# transportation

Have you ever seen a parade? Have you ever been in a parade? A parade is basically a linear (1D) motion. It begins at a point with space and time and ends at a point with space and time. It is planned to progress in a certain order. The view from the side sees the …

## Places, spaces, and times

Time is like a river that flows on indefinitely, as observed from a place on its bank. The flow of time is downstream. Place does not change in this way but the time keeps changing. Space is like a river that flows on indefinitely, as observed from a platform floating down the river. The flow …

## Terminology contexts

This post continues the one here. While I avoid coining new terms or new definitions, some have been necessary. To have a consistent vocabulary, I try to imagine contexts in which they easily fit. Some words are simply variations of words in use: distime is like distance; dischronment is like displacement; chronation is like location; …

## Observers in motion

A rigid rod or other device that measures length is at rest relative to itself, even if part moves such as a measuring wheel (or surveyor’s wheel), because it moves relative to other objects, not relative to itself. A concept of simulstanceous enables an observer to determine length at other times (e.g., they are the …

## Moving bodies with space and time

Let us compare the motions of two bodies. Let the motion of one body be the reference motion. Let the motion of the other body be the target motion. Let the two bodies begin together at one place. Definitions: A place is the general term for an answer to Where? A point-place, or simply a …

## Transportation symmetry

An experimenter turns on a device and transmits a signal from point A to point B. Two people play catch and toss a ball from one at point A to the other at point B. A truck transports its cargo from the terminal at point A to the terminal at point B. All these are …

## Distance clock

A time clock is a device that measures a constant rate of internal motion. Time clocks are synchronized to a common event and rate of internal motion. A time clock is used by correlating its internal measure with other motions and events. There is a constant relationship between a time clock and a distance clock, …

## Mean speed and pace

Speed of a motion is the time rate of length change, that is, the length interval with respect to a timeline interval without regard to direction. Pace of a motion is the space rate of time change, that is, the time interval with respect to a baseline interval without regard to direction. The symbol for …

## Rest for space and time

Rest means no motion, or at least no motion detected by an observer. We know what rest for space means: staying in the same place. That is, rest means no change of position, no travel distance, no length of motion. So at rest the numerator of the speed is zero. Yet clocks tick on. The …

## Timelines and placelines

Events may be ordered in various ways (see here). Events ordered by time form a time line, or timeline, which is: 1. a linear representation of important events in the order in which they occurred. 2. a schedule; timetable. This may be generalized to the following definition: A time line is an ordering of events …