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Research draft

rotation

vr.tr.rotation · ACT.ACT

Let an agent explain rotation in physics, engineering, astronomy and movement, compute rotational quantities, and separate specialised senses such as crop rotation and staff rotation.

Thing Registry Activities and processes

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain rotation in physics, engineering, astronomy and movement, compute rotational quantities, and separate specialised senses such as crop rotation and staff rotation.

Motion of a body around an axis or centre, including the spin of planets and stars, rotation of machine parts and wheels, rotational movements of the body such as cartwheels and joint rotation, aircraft rolls, and the tidal locking of moons; rotation is described by angular velocity and acceleration and governed by conservation of angular momentum.

What it is for: Describing turning motion.

It can be explain rotational kinematics and dynamics; compute angular velocity, torque and momentum; describe rotation of planets and machines; separate other senses of rotation.

Distinguishing features

Motion about an axis

Angular velocity and momentum

Conserved angular momentum

Ubiquitous

What it looks like

Turning motion about an axis.

How it is recognised

Motion around an axis

Angular quantities

Revolution around an external point is orbital motion

Related models

is a kind of - category

motion

is related to - angular velocity

vector quantity

is related to - other joint movement

flexion

is related to - tidal locking

eyeball planet

In practice

Families and kinds

rotation of rigid bodies

planetary and stellar rotation

rotation in machines

body and joint rotation

aerobatic rolls and gymnastics

Standards and regulation

SI units for angular quantities

Machine safety standards for rotating parts

Failure modes and hazards

Entanglement in rotating machinery

Confusing rotation and revolution

Frame and sign errors

Also called

cartwheelaileron rollself-propelled rolling motionmuscle rotationretrograde rotationtidal lockingclinorotationGivens rotation2D rotationinternal rotation of the foetal headrollsolar rotationpropeller walkrollingyawrotation upon itselfrotation around a fixed axisElectrorotationgyrationdifferential rotationInner core super-rotationAllais effectmuzzle riseRotation formalisms in three dimensionsslewMercury's rotationnutation

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Physics Rotational motion.

Angular quantities.

Kinematics

Angular velocity.

Kinematics

Kinematics.

  1. What are the angular velocity and acceleration of this rotating object? measurement
  2. How do linear and angular quantities relate? definition

Dynamics

Torque and momentum.

Dynamics

Dynamics.

  1. What torque and moment of inertia govern this rotation? measurement
  2. How is angular momentum conserved? definition
Astronomy Rotating bodies.

Planets and stars.

Planets

Planetary rotation.

Planets

Planetary rotation.

  1. What is the rotation period and axial tilt of this body, and is its rotation retrograde? provenance
  2. What is tidal locking? definition

Stars

Stellar rotation.

Stars

Stellar rotation.

  1. How fast do stars rotate, and how is it measured? provenance
  2. Why does rotation matter for stellar evolution? provenance
Machines Engineering.

Safety and design.

Design

Rotating machinery.

Design

Machinery.

  1. How are rotating parts balanced and specified? provenance
  2. Which units express machine speed? definition

Safety

Rotating hazards.

Safety

Safety.

  1. Which guarding and safety rules apply to rotating machinery? provenance
  2. Is there an entanglement hazard now? boundary
Senses Other senses.

Rotation has many uses.

Body

Body movement.

Body

Body movement.

  1. Is joint rotation, a cartwheel or a gymnastic rotation meant? boundary
  2. How is it performed safely? provenance

Other

Other meanings.

Other

Other meanings.

  1. Is crop rotation, staff rotation or a mathematical rotation meant? boundary
  2. Which entry fits? action

What the second pass must settle

  • Should angular momentum be a separate entry?
  • How should astronomy data be linked?
  • How should safety standards be linked?
Draft as JSON