{"id":55126,"date":"2025-10-29T04:39:39","date_gmt":"2025-10-28T19:39:39","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=55126"},"modified":"2025-10-29T04:39:39","modified_gmt":"2025-10-28T19:39:39","slug":"planetary-power-in-your-hand-the-shocking-science-of-the-iron-rod-magnet","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=55126&lang=en","title":{"rendered":"Planetary Power in Your Hand: The Shocking Science of the Iron Rod Magnet"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\">I&#8217;m Ken Kuwako, a Science Trainer. Every Day is an Experiment!<\/span><\/p>\n<p>Imagine turning a plain iron rod into a magnet just by hitting it with a hammer\u2014wouldn&#8217;t you call that magic? I recently gave a lecture in Nagano Prefecture after being invited by the Physical and Chemical Society.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"K7IX5JIOMS\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=21950\">\u3010\u8b1b\u6f14\u3011\u9ed2\u677f\u3068\u30bf\u30d6\u30ec\u30c3\u30c8\u306e\u7d20\u6575\u306a\u51fa\u4f1a\u3044 \u301c\u3042\u308b\u7406\u79d1\u6559\u5e2b\u304c\u898b\u3064\u3051\u305f\u672a\u6765\u306e\u6388\u696d\u306e\u30ab\u30bf\u30c1\u301c\uff20\u9577\u91ce<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;\u3010\u8b1b\u6f14\u3011\u9ed2\u677f\u3068\u30bf\u30d6\u30ec\u30c3\u30c8\u306e\u7d20\u6575\u306a\u51fa\u4f1a\u3044 \u301c\u3042\u308b\u7406\u79d1\u6559\u5e2b\u304c\u898b\u3064\u3051\u305f\u672a\u6765\u306e\u6388\u696d\u306e\u30ab\u30bf\u30c1\u301c\uff20\u9577\u91ce&#8221; &#8212; \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=21950&#038;embed=true#?secret=zOG5ZSYhwh#?secret=K7IX5JIOMS\" data-secret=\"K7IX5JIOMS\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>While I was there, I saw another researcher&#8217;s presentation on this exact experiment: &#8220;Turn an iron rod into a magnet just by hammering it!&#8221; I was genuinely astonished. As soon as I got home, I had to try it myself, and sure enough, it really worked! The students were completely amazed, too, shouting, &#8220;No way!&#8221; when I demonstrated it for them. This is such a fascinating and educational experiment, so I&#8217;m excited to share it with you!<\/p>\n<h3>Make a Magnet with a Hammer! The &#8220;Geomagnetic Compass&#8221; Experiment<\/h3>\n<h3>What You&#8217;ll Need<\/h3>\n<p>An iron rod (about 50cm\/20 inches), a compass, a hammer<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-23000 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6881-1-300x225.jpg\" alt=\"IMG_6881 (1)\" width=\"300\" height=\"225\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6881-1-300x225.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6881-1-1024x768.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6881-1.jpg 1280w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<h3>Experiment Procedure<\/h3>\n<p>0. The Control: First, bring the iron rod close to the compass. The compass needle should barely move (or not move at all). This confirms the rod is not currently a magnet.<\/p>\n<p>1. Align with the Field: Hold one end of the iron rod and point the opposite end toward North. The key is to tilt the North-facing tip down toward the ground slightly. This aligns the rod with the direction of the Earth&#8217;s magnetic field (geomagnetism). (Check North with your compass, and then tilt the rod&#8217;s tip down as if it&#8217;s bowing.)<\/p>\n<p>2. Give it a Whack! Take the end you are holding (the South-facing end) and firmly strike it about three times with the hammer.