 Introduction of Hamiltonian

 Introduction of Lagrangian

 Introduction of Generalized Coordinates

 Phase Space and Phase Portrait

 Poisson Bracket Expression

 References

 Index

 Full Version in PDF/ePUB

Introduction of Time - Updated in 2026, by Herong Yang