{"id":1231,"date":"2022-05-05T19:52:10","date_gmt":"2022-07-01T08:09:23","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1231"},"modified":"2022-07-31T15:43:33","modified_gmt":"2022-07-31T13:43:33","slug":"094-celtic-rattleback","status":"publish","type":"product","link":"https:\/\/experiments.school\/en\/product\/094-celtic-rattleback\/","title":{"rendered":"094 – Celtic Rattleback"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Reversing the direction of rotation\u00a0\u00a0<\/strong><\/h2>\n

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

angular momentum, conservation of angular momentum, torque.\u00a0<\/span>\u00a0<\/span><\/p>\n

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

 <\/p>\n

Material:\u00a0<\/span>\u00a0<\/span><\/h2>\n

Celtic rattleback made of glass, available as a ready-made product\u00a0<\/span><\/p>\n

Instructions:\u00a0<\/span>\u00a0<\/span><\/h2>\n
    \n
  • Place the rattleback on a flat surface and make it rotate rapidly.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
  • Perform the experiment again, this time turn it in the other direction (e.g. if the first run it rotated clockwise, now make it turn anti-clockwise).\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    Observation:\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • When spinning in one direction, the glass body retains its sense of rotation.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • When spinning in the other direction, the rotation slows down and comes to a standstill.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • A strong wobble occurs.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Subsequently, even a rotation in the opposite direction occurs!\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Explanation:\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/h2>\n
        \n
      • During the wobbling, a transfer of force to the base occurs. In reaction to this, the wobble stone experiences a torque which changes its angular momentum. Conservation of angular momentum applies only to an object on which there are no acting forces.\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n
      • The total energy remains the same all the time: Initial rotational energy is transformed into kinetic and potential energy during wobbling, and then back into rotational energy.\u00a0<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":1573,"template":"","meta":[],"product_brand":[],"product_cat":[933,858,880,879],"product_tag":[],"class_list":{"0":"post-1231","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-11-angular-momentum-conservation-of-angular-momentum","7":"product_cat-a-mechanics","8":"product_cat-g-magic-tricks-en","9":"product_cat-g-magic-tricks","10":"","11":"woocommerce-text-align-left","12":"woocommerce-image-align-center","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product\/1231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media\/1573"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media?parent=1231"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_brand?post=1231"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_cat?post=1231"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_tag?post=1231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}