<\/p>\n<p>3. Check for Magnetism (N-Pole): Bring the tip of the rod (the one you pointed North) close to the compass. What happens? The compass&#8217;s South pole should be attracted to the rod, confirming the tip is now the North pole of a magnet!<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22998 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6883-1-225x300.jpg\" alt=\"IMG_6883 (1)\" width=\"225\" height=\"300\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6883-1-225x300.jpg 225w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6883-1-768x1024.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6883-1.jpg 960w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>4. The Pole Reversal (Bonus Experiment): Now, point the newly-formed North pole end toward &#8220;South,&#8221; and the end you held in your hand toward &#8220;North.&#8221; Strike the new South-facing end again. Bring the end that was just the N-pole near the compass&#8230; This time, the compass&#8217;s North pole should be attracted to it, meaning the rod has reversed polarity and is now the S-pole (or it repels the N-pole, which is also correct)!<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22997 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6884-1-225x300.jpg\" alt=\"IMG_6884 (1)\" width=\"225\" height=\"300\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6884-1-225x300.jpg 225w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6884-1-768x1024.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6884-1.jpg 960w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>5. Demagnetization: Finally, point the iron rod East-West (a direction not aligned with the Earth&#8217;s magnetic field) and strike it several times in the same way. You should observe that the rod&#8217;s magnetic field weakens (it becomes demagnetized).<\/p>\n<p>That&#8217;s the experiment!<\/p>\n<h3>The Secret Revealed: Why Does Hammering Create a Magnet?<\/h3>\n<p>Why does striking the rod with a hammer (applying a vibration) cause it to become magnetized?<\/p>\n<p>The truth is, iron is full of countless, tiny &#8220;seeds of magnetism&#8221;\u2014which are technically called &#8220;magnetic domains.&#8221; Normally, these domains are pointing in random directions, canceling each other&#8217;s magnetic forces out. This leaves the iron rod with no overall magnetic power. (This is the state in Procedure 0.)<\/p>\n<p>However, when you orient the iron rod in the direction of the Earth&#8217;s magnetic field (geomagnetism) and give it a strong, sharp hit with the hammer (applying vibration), the randomly oriented magnetic domains become loosened and easier to move. Guided by the Earth&#8217;s magnetic force, they all snap into alignment in the same direction!<\/p>\n<p>When the magnetic domains align, the entire iron rod suddenly possesses magnetic power. That&#8217;s how it works!<\/p>\n<h3>The Earth is a Giant Magnet<\/h3>\n<p>The planet we live on, Earth, is itself a massive magnet. (That&#8217;s why a compass needle points North!) This experiment essentially involves using the Earth&#8217;s invisible magnetic force (geomagnetism) to align the tiny magnets within the iron rod.<\/p>\n<p>This is also why, as shown in Procedure 5, striking the rod while pointing it East-West (a direction unrelated to the Earth&#8217;s magnetic field) causes the aligned magnetic domains to become scrambled again, weakening the magnetization.<\/p>\n<p>You might find it hard to believe that &#8220;the Earth&#8217;s magnetic field can do that!&#8221; But it really works. It\u2019s an incredibly cool and thought-provoking experiment that connects an ordinary iron rod in your hand to a planetary-scale force. Be sure to try it at home!