{"id":1196,"date":"2022-05-05T15:20:57","date_gmt":"2022-06-24T09:53:09","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1196"},"modified":"2022-07-01T10:22:18","modified_gmt":"2022-07-01T08:22:18","slug":"165-bouncy-ball","status":"publish","type":"product","link":"https:\/\/experiments.school\/en\/product\/165-bouncy-ball\/","title":{"rendered":"165 – Bouncy Ball"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Elastic<\/span> bouncing<\/span> ball\u00a0<\/span><\/span>\u00a0<\/span><\/strong><\/h2>\n

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

Energy transformations, potential energy, kinetic energy, strain energy, elastic impact<\/span><\/p>\n[video width=\"1080\" height=\"1920\" mp4=\"https:\/\/experiments.school\/wp-content\/uploads\/2022\/05\/165-1.mp4\"][\/video]\n

<\/h2>\n

Material:\u00a0<\/span>\u00a0<\/span><\/h2>\n
    \n
  • Bouncy ball \/ tennis ball \/ elastic ball\u00a0<\/span>\u00a0<\/span><\/li>\n
  • yardstick \/ meter stick\u00a0<\/span>\u00a0<\/span><\/li>\n
  • Cell phone with video function \/ video camera\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

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

    We drop the ball in front of the yardstick from a height of about one meter onto a hard surface and let it bounce up several times. While doing this, we film the process in slow motion.\u00a0<\/span>\u00a0<\/span><\/p>\n

    Observation:\u00a0\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • The ball accelerates during free fall.\u00a0<\/span>\u00a0<\/span><\/li>\n
    • On impact, its velocity\u2019s direction reverses.\u00a0<\/span>\u00a0<\/span><\/li>\n
    • It moves upwards, then it slows down again and comes to a stop at the top for a short time.\u00a0<\/span>\u00a0<\/span><\/li>\n
    • In the slow motion video, and even better in a still image, the altitude of the ball can be read from the yardstick.\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Now the free fall begins again.\u00a0<\/span>\u00a0<\/span><\/li>\n
    • The altitude decreases after each bounce on the ground.\u00a0<\/span>\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Explanations:\u00a0\u00a0<\/span>\u00a0<\/span><\/h2>\n
        \n
      • The gravitational force acts downwards.\u00a0\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n
      • On impact, the ball is deformed elastically and experiences an upward push.\u00a0\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n
      • Now only the gravitational force acts until the next bounce.\u00a0<\/span>\u00a0<\/span><\/li>\n
      • From an energy standpoint, the potential energy of the ball is being transformed into kinetic energy bit by bit with each bounce.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
      • On impact, the kinetic energy is converted into strain energy, which is then converted back into kinetic energy, which is transformed into potential energy, back into kinetic energy and so on.\u00a0<\/span>\u00a0<\/span><\/li>\n
      • From the decreasing altitude, we can infer a loss of mechanical energy that occurs at each bounce.\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
      • When the ball is deformed, friction is created and thus thermal energy dissipates.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Didactic potential:\u00a0<\/span>\u00a0<\/span><\/h2>\n

        It is interesting to ask whether the same percentage of mechanical energy is lost at each bounce. This can be seen in the respective altitudes.<\/span>\u00a0<\/span><\/p>\n","protected":false},"featured_media":1400,"template":"","meta":[],"product_brand":[],"product_cat":[912,918,927,858],"product_tag":[],"class_list":{"0":"post-1196","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-4-velocity-acceleration-inertia","7":"product_cat-6-free-fall-fall-with-air-resistance","8":"product_cat-9-energy-forms-conservation-of-energy","9":"product_cat-a-mechanics","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\/1196","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\/1400"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media?parent=1196"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_brand?post=1196"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_cat?post=1196"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_tag?post=1196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}