← Back to catalogue
Published

velocity

vr.tr.velocity · thing-q11465

Let an agent handle velocity by definition, calculation, frame of reference and applications, distinguishing it from speed.

Thing Registry Cross-cutting context XCT.QLT
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Quantity Definition.

Value

Magnitude and direction.

Value

Velocity value.

  1. What are the magnitude and direction of the velocity? measurement
  2. In which units? definition

Frame

Reference frame.

Frame

Reference frame.

  1. Relative to which frame is it measured? definition
  2. How does it change in another frame? measurement
Calculation Methods.

Average

Displacement over time.

Average

Average velocity.

  1. What is the average velocity over this interval? measurement
  2. How does it differ from average speed? definition

Instantaneous

Derivative.

Instantaneous

Instantaneous velocity.

  1. What is the instantaneous velocity at this time? measurement
  2. How is it derived? definition
Applications Uses.

Orbits

Orbital speed.

Orbits

Orbital velocity.

  1. What orbital velocity is needed at this altitude? measurement
  2. Which formula applies? definition

Waves

Phase and group.

Waves

Wave velocities.

  1. Is phase or group velocity meant? boundary
  2. How do they differ? definition
Teaching Learning.

Explain

Examples.

Explain

Explanation.

  1. How can velocity be explained with an everyday example? action
  2. Which diagram helps? action

Errors

Common mistakes.

Errors

Common mistakes.

  1. Is direction being ignored? boundary
  2. How can it be corrected? action

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.QLT
Other names and narrower kinds
Gravitsapa, phase velocity, orbital speed, sound particle velocity, peripheral velocity, sound wave velocity, molecule local average velocity, wind velocity, exhaust velocity, slower-than-light, climate velocity, train speed

What it is Filled

A vector quantity giving the rate of change of position of an object with respect to time, including both speed and direction, measured in metres per second; related quantities include phase velocity and orbital speed.

Why it exists Filled

Let an agent handle velocity by definition, calculation, frame of reference and applications, distinguishing it from speed.

Distinguishing features Filled

  • Vector quantity
  • Depends on reference frame
  • Derivative of position
  • Changes with acceleration

What robots and AI may and may not do Filled

Must not

  • Report speed without direction or frame where the difference matters.
  • Operate a vehicle or machine above a safe or permitted speed.
  • Track a person's speed and movement without consent or legal basis.
  • Mix up units, such as knots and kilometres per hour, in navigation or safety calculations.

Only with a human decision

  • Using velocity data as evidence against a person, such as for speeding.

May

  • Compute and report velocities with units and reference frame.
  • Read speed data from sensors the agent is authorized to use.

Moral aspects Filled

  • Speed kills on roads and at work; accurate measurement matters for safety.
  • Movement data reveals where people go.

Who is affected

  • Road users and pedestrians
  • Students and engineers

Owners Filled

Steward

Nobody: a physical quantity held in common.

Links to other meta-models Filled

parent

  • Q107715 - registry parent class
  • Q141256417 - registry parent class
  • Q2672914 - registry parent class
  • Q30337763 - registry parent class

related

  • vector quantity - category
  • position - relation
  • acceleration - relation
  • speed - scalar

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.velocity
  • Wikidata: Q11465 (https://www.wikidata.org/wiki/Q11465)
  • SI unit: metre per second (m/s) unit

Direct properties not applicable Not applicable

Not applicable

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Magnitude and direction
  • Units m/s, km/h
  • Speed is the magnitude only
  • Not visible; represented by arrows and numbers.

Capabilities and actions required Filled

  • compute velocity from displacement and time
  • distinguish velocity and speed
  • change frames of reference
  • convert units

Hazards and failure modes required Filled

  • Confusing speed and velocity
  • Ignoring frame of reference

Standards and interfaces required Filled

  • ISO 80000-3 space and time quantities

Context of use required Filled

  • Describing motion in physics and engineering.
  • instantaneous velocity
  • average velocity
  • relative velocity
  • angular velocity
  • phase and group velocity

Sources Filled

  1. Wikidata item Q11465: velocity - identity and sense of the item
  2. Wikipedia: Velocity - general description of the item

Open questions

  • Should kinds of velocity be separate entries?
  • How should relativistic velocity be linked?
  • How should wave velocities be split off?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q11465/spec.json