<\/p>\n<h3>Inquiries and Requests<\/h3>\n<p>I&#8217;m here to bring the wonder and fun of science closer to you! I put together easy-to-understand explanations of exciting, at-home science experiments and tips. Feel free to explore and search for more!<\/p>\n<p>The content from this science blog is now available as a book. Find out more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a>.<\/p>\n<p>Learn more about the administrator, Ken Kuwako, <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a>.<\/p>\n<p>For various requests (writing, lectures, science workshops, TV supervision, appearances, etc.), click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a>. <span class=\"s2\">&#8211; Updates on articles are posted on <a href=\"https:\/\/x.com\/kuwako\">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>We post experiment videos on the <a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Neta Channel<\/a>!<\/p>\n<h3>\uff14\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<ul>\r\n \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?p=46937&amp;\">\u5149\u306e\u9b54\u6cd5CMY\u30a6\u30a9\u30fc\u30bf\u30fc\u30ad\u30e5\u30fc\u30d6<\/a>\uff1a\u5149\u306e\u9b54\u6cd5\u3092\u4f53\u9a13\u305b\u3088\uff01\u6c34\u3092\u6ce8\u3050\u3068\u65b0\u305f\u306a\u7acb\u65b9\u4f53\u304c\u51fa\u73fe\u3059\u308b\u9b54\u6cd5\u306e\u3088\u3046\u306a\u5b9f\u9a13\u3067\u3059\u3002<\/li>\r\n<\/ul>\r\n<img class=\"alignnone wp-image-47312 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/12\/71274840332ac4ee4620fb1475a1d79c.jpg\" sizes=\"auto, (max-width: 267px) 100vw, 267px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/12\/71274840332ac4ee4620fb1475a1d79c.jpg 1292w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/12\/71274840332ac4ee4620fb1475a1d79c-272x300.jpg 272w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/12\/71274840332ac4ee4620fb1475a1d79c-928x1024.jpg 928w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/12\/71274840332ac4ee4620fb1475a1d79c-768x848.jpg 768w\" alt=\"\" width=\"267\" height=\"294\" \/>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u30fb\u79d1\u5b66\u76e3\u4fee\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n \t<li>4\u67089\u65e5\uff08\u6728\uff09\u300cTHE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb\u300d\uff08\u65e5\u672c\u30c6\u30ec\u30d3 \uff09\u306e\u79d1\u5b66\u76e3\u4fee\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u591c7\u6642\u301c\u3068\u306a\u308a\u307e\u3059\u3002<\/li>\r\n<\/ul>\r\n<h3><span style=\"font-size: medium;\"><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?p=61585\">\u30b5\u30af\u30bb\u30b915 \uff14\u6708\u53f7<\/a>\u306b\u3066\u3001\u91ce\u7403\u306e\u79d1\u5b66\u306b\u3064\u3044\u3066\u8a18\u4e8b\u3092\u57f7\u7b46\u3057\u307e\u3057\u305f\uff082026\/3\uff09<\/li>\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\" \/>\r\n<\/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=\"font-size: medium;\"><b>\u8b1b\u5e2b\u30fb\u30b7\u30e7\u30fc\u30fb\u7814\u7a76\u7b49\u306e\u304a\u77e5\u3089\u305b<\/b><\/span><\/h3>\r\n<ul>\r\n \t<li>3\/20\uff08\u91d1\uff09\u3000\u65e5\u672c\u7406\u79d1\u6559\u80b2\u5b66\u4f1a\u30aa\u30f3\u30e9\u30a4\u30f3\u5168\u56fd\u5927\u4f1a2026\u300c<a href=\"https:\/\/phys-edu.net\/wp\/?p=60439\">\u6163\u6027\u306e\u6cd5\u5247\u306e\u6982\u5ff5\u5f62\u6210\u3092\u76ee\u6307\u3057\u305f\u63a2\u7a76\u7684\u306a\u5b66\u3073\u306e\u5b9f\u8df5\u300d<\/a>\u306b\u3064\u3044\u3066\u767a\u8868\u3057\u307e\u3057\u305f\u3002<\/li>\r\n \t<li>6\/14\uff08\u65e5\uff09\u3000\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n \t<li>7\/18\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n \t<li>10\/10\uff08\u571f\uff09\u3000\u79d8\u5bc6\u5175\u5668\u300c\u5e2f\u96fb\u30ac\u30f3\u300d\u304c\u70b8\u88c2\uff01\u30d3\u30ea\u30d3\u30ea\uff01\u30c9\u30ad\u30c9\u30ad\uff01\u9759\u96fb\u6c17\u30b5\u30a4\u30a8\u30f3\u30b9\u30b7\u30e7\u30fc\uff20\u5343\u8449\u5e02\u79d1\u5b66\u30d5\u30a7\u30b9\u30bf\uff08\u5348\u5f8c\u4e88\u5b9a\uff09<\/li>\r\n \t<li><span style=\"text-align: center;\">\u5404\u7a2eSNS\u3000<\/span><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><span style=\"text-align: center;\">\uff0f<\/span><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><\/li>\r\n<\/ul>\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 href=\"https:\/\/www.youtube.com\/c\/kkuwako\">Youtube<\/a>\u2026\u79d1\u5b66\u5b9f\u9a13\u7b49\u306e\u52d5\u753b\u3092\u914d\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n \t<li><a href=\"https:\/\/music.youtube.com\/playlist?list=PLoK4ZvKN9S2NgpYIochcQs0aL-vrRB_Qw\">\u79d1\u5b66\u30e9\u30b8\u30aa<\/a>\u00a0\u2026\u79d1\u5b66\u30c8\u30d4\u30c3\u30af\u3092\u307b\u307c\u6bce\u65e5\u914d\u4fe1\u4e2d\uff01AI\u6280\u8853\u3092\u99c6\u4f7f\u3057\u3066\u4f5c\u6210\u3057\u305f\u300c\u8033\u3067\u697d\u3057\u3080\u79d1\u5b66\u300d\u3092\u304a\u5c4a\u3051\u3057\u307e\u3059\u3002<\/li>\r\n \t<li><a href=\"http:\/\/phys-edu.net\/wp\/?page_id=20940\">\u8b1b\u6f14<\/a>\u00a0\u2026\u5168\u56fd\u5404\u5730\u3067\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u30fb\u30b5\u30a4\u30a8\u30f3\u30b9\u30b7\u30e7\u30fc\u7b49\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/li>\r\n \t<li><a 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>\r\n<ul class=\"wp-block-latest-posts__list is-grid columns-3 has-dates wp-block-latest-posts\"><li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62891&#038;lang=ko\" aria-label=\"\uba48\ucd98 \ub4ef\ud558\uc9c0\ub9cc \ub2e4\uac00\uc624\uace0 \uc788\ub2e4? &#8216;\ucf5c\ub9ac\uc804 \ucf54\uc2a4&#8217; \ud604\uc0c1\uc758 \uacf5\ud3ec\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62891&#038;lang=ko\">\uba48\ucd98 \ub4ef\ud558\uc9c0\ub9cc \ub2e4\uac00\uc624\uace0 \uc788\ub2e4? &#8216;\ucf5c\ub9ac\uc804 \ucf54\uc2a4&#8217; \ud604\uc0c1\uc758 \uacf5\ud3ec<\/a><time datetime=\"2026-04-30T04:31:27+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62889&#038;lang=es\" aria-label=\"\u00bfInm\u00f3vil o en rumbo de colisi\u00f3n? El peligro invisible de la velocidad relativa\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62889&#038;lang=es\">\u00bfInm\u00f3vil o en rumbo de colisi\u00f3n? El peligro invisible de la velocidad relativa<\/a><time datetime=\"2026-04-30T04:30:54+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62887&#038;lang=hi\" aria-label=\"\u0938\u094d\u0925\u093f\u0930 \u092a\u0930 \u091c\u093e\u0928\u0932\u0947\u0935\u093e: \u0915\u094b\u0932\u093f\u091c\u0928 \u0915\u094b\u0930\u094d\u0938 \u0915\u093e \u0916\u0924\u0930\u0928\u093e\u0915 \u0938\u091a\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62887&#038;lang=hi\">\u0938\u094d\u0925\u093f\u0930 \u092a\u0930 \u091c\u093e\u0928\u0932\u0947\u0935\u093e: \u0915\u094b\u0932\u093f\u091c\u0928 \u0915\u094b\u0930\u094d\u0938 \u0915\u093e \u0916\u0924\u0930\u0928\u093e\u0915 \u0938\u091a<\/a><time datetime=\"2026-04-30T04:30:07+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62885&#038;lang=zh\" aria-label=\"\u770b\u4f3c\u975c\u6b62\u537b\u5728\u903c\u8fd1\uff1f\u4ee4\u4eba\u6bdb\u9aa8\u609a\u7136\u7684\u300c\u78b0\u649e\u8def\u7dda\u300d\u73fe\u8c61\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62885&#038;lang=zh\">\u770b\u4f3c\u975c\u6b62\u537b\u5728\u903c\u8fd1\uff1f\u4ee4\u4eba\u6bdb\u9aa8\u609a\u7136\u7684\u300c\u78b0\u649e\u8def\u7dda\u300d\u73fe\u8c61<\/a><time