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Lagrange Equation on Free Fall Motion
This section provides an example of applying the Lagrange Equation to an object in free fall motion.
2022-10-10, ∼241🔥, 0💬

Demonstration of Length Contraction
This section provides a thought experiment to demonstrate length contraction using a laser meter to observe and calculate the length of a carriage on a moving train from two different frames of references.
2022-10-11, ∼234🔥, 0💬

Length Contraction Formula and Lorentz Factor
This section provides steps to derive the length contraction formula expressed with the Lorentz factor, based a thought experiment and the time dilation formula.
2022-10-05, ∼232🔥, 0💬

Length Contraction - Moving Object Is Shorter
This section provides a quick introduction on length contraction, a phenomenon of difference of object lengths in the moving direction as measured by observers in different inertial frames that are moving relative to each other.
2022-10-06, ∼216🔥, 0💬

List of Various Durations
This section lists various durations to give us a sense of scale about time.
2022-12-26, ∼212🔥, 0💬

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'.
2022-10-05, ∼208🔥, 0💬

Time Dilation - Moving Clock Is Slower
This section provides a quick introduction on time dilation, a phenomenon of difference of elapsed time between two events as measured by observers in different inertial frames that are moving relative to each other.
2022-10-06, ∼207🔥, 0💬

Minkowski Spacetime and Diagrams
This chapter provides an introduction of Minkowski spacetime and diagram. Topics include introduction of Minkowski spacetime model; events interval; Lorentz transformation; Minkowski diagram; demonstration of time dilation and length contraction in Minkowski diagram.
2022-10-05, ∼206🔥, 0💬

Meter Prefixes and Other Units
This section introduces prefixes used on 'meter' to represent decadic multiples or fractions of a meter. It also covers other standard units to measure distances like foot, mile, nautical mile and lightyear.
2022-10-12, ∼203🔥, 0💬

What Is Light Cone
This section provides a quick introduction of light cone, which is a 4-dimensional surface in a spacetime frame where all events on the surface can be connected to a central event by light.
2022-10-04, ∼203🔥, 0💬

List of Various Speeds
This section lists various speeds to give us a sense of scale about speed.
2022-10-21, ∼201🔥, 0💬

Phase Portrait of Pendulum Motion
This section provides phase portrait examples for single object in simple pendulum motion.
2022-10-08, ∼201🔥, 0💬

Demonstration of Time Dilation - Formula
This section continues the thought experiment to demonstrate time dilation. An isosceles triangle is used to derive the time dilation formula with Lorentz factor.
2022-10-05, ∼196🔥, 0💬

What Is Phase Space
This section provides a quick introduction to Phase Space, which is the collection of all possible sets of canonical coordinates (q,p) of a system.
2022-10-31, ∼195🔥, 0💬

Introduction of Frame of Reference
This chapter provides an introduction of frame of reference. Topics include what is frame of reference; what is coordinate system; examples of 1-dimensional, 2-dimensional and 3-dimensional frame of references; 1 frame of reference associated with 2 coordinate systems.
2022-10-10, ∼195🔥, 0💬

Formula for the Relativity of Simultaneity
This section provides a thought experiment to derive the formula for the relativity of simultaneity.
2022-10-04, ∼194🔥, 0💬

Action - Integral of Lagrangian
This section provides an introduction of Action, the integral of Lagrangian of a given system between two time instances.
2022-10-30, ∼192🔥, 0💬

Action - Functional of Position Function x(t)
This section describes the Action S as a functional of position function x(t).
2022-11-20, ∼191🔥, 0💬

What Is Phase Portrait
This section provides an introduction to Phase Portrait, which is the trajectory curve of a system in the the Phase Space for a given period of time.
2022-10-05, ∼190🔥, 0💬

What Is an Inertial Frame of Reference
This section describes an inertial frame of reference - a frame of reference in which no acceleration can be detected in any direction.
2022-10-04, ∼187🔥, 0💬

Second Prefixes and Other Units
This section introduces prefixes used on 'second' to represent decadic multiples or fractions of a second. It also covers other standard units to measure durations like minute, hour, day and year.
2022-10-11, ∼186🔥, 0💬

What Is Spacetime
This section provides a quick introduction of speed, which is a mathematical model used to describe our universe in frame of references that combines space and time together.
2022-10-04, ∼184🔥, 0💬

Phase Portrait of Simple Harmonic Motion
This section provides phase portrait examples for a single object in simple harmonic motion.
2022-10-09, ∼183🔥, 0💬

Hamiltonian on Simple Harmonic Motion
This section provides an example of calculating the Hamiltonian on a mechanical system of an single object in simple harmonic motion and applying the Law of Conservation of Energy.
2022-11-16, ∼182🔥, 0💬

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