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What Is Lorentz Factor
This section introduces Lorentz Factor, which is the factor used in the time dilation and other formulas in special relativity. 2023-12-10, ∼7893🔥, 7💬

💬 2023-08-03 Victor: You switched which time is proper time and which is dilated time. T' should be the elapsed time of the person at rest.

💬 2022-04-20 Tom: Thankd

💬 2019-08-29 Carl Burrnett: This was immensely helpful in my pursuit of trying to understand theoretical physics.

💬 2017-09-24 Shuvojit khan: There is anothere equation ΔE=PΔT

💬 2017-04-30 Abhishek Dogra: Thanks

Meter Based on Earth's Meridian
This section introduces an old definition of 'meter' which uses the Paris meridian line. A 'meter' is about one ten-millionth of the length of a quadrant of the Paris meridian. 2017-10-08, ∼2860🔥, 2💬

💬 2017-10-08 Herong: Peter, what's the difference between inaccurate and miscalculated?

💬 2017-10-07 Peter: This explanation is incorrect. You are inferring from speed of light definition and assuming a broader sense of “correct” and wo...

Reciprocity of Time Dilation
This section introduces the reciprocity of time dilation. Elapsed time of a moving clock is slower when measured by a stationary observer; and elapsed time of a stationary clock is slower when measured by a moving observer. 2020-06-26, ∼2579🔥, 3💬

💬 2020-06-26 Don Pedro: Time dilation as an observer in special relativity ...

💬 2017-12-09 Herong: Hanan, this is just a thought experiment. Actually, Amy and Bob will never be able to measure the other's clock.

💬 2017-12-05 Hanan Abid: And who is right Amy or Bob?? If they could see each other's clock. One clock would definitely be ahead of other or not its just...

The Constancy of the Speed of Light
This section provides a thought experiment to help understanding the second assumption of the special theory of relativity: The constancy of the speed of light. 2024-08-08, ∼2019🔥, 75💬

💬 2024-06-25 Hiroji Kurihara: Speed of Starlight A glass cube is floating horizontally in outer space. Two rays of starlight coming from the left and right ar...

💬 2022-11-19 Hiroji Kurihara: Light is Propagated in Two Ways 　　　　　　　　　　　　 In outer space, a starlight is reflected by a mirror. There is a formula c = ...

💬 2022-04-30 Hiroji kurihara: Herong, Thanks, for accepting my comments. Now, URL of my web-site is as follows, http://lifeafterdeath.vip/eng.html

💬 2022-04-27 Hiroji kurihara: Sorry, last a few words of my post (04-25's) are missing. It is.... m<m/2+m/2.

💬 2018-12-18 Herong: Hiroji, Thanks for sharing your comment and the article. I will definitely read it.

(More comments ...)

Newton's Third Law of Motion
This section introduces Newton's Third Law of Motion - If a force is exerted by one object to another object, another force is simultaneously exerted by the second object to the first object with equal strength and opposite direction. 2017-11-28, ∼1874🔥, 1💬

💬 2017-11-28 jimmy savile: little kids

Meter Based on Seconds Pendulum
This section introduces an old definition of 'meter' which uses a seconds pendulum. A 'meter' is the length of a seconds pendulum, which swings a full cycle in 2 seconds in small angles. 2017-06-14, ∼1607🔥, 1💬

💬 2017-06-14 Terry: I am going to try this

Measuring Speed of Light - Fizeau's Method
This section describes the method used by Armand Fizeau to measure the speed of light using using a rotating toothed wheel and a mirror. 2022-01-22, ∼1498🔥, 2💬

💬 2022-01-22 nina: just wanted to do this math question

Measuring Speed of Light - Roemer's Method
This section describes the method used by Ole Roemer to measure the speed of light using changes of observed eclipse periods of Jupiter's moon. 2022-11-12, ∼1354🔥, 3💬

💬 2022-06-22 nina: :))))

Newton's Second Law of Motion
This section introduces Newton's Second Law of Motion - The acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object. 2018-03-21, ∼1322🔥, 2💬

💬 2018-03-21 datboi: bojour

💬 2016-09-21 jjjjjjjjjr: This pic is awsome

Full Version in PDF/ePUB
Information on how to obtain the PDF version of this book for printing. 2022-04-13, ∼1320🔥, 3💬

💬 2022-04-13 amritash mukherjee: simplistically explained a very complex subject

💬 2017-08-03 zanchin: Thank you for the good work!

