{"id": "card_works_free_fall", "kind": "verified", "title": "Free fall: how far in two seconds", "body": "Drop something from rest near Earth. Constant g = 9.8 m/s² carries it 19.6 m in two seconds — s = ½·a·t².  Worked & sealed by the engine — s = ½·g·t² = ½·9.8·2² = 19.6 m.  [HOLDS; open the seal to re-check.]", "source": {"label": "The Works — worked & sealed", "url": "https://narrowhighway.com/s/8ff54b9e2e56dca6a03a05c14d30e6947ac4596cfbd11947f257baa663387be0", "domain": "physics", "authority_tier": "verified"}, "shelf": "the-works", "box": "physical", "bands": ["the-works", "physical", "physics", "kinematics"], "connections": [{"to_card_id": "card_spine_the-works", "relationship": "member_of", "evidence": "a member of the the-works shelf in the keeping"}, {"to_card_id": "card_works_mechanics", "relationship": "kindred", "evidence": "A sibling worked demonstration in physics."}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "paves", "evidence": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality."}, {"to_card_id": "card_works_chemistry", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "subject": "Kinematics", "extra": {"seal_hash": "8ff54b9e2e56dca6a03a05c14d30e6947ac4596cfbd11947f257baa663387be0", "cite_url": "https://narrowhighway.com/s/8ff54b9e2e56dca6a03a05c14d30e6947ac4596cfbd11947f257baa663387be0", "demonstration_id": "works_free_fall", "verdict": "HOLDS"}, "presentation": {"glyph": "•", "kind_label": "physical", "by": "The Works — worked & sealed", "authority": "verified", "posted": "", "standing": "", "link": {"url": "https://narrowhighway.com/s/8ff54b9e2e56dca6a03a05c14d30e6947ac4596cfbd11947f257baa663387be0", "host": "narrowhighway.com", "provider": "", "titled": "Free fall: how far in two seconds", "waybill_line": "", "reach": "", "embed": ""}}, "neighbors": [{"id": "card_spine_the-works", "title": "The Works — sealed, worked demonstrations", "relationship": "on the shelf of", "why": "a member of the the-works shelf in the keeping", "href": "/card/card_spine_the-works", "resolved": true}, {"id": "card_works_mechanics", "title": "A 2 kg mass: the force to move it, the energy it carries", "relationship": "kindred", "why": "A sibling worked demonstration in physics.", "href": "/card/card_works_mechanics", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "paves", "why": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality.", "href": "/card/card_k_floor_of_discovery", "resolved": true}, {"id": "card_works_chemistry", "title": "Chemistry, two ways: will it run, and is it acid", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_chemistry", "resolved": true}]}