**Herong's Notes on Physics** - Version 3.21, by Dr. Herong Yang

Time Dilation in Special Relativity

This chapter provides an introduction of time dilation in special relativity. Topics include a thought experiment showing time dilation; calculation of time dilation factor (Lorentz Factor); reciprocity of time dilation; elapsed time of distant event.

Time Dilation - Moving Clock Is Slower

Demonstration of Time Dilation - Amy on the Train

Demonstration of Time Dilation - Bob on the Ground

Conclusion:

- Time dilation in special relativity refers to the phenomenon of the elapsed time between two events that happen at the same location in a moving frame is dilated when observed from a stationary frame.
- Lorentz Factor is the dilation factor of time in a moving frame observed from a stationary frame.
- A moving clock is slower when observed from a stationary frame.

Table of Contents

Introducion of Frame of Reference

Introduction of Special Relativity

►Time Dilation in Special Relativity

Length Contraction in Special Relativity

The Relativity of Simultaneity