datetime=\"2026-04-30T04:28:59+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62882&#038;lang=fi\" aria-label=\"Se n\u00e4ytt\u00e4\u00e4 seisovan, mutta l\u00e4hestyy \u2013 T\u00f6rm\u00e4yskurssin hyyt\u00e4v\u00e4 vaara\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62882&#038;lang=fi\">Se n\u00e4ytt\u00e4\u00e4 seisovan, mutta l\u00e4hestyy \u2013 T\u00f6rm\u00e4yskurssin hyyt\u00e4v\u00e4 vaara<\/a><time datetime=\"2026-04-30T04:25:30+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62880&#038;lang=en\" aria-label=\"Frozen in Sight, Racing to Impact: The Terror of the Collision Course\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/08\/74ff8b011a242f6fb7ea0802cb36c952-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62880&#038;lang=en\">Frozen in Sight, Racing to Impact: The Terror of the Collision Course<\/a><time datetime=\"2026-04-30T04:24:38+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=39867\" aria-label=\"\u82b1\u3073\u3089\u306f\u672c\u5f53\u306b6\u679a\uff1f\u8eab\u8fd1\u306a\u30c1\u30e5\u30fc\u30ea\u30c3\u30d7\u3067\u63a2\u308b\u690d\u7269\u306e\u30eb\u30fc\u30eb\uff08\u690d\u7269\u56f3\u9451\uff09\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/04\/dad12b44e48bbe3ab6fd4da3be301101-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=39867\">\u82b1\u3073\u3089\u306f\u672c\u5f53\u306b6\u679a\uff1f\u8eab\u8fd1\u306a\u30c1\u30e5\u30fc\u30ea\u30c3\u30d7\u3067\u63a2\u308b\u690d\u7269\u306e\u30eb\u30fc\u30eb\uff08\u690d\u7269\u56f3\u9451\uff09<\/a><time datetime=\"2026-04-30T04:12:48+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=34400\" aria-label=\"\uff0b\u3068\u2212\u3067\u306a\u305c\u9006\uff1f\u30db\u30fc\u30eb\u52b9\u679c\u306e\u30e2\u30e4\u30e2\u30e4\u3092\u4e00\u6c17\u306b\u89e3\u6c7a\uff01\uff08\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\uff09\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/01\/d0f315698bba7db67a7a11d57ad88e85-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=34400\">\uff0b\u3068\u2212\u3067\u306a\u305c\u9006\uff1f\u30db\u30fc\u30eb\u52b9\u679c\u306e\u30e2\u30e4\u30e2\u30e4\u3092\u4e00\u6c17\u306b\u89e3\u6c7a\uff01\uff08\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\uff09<\/a><time datetime=\"2026-04-30T04:00:25+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670830\u65e5<\/time><\/li>\n<li><div class=\"wp-block-latest-posts__featured-image\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=62870&#038;lang=fi\" aria-label=\"Paljasta n\u00e4kym\u00e4t\u00f6n voima! Tasapainon 3 ehtoa kokeellisesti \u2013 keski\u00f6ss\u00e4 suora vaikutusviiva.\"><img width=\"150\" height=\"150\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/10\/0c363943316a3a32b1e6d1e43ff96e38-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" style=\"\" \/><\/a><\/div><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/phys-edu.net\/wp\/?p=62870&#038;lang=fi\">Paljasta n\u00e4kym\u00e4t\u00f6n voima! Tasapainon 3 ehtoa kokeellisesti \u2013 keski\u00f6ss\u00e4 suora vaikutusviiva.<\/a><time datetime=\"2026-04-29T05:20:36+09:00\" class=\"wp-block-latest-posts__post-date\">2026\u5e744\u670829\u65e5<\/time><\/li>\n<\/ul>&nbsp;","protected":false},"excerpt":{"rendered":"<p>I&#8217;m Ken Kuwako, a Science Trainer. Every Day is an Experiment! Imagine turning a plain iron rod into a m [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":22998,"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":""},"categories":[781],"tags":[],"class_list":["post-55126","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2015\/10\/IMG_6883-1.jpg","jetpack-related-posts":[{"id":51207,"url":"https:\/\/phys-edu.net\/wp\/?p=51207&lang=en","url_meta":{"origin":55126,"position":0},"title":"Dynamic