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.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What a lever is.
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.
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.
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.
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
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- track switch, paddle shifter, bottle opener, pedal, automobile pedal, bierhobel, Beverage opener, pedal crank, effects pedal, secondary pedal, Husqvarna pedal, foot controller
What it is Filled
A simple machine consisting of a rigid bar that pivots on a fulcrum to transmit force, with the arrangement determining whether it provides greater output force or greater displacement or speed, 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.
Why it exists Filled
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.
Distinguishing features Filled
- Rigid bar and fulcrum
- Three classes
- Mechanical advantage
- Ubiquitous
What robots and AI may and may not do Filled
Must not
- Recommend using a lever beyond what the bar or fulcrum can bear.
- Advise prying open doors, locks or containers that belong to others.
- Operate control levers on machines the agent is not authorized to run.
- Misclassify a lever in teaching material.
Only with a human decision
- Using a lever to move a heavy load near people.
May
- Explain lever classes and the relation between fulcrum, load and effort.
- Calculate mechanical advantage for a described lever.
Moral aspects Filled
- Levers transmit force, sometimes amplifying it, and failure under load can injure the user and others.
- Control levers on machines decide the safety of people nearby.
Who is affected
- Users are affected.
- People near the load are affected.
- Students are affected.
Owners Filled
Steward
Nobody owns the principle; the person who uses a lever answers for its use.
Links to other meta-models Filled
parent
- Q186713 - registry parent class
related
- simple machine - in registry terms
- pulley - another simple machine
- Archimedes - in the law of the lever
- crowbar - a first class lever
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.lever
- Wikidata: Q40164 (https://www.wikidata.org/wiki/Q40164)
Direct properties required Filled
- classes: 3 count
- mechanical advantage: effort arm divided by load arm formula
- Archimedes: 3rd century BCE period - law of the lever
Recognition required Filled
- 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
- A rigid bar pivoting on a fulcrum.
Capabilities and actions required Filled
- explain classes and physics
- relay examples
- describe applications
- distinguish related machines
Hazards and failure modes required Filled
- Confusing lever classes
- Registry aliases naming specific devices
- Injuries from lever failure under load
Standards and interfaces required Filled
- No regulation; ergonomic and safety standards for control levers
Context of use required Filled
- Amplifying force or motion.
- 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
Sources Filled
- Wikidata item Q40164: lever - identity and sense of the item
- Wikipedia: Lever - general description of the item
Open questions
- 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?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q40164/spec.json