{"id":1232,"date":"2022-05-05T19:52:10","date_gmt":"2022-06-24T09:36:04","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1232"},"modified":"2022-07-31T15:43:04","modified_gmt":"2022-07-31T13:43:04","slug":"094-pierre-branlante","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/094-pierre-branlante\/","title":{"rendered":"094 – Pierre branlante"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Inversion du sens de rotation\u00a0\u00a0<\/strong><\/h2>\n

Introduction \u00e0:\u00a0<\/span><\/h2>\n

Moment cin\u00e9tique, conservation du moment cin\u00e9tique, couple de rotation\u00a0<\/span><\/p>\n

https:\/\/experiments.school\/wp-content\/uploads\/2022\/05\/Wackelstein-LSH.mp4<\/p>\n

 <\/p>\n

Mat\u00e9riel:\u00a0<\/span>\u00a0<\/span><\/h2>\n

Pierre celtique branlante en verre, disponible comme produit fini dans le commerce\u00a0<\/span>\u00a0<\/span><\/p>\n

Instructions:\u00a0<\/span>\u00a0<\/span><\/h2>\n
    \n
  • Pose la pierre branlante sur une surface plane et fais-la tourner rapidement.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
  • Recommence l’exp\u00e9rience, cette fois dans l’autre sens de rotation.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    Observation:\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • En tournant dans un sens, le corps en verre conserve son sens de rotation.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • En tournant dans l’autre sens, la rotation ralentit et s’arr\u00eate.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Un fort vacillement se produit alors.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Ensuite, il y a m\u00eame une rotation dans le sens inverse!\u00a0<\/span>\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Explication:\u00a0<\/span><\/h2>\n
        \n
      • Lors du d\u00e9hanchement, une force est transmise au support. En r\u00e9action, la pierre branlante subit un couple de rotation qui modifie son moment cin\u00e9tique. La conservation du moment angulaire n’est valable que pour un objet sur lequel aucune force n’est appliqu\u00e9e.\u00a0<\/span><\/li>\n
      • L’\u00e9nergie totale reste constamment la m\u00eame : l’\u00e9nergie de rotation initiale se transforme en \u00e9nergie cin\u00e9tique et potentielle lors du vacillement, puis \u00e0 nouveau en \u00e9nergie de rotation.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

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