Chemistry Experiment: The Thermite Reaction, a Lesson in Oxidation-Reduction and Exothermic Processes (Aluminum Steals Oxygen!","author":"\u6851\u5b50 \u7814","date":"2025\u5e748\u670826\u65e5","format":false,"excerpt":"I'm Ken Kuwako, a science trainer. Every day is an\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":61214,"url":"https:\/\/phys-edu.net\/wp\/?p=61214&lang=en","url_meta":{"origin":55126,"position":1},"title":"Can Iron Turn Into a Magnet!? Explore the Mysterious World of Magnetic Permeability with the \u201cPitland\u201d Experiment","author":"\u6851\u5b50 \u7814","date":"2026\u5e743\u67087\u65e5","format":false,"excerpt":"I am Ken Kuwako, a science trainer. Every day is a\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/11\/5ecdd55af72b340ca87f7887febdab98.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/11\/5ecdd55af72b340ca87f7887febdab98.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/11\/5ecdd55af72b340ca87f7887febdab98.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/11\/5ecdd55af72b340ca87f7887febdab98.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":55743,"url":"https:\/\/phys-edu.net\/wp\/?p=55743&lang=en","url_meta":{"origin":55126,"position":2},"title":"The Dancing Magnet: How to Listen to AC Current&#8217;s Secret Sound","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u670811\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer. Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/729850cf65f106620da55e45ae23384b.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":52085,"url":"https:\/\/phys-edu.net\/wp\/?p=52085&lang=en","url_meta":{"origin":55126,"position":3},"title":"Explosive Chemistry in Action! Learn Redox and Heat Through the Thermite Reaction (Aluminum Steals Oxygen!)","author":"\u6851\u5b50 \u7814","date":"2026\u5e742\u67084\u65e5","format":false,"excerpt":"I am Ken Kuwako, your Science Trainer. Every day i\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/06\/ddd78310fbbc40cb5a29858945c10335.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":55813,"url":"https:\/\/phys-edu.net\/wp\/?p=55813&lang=en","url_meta":{"origin":55126,"position":4},"title":"Magnet Tricks: Making Dandelions Bloom with the Invisible Hand of Science","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u670812\u65e5","format":false,"excerpt":"I'm Kuwako Ken, your Science Trainer. Every day is\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/8a970c30b51abe84a8448ded74c5a9ab.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":55619,"url":"https:\/\/phys-edu.net\/wp\/?p=55619&lang=en","url_meta":{"origin":55126,"position":5},"title":"Why Does the Magnet Stop It? Unveiling the Secret of \u201cChange-Hating Electricity\u201d with a Coil Swing Experiment!","author":"\u6851\u5b50 \u7814","date":"2025\u5e7411\u67089\u65e5","format":false,"excerpt":"I'm Ken Kuwako, Science Trainer. Every day is an e\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/addf2aebe79651e48b6a50a018791333.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts\/55126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=55126"}],"version-history":[{"count":0,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/posts\/55126\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=\/wp\/v2\/media\/22998"}],"wp:attachment":[{"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=55126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=55126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phys-edu.net\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=55126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}