Home Developers Evidence mechanical.statics.ladder_friction

Public evidence

mechanical.statics.ladder_friction

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

Open calculator API Capability Download JSON MCP Review policy

Verification

7/7 calculation tests · Production surface contract 6/6

  • Golden tests 3 / 3
  • Boundary tests 4 / 4
  • Property tests 0 / 0
  • Production surface contract 6 / 6
    • }
  • Engine tested Yes
  • Source checked Yes
  • Artifact integrity PASS
  • Production attestation Embedded snapshot: unpublished · Build schema 1.0.0 ready · Semantic contract ✓ · Attestation report not published on origin · Live production status STALE (6 capabilities; 189 remain CURRENT) @ 2026-09-23T14:00:05.385Z
  • Semantic contract PASS
  • Evidence attested at 2026-09-23T02:27:54.588Z
  • Last production check 2026-09-23T02:27:54.588Z
  • Public / cache —
  • Origin —
  • Supplemental domain review Not performed
  • Named expert review Not performed
  • release artifacts aligned PASS
  • schema output required declared PASS
  • schema valid input executes PASS
  • engine success output validates schema PASS
  • schema rejects incomplete input PASS
  • rest success payload validates schema PASS

Fingerprint sha256:104540251e29801fbd044fc76d345a2874113b5a642653e0c6d9d688f9be245d

Input schema sha256:89e03cf0828de9f11e3e3793e412da96d6e951ce8b2bf466c874f7d756fda22f · Output schema sha256:bad7c25025c3d3a25ae61660a48e24c5609e7a1c3ec034ea24a7ffd0eb3bcde5 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool
ladder-friction
Engine
ladder-friction
Engine build
2026-09-23
Evidence core
2026-09-23T12:19:51.658Z
Rendered
2026-09-23T14:21:08.537Z
Last reviewed
—

Limitations

  • The ladder is uniform and the weight acts at mid-length
  • The wall is smooth and the floor is rough
  • θ is the angle with the floor
  • Not a person on the ladder, a rough wall, a wedge, a screw, or a belt

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Published checks

Golden, boundary, and property cases included in this evidence build.

IDKindStatusDetail
golden-45goldenpassExpected mu_min=0.5 · N=100 · F=50 · B=50 · model=ladder_friction · Actual model=ladder_friction · W=100 · theta_deg=45 · N=100 · F=50 · B=50 · mu_min=0.5 · solver=friction + math.linear_algebra solve order 3
golden-60goldenpassExpected mu_min=0.2886751345948129 · N=100 · F=28.86751345948129 · B=28.86751345948129 · Actual model=ladder_friction · W=100 · theta_deg=60 · N=100 · F=28.8675134595 · B=28.8675134595 · mu_min=0.288675134595 · solver=friction + math.linear_algebra solve order 3
golden-30goldenpassExpected mu_min=0.8660254037844386 · N=200 · F=173.20508075688772 · B=173.20508075688772 · Actual model=ladder_friction · W=200 · theta_deg=30 · N=200 · F=173.205080757 · B=173.205080757 · mu_min=0.8660254037849999 · solver=friction + math.linear_algebra solve order 3
boundary-weightboundarypassExpected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
boundary-flatboundarypassExpected VALUE_OUT_OF_RANGE · Actual VALUE_OUT_OF_RANGE
boundary-verticalboundarypassExpected VALUE_OUT_OF_RANGE · Actual VALUE_OUT_OF_RANGE
boundary-angleboundarypassExpected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT