{"id":66710,"date":"2026-08-21T04:55:40","date_gmt":"2026-08-20T19:55:40","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=66710"},"modified":"2026-08-21T04:55:40","modified_gmt":"2026-08-20T19:55:40","slug":"is-this-spring-alive-the-physics-behind-its-caterpillar-crawl-down-the-stairs","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=66710&lang=en","title":{"rendered":"Is This Spring Alive? The Physics Behind Its Caterpillar Crawl Down the Stairs"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I&#8217;m Ken Kuwako, your Science Trainer. Every day is an experiment!<\/strong><\/span><\/p>\n<p>Have you ever seen what happens when a child gently drops a long plastic spring, or Slinky, from the top of a staircase? Instead of simply tumbling down, the spring slowly works its way down the stairs, one step at a time, almost as if it were a living creature with a mind of its own. It was so fascinating that I decided to take a closer look.<\/p>\n<p>And what I found was surprisingly mesmerizing. Take a look at the video below.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u751f\u304d\u7269\u306e\u3088\u3046\u306b\u52d5\u304f\u300c\u30d0\u30cd\u300d\u304c\u9762\u767d\u3044!!\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/QWSObo5zXOs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Doesn&#8217;t it look almost like a snake or caterpillar crawling down the stairs, one step at a time? Just when you think it has dropped down one step, the very end stretches out and reaches the next step, and then the rest of the spring is pulled forward to catch up. This strange and captivating motion is actually packed with <b>the laws of physics<\/b>.<\/p>\n<h3>The Secret Behind Its Caterpillar-Like Movement: Shifting the Center of Gravity<\/h3>\n<p>If you watch the spring carefully, you&#8217;ll notice that its entire body doesn&#8217;t fall all at once. Instead, <b>the back end, or upper part, contracts and is pulled forward<\/b>, and then <b>the whole spring drops onto the next step<\/b>. This sequence repeats over and over.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-66707 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.15.jpeg\" alt=\"\" width=\"298\" height=\"349\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.15.jpeg 522w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.15-256x300.jpeg 256w\" sizes=\"auto, (max-width: 298px) 100vw, 298px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-66708 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.25.jpeg\" alt=\"\" width=\"296\" height=\"281\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.25.jpeg 646w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/12\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-08-21-4.35.25-300x284.jpeg 300w\" sizes=\"auto, (max-width: 296px) 100vw, 296px\" \/><\/p>\n<p>This movement is surprisingly similar to the way some animals move. Caterpillars and inchworms move forward by contracting the rear part of their bodies, extending the front, and then pulling the rear forward. The spring works in a similar way. Part of the coil contracts, shifting its center of gravity forward and downward, and the rest of the spring is then pulled along.<\/p>\n<p>It&#8217;s fascinating to think that the same basic physical principles can be found both in the &#8220;walking&#8221; movements of living creatures and in the motion of an ordinary plastic coil.<\/p>\n<h3>Let&#8217;s Follow the Energy Transformations<\/h3>\n<p>From a physics perspective, the spring&#8217;s movement involves a fascinating sequence of energy transformations.<\/p>\n<p>At the top of the staircase, the spring has <b>gravitational potential energy<\/b>. The higher an object is, the more gravitational potential energy it has.<\/p>\n<p>As the spring begins to fall, parts of the coil contract and stretch. Some of the gravitational potential energy is converted into <b>elastic potential energy<\/b>, which is the energy stored due to the spring&#8217;s elasticity. It&#8217;s the same basic principle that makes a stretched rubber band or spring want to return to its original shape.<\/p>\n<p>Then, when the compressed spring begins to spring back toward its original shape, the stored elastic energy is released rapidly and converted into <b>kinetic energy<\/b>. This is what causes one part of the spring to suddenly shoot forward toward the next step.<\/p>\n<p>In other words, as the spring makes its way down the staircase, it repeatedly goes through a cycle like this:<\/p>\n<p>Gravitational potential energy \u2192 Elastic potential energy \u2192 Kinetic energy \u2192 (then, on the next step) Gravitational potential energy\u2026\u2026<\/p>\n<p>It&#8217;s almost like an energy relay race. The cycle repeats with every step, which is why the spring appears to move forward one deliberate &#8220;step&#8221; at a time, almost like a living creature.<\/p>\n<h3>The Physics of the Slinky Even Made Waves in Space<\/h3>\n<p>As a little side note, the Slinky has actually attracted plenty of attention in the world of physics. There is a famous experiment in which a Slinky is held vertically, with its lower end supported by your hand, and then the upper end is released so that it can fall freely.<\/p>\n<p>You might expect the entire spring to start falling simultaneously the moment you let go. But that&#8217;s not what happens. In reality, <b>the lower end remains almost completely still for a while<\/b>. It doesn&#8217;t begin to fall until the upper end has contracted and caught up with it.<\/p>\n<p>This happens because the force generated as the upper part of the spring contracts has not yet been fully transmitted to the lower part. It&#8217;s a wonderfully insightful experiment because you can actually see with your own eyes that <b>forces do not travel instantaneously<\/b>.<\/p>\n<p>The Slinky falling down the stairs can be thought of as another example of this same phenomenon. Once you realize that the fascinating motion is partly caused by a &#8220;time lag&#8221; before the force is transmitted through the spring, you can appreciate the movement from a whole new perspective.<\/p>\n<h3>Contact and Collaboration<\/h3>\n<p>Let&#8217;s bring the wonder and excitement of science a little closer to home! I share fun science experiments you can try at home, along with simple tips to help you get the most out of them. Have a look around and see what you can discover!<\/p>\n<p>\u30fbThe Science Notebook has been turned into a book. Find out more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a><br \/>\n\u30fbLearn more about Ken Kuwako, the creator of this site, <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a><br \/>\n\u30fbFor inquiries and collaboration requests, including writing, lectures, science workshops, TV supervision, and appearances, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a><br \/>\n<span class=\"s2\">\u30fbFor updates and new articles, follow me <a href=\"https:\/\/x.com\/kuwako\">on X<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">The Science Notebook Channel<\/a> features videos of fun science experiments!<\/p>\n<h3><span style=\"color: #ff0000;\">NEW\u3000\u5206\u89e3\u554f\u984c\u96c6\u3000\u7406\u79d1<\/span><\/h3>\r\n<ul>\r\n \t<li>\uff17\u6708\uff12\uff11\u65e5\u767a\u58f2\uff01\u300e<a href=\"https:\/\/phys-edu.net\/wp\/?p=64462\">\u9ad8\u6821\u5165\u8a66 \u5206\u89e3\u554f\u984c\u96c6 \u7406\u79d1<\/a>\u300f\uff08\u5b66\u7814\uff09\u2026\u96e3\u3057\u3044\u554f\u984c\u3082\u5c0f\u3055\u306a\u554f\u984c\u306b\u5206\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3093\u306a\u5206\u89e3\u306e\u6280\u8853\u304c\u8eab\u306b\u3064\u304f\u3088\u3046\u306b\u6df1\u304f\u95a2\u308f\u308a\u3092\u6301\u3063\u3066\u4f5c\u308a\u307e\u3057\u305f\u3002\r\n<a href=\"https:\/\/phys-edu.net\/wp\/?p=64462\"><img class=\"alignnone  wp-image-65097 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-04-8.40.17.jpeg\" alt=\"\" width=\"172\" height=\"244\" \/><\/a><\/li>\r\n<\/ul>\r\n<h3>\uff17\u30fb\uff18\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p style=\"text-align: center;\">\u590f\u3067\u30d7\u30b7\u30e5\u30c3\u3068\u723d\u3084\u304b\u5b9f\u9a13\uff01<\/p>\r\n<img class=\"alignnone  wp-image-64964 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-06-30-4.31.58.jpeg\" alt=\"\" width=\"250\" height=\"310\" \/>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=206\">\u5c0f\u578b\u3067\u6301\u3061\u5e30\u308c\u308b\u3088\uff01\u30da\u30c3\u30c8\u30dc\u30c8\u30eb\u30ed\u30b1\u30c3\u30c8\u3092\u4f5c\u308d\u3046\uff01<\/a><\/p>\r\n\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n \t<li>\uff17\u6708\uff13\uff10\u65e5\uff08\u6c34\uff09\u79d1\u5b66\u76e3\u4fee\u300c<a href=\"https:\/\/www.fujitv.co.jp\/onesongfes\/\">TIF presents ONE SONG FES<\/a>\u300d\uff08\u30d5\u30b8\u30c6\u30ec\u30d3\uff09\u00a026:15~27:15<\/li>\r\n \t<li>12\u670826\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=64825\">\u30ca\u30ea\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\uff08\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\uff09\u958b\u50ac<\/a><\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n \t<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09\r\n<img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><\/strong><\/li>\r\n \t<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002\r\n<img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 300w\" alt=\"\" width=\"184\" height=\"165\" \/><\/li>\r\n<\/ul>\r\n<h3><span style=\"text-align: center;\">\u5404\u7a2eSNS\uff08\u66f4\u65b0\u60c5\u5831\u3092\u304a\u5c4a\u3051\uff01\uff09<\/span><\/h3>\r\n<p style=\"text-align: center;\">\u3010\u65e5\u672c\u8a9e\u3011<a style=\"text-align: center;\" href=\"https:\/\/twitter.com\/kuwako\">X(Twitter)<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.instagram.com\/science_seeds\/\">instagram<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.facebook.com\/kuwakolab\/\">Facebook<\/a>\u3000\u3010\u82f1\u8a9e\u3011<a style=\"text-align: center;\" href=\"https:\/\/bsky.app\/profile\/kagakunoneta.bsky.social\">BlueSky<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.threads.net\/@science_seeds?hl=ja\">Threads<\/a><\/p>\r\n\r\n<h3 style=\"text-align: center;\"><strong>Explore<\/strong><\/h3>\r\n<ul>\r\n \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=30764\">\u697d\u3057\u3044\u5b9f\u9a13<\/a>\u2026\u304a\u5b50\u3055\u3093\u3068\u4e00\u7dd2\u306b\u5922\u4e2d\u306b\u306a\u308c\u308b\u30a4\u30c1\u30aa\u30b7\u306e\u79d1\u5b66\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u9ad8\u6821\u7269\u7406\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306e\u52d5\u753b\u6559\u6750\u3082\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/li>\r\n \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=798\">\u7406\u79d1\u306e\u6559\u6750<\/a>\u2026 \u7406\u79d1\u6559\u5e2b\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\uff01\u6388\u696d\u306e\u8cea\u3092\u9ad8\u3081\u3001\u6e96\u5099\u3092\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u306e\u9078\u308a\u3059\u3050\u308a\u306e\u6559\u6750\u3092\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n \t<li><a 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href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a>\u00a0\u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>I&#8217;m Ken Kuwako, your Science Trainer. Every day is an experiment! Have you ever seen what happens when a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":38536,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":"","jetpack_post_was_ever_published":false},"categories":[781],"tags":[],"class_list":["post-66710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack-related-posts":[{"id":57807,"url":"https:\/\/phys-edu.net\/wp\/?p=57807&lang=en","url_meta":{"origin":66710,"position":0},"title":"When Your Fridge Becomes a Lab: The Fascinating World of Standing Waves Drawn with Springs and Magnets","author":"\u6851\u5b50 \u7814","date":"2025\u5e7412\u670825\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your science trainer. 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