{
  "annotation_id": "fa20b2ea-99bf-4bbd-a1b8-342fe950dd17",
  "date_created": "2026-03-02T18:01:03.355000Z",
  "date_modified": "2026-03-02T18:01:03.355000Z",
  "file_hash": "267e5a13ad35fa6095336420c51a3c11a5946374a50a2764bed1754c228435bf",
  "private": false,
  "record": {
    "abstract": "The normal and the inverted pendulum continue to be one of the main physical\nmodels and metaphors in science. The inverted pendulum is also a classic study\ncase in control theory. In this paper we consider a special demonstration\nversion of the inverted pendulum which is controlled via a spring. If the\nspring constant is below a critical level the springy control will be unstable\nand the pendulum will be kept from falling only by exercising a dynamically\nvarying control. This situation resembles the case of human bipedal quiet\nstanding with the Achilles tendon serving as the spring. The paper is written\nwith physics students in mind.",
    "arxiv_id": "physics/0512122",
    "authors": [
      "Frank Borg"
    ],
    "categories": [
      "physics.bio-ph",
      "physics.ed-ph"
    ],
    "title": "An inverted pendulum with a springy control as a model of human standing",
    "url": "https://arxiv.org/abs/physics/0512122"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9ce50ccc-068d-4291-b570-a4c9a88b6252",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}