lever
Let an agent explain the lever and its classes, relay physics and examples from mechanics references, describe levers in tools, vehicles and machines, and distinguish levers from other simple machines and from figurative uses of leverage.
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 the lever and its classes, relay physics and examples from mechanics references, describe levers in tools, vehicles and machines, and distinguish levers from other simple machines and from figurative uses of leverage.
A simple machine consisting of a rigid bar that pivots on a fulcrum to transmit and amplify force, classified into first, second and third class levers by the positions of fulcrum, load and effort, and embodied in tools and controls such as crowbars, bottle openers, pedals including automobile pedals, paddle shifters, railway track switch levers and the bierhobel beer tap handle; the lever is one of the classical simple machines described by Archimedes.
What it is for: Amplifying force or motion.
It can be explain classes and physics; relay examples; describe applications; distinguish related machines.
Distinguishing features
Rigid bar and fulcrum
Three classes
Mechanical advantage
Ubiquitous
What it looks like
A rigid bar pivoting on a fulcrum.
Physical character
classes: 3 count
mechanical advantage: effort arm divided by load arm formula
Archimedes: 3rd century BCE period - law of the lever
How it is recognised
Bar pivoting on a fulcrum
Crowbar, bottle opener, pedal, paddle shifter, track switch lever, bierhobel
A wheel and axle rotates; a pulley uses a rope; leverage in finance is figurative
Related models
is a kind of - in registry terms
is contrasted with - another simple machine
was analysed by - in the law of the lever
is exemplified by - a first class lever
In practice
Families and kinds
first class levers such as seesaws and crowbars
second class levers such as wheelbarrows and bottle openers
third class levers such as tweezers and the human forearm
control levers such as pedals, paddle shifters and track switch levers
levers in machines and instruments
Standards and regulation
No regulation; ergonomic and safety standards for control levers
Failure modes and hazards
Confusing lever classes
Registry aliases naming specific devices
Injuries from lever failure under load
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.lever
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a lever is.
Science.
Definition
Definition and classes.
Definition
Definition.
- What is a lever, and what are the three classes? definition
- Is the question about the physics, a device or figurative leverage? boundary
Physics
Physics.
Physics
Physics.
- How do torque and mechanical advantage govern levers? definition
- Which entry fits mechanical advantage? action
Devices Devices.
Practice.
Tools
Tools.
Tools
Tools.
- How do crowbars, bottle openers, pliers and the bierhobel use leverage? provenance
- Which references are standard? provenance
Controls
Controls.
Controls
Controls.
- How do pedals, paddle shifters and track switch levers work as controls? provenance
- Which sources are cited? provenance
Body Body and machines.
Science.
Anatomy
Levers in the body.
Anatomy
Anatomy.
- How do bones and muscles act as levers? provenance
- Which entry fits biomechanics? action
Machines
Levers in machines.
Machines
Machines.
- How are levers combined in linkages and machines? provenance
- Which entry fits linkage? action
Context History and language.
Context.
History
History.
History
History.
- How did Archimedes and later scientists analyse the lever? provenance
- Which entry fits the history of mechanics? action
Language
Figurative use.
Language
Language.
- How is leverage used figuratively in finance and negotiation? provenance
- Which entry fits leverage (finance)? action
What the second pass must settle
- Should pedal, paddle shifter and bottle opener be separate entries?
- How should mechanics references be linked?
- The registry entry has merged aliases naming specific devices; should they be split off?