Relativity of Simultaneity in Minkowski Diagram
This section provides a demonstration of the relativity of simultaneity phenomenon using a Minkowski diagram. 2019-01-17, ∼1071🔥, 1💬

💬 2019-01-17 hiroji kurihara: Relativity of simultaneity From just above, plane waves of star light are coming horizontally. An observer stands on the ground ...

Galilean Diagram of Moving Frames
This section presents a single diagram that represents a moving frame overlaid on a stationary frame. The time axis of the moving frame is rotated towards the moving direction. 2017-09-27, ∼962🔥, 1💬

💬 2017-09-27 Salih Kırcalar: John David Best has his web site Vida İnstitute. He put my articles page in 'Timeflow Theory' 'http://vidainstitute.org/?page_id.. .

Reciprocity of Length Contraction
This section introduces the reciprocity of length contraction. Length of a moving object is shorter when measured by a stationary observer; and length of a stationary object is shorter when measured by a moving observer. 2021-01-31, ∼882🔥, 2💬

💬 2021-01-31 Herong: Abhinav, which part is confusing?

💬 2021-01-14 Abhinav: This is confusing

Physics Notes - Herong's Tutorial Notes
This book is a collection of notes on physics. Key sections are: What Is Space, Time and Speed; Frame of Reference; Coordinate Systems; Newton's Laws of Motion; Special Theory of Relativity; Time Dilation; Length Contraction; Minkowski spacetime; Lorentz transformation; Minkowski diagram; Hamiltonia... 2022-10-04, ∼485🔥, 0💬

References
List of reference materials used in this book. 2020-07-02, ∼441🔥, 1💬

💬 2020-07-02 Mangala: Important information

What Is Lagrangian
This section provides a quick introduction to the Lagrangian, which is a derived property of a mechanical system defined as the difference of kinetic energy and potential energy of the system. 2022-10-26, ∼364🔥, 0💬

Hamiltonian on Simple Pendulum Motion
This section provides an example of calculating the Hamiltonian on a mechanical system of an single object in simple pendulum motion and applying the Law of Conservation of Energy. 2022-10-19, ∼304🔥, 0💬

Falling Ball in Earth Frame of Reference
This section provides an example of a falling ball in the Earth frame of reference, where we need to add the gravitational force to make Newton's First and Second Laws of Motion valid. 2023-03-18, ∼301🔥, 1💬

What Is World Line
This section provides a quick introduction of world line, which is the path of an object left in a spacetime frame of reference. 2022-10-08, ∼290🔥, 0💬

Hamiltonian on Free Fall Motion
This section provides an example of calculating the Hamiltonian on a simple mechanical system of an single object in free fall motion and applying the Law of Conservation of Energy. 2022-10-19, ∼279🔥, 0💬

Measuring Speed of Light - Foucault's Method
This section describes the method used by Léon Foucault to measure the speed of light using using a rotating mirror and a fixed mirror. 2022-10-04, ∼269🔥, 0💬

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. 2022-10-13, ∼268🔥, 0💬

Phase Portraits of 2-D Homogeneous Linear Systems
This section provides a quick introduction on classifications of phase portraits of 2-D homogeneous linear systems based on characteristic polynomials of their linear coefficient matrixes. 2022-10-09, ∼254🔥, 0💬

Demonstration of Time Dilation - Amy on the Train
This section provides a thought experiment to demonstrate time dilation by starting with Amy synchronizing a clock with a bouncing light pulse on a moving train. 2022-10-04, ∼248🔥, 0💬

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Android ASP Astrology Big5 Bitcoin Blowfish Built-in C# Calendar CD-DVD Cheminformatics Chinese Cryptography DES Email Encoding Ethereum Flash GB2312 General H Herong History HTML Java JavaScript JDBC JSP JVM Linux Molecule Movie Music MySQL Neural Network Perl PHP Physics PKI Publication Python Reference REST SOAP Sorting Swing TV Series UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO