{"id":55072,"date":"2025-10-28T04:31:52","date_gmt":"2025-10-27T19:31:52","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=55072"},"modified":"2025-10-28T04:31:52","modified_gmt":"2025-10-27T19:31:52","slug":"why-a-heavy-bowling-ball-floats-and-a-golf-ball-sinks-the-surprising-science-of-density","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=55072&lang=en","title":{"rendered":"Why a Heavy Bowling Ball Floats (and a Golf Ball Sinks): The Surprising Science of Density"},"content":{"rendered":"<p style=\"text-align: center;\"><strong style=\"color: #339966;\">I&#8217;m Ken Kuwako, a Science Trainer. Every day is an experiment.<\/strong><\/p>\n<h3>The Great Ball Float-or-Sink Challenge!<\/h3>\n<p><span style=\"font-size: 14px;\">For this challenge, we&#8217;ve gathered four types of balls: a <\/span><b style=\"font-size: 14px;\">golf ball<\/b><span style=\"font-size: 14px;\">, a <\/span><b style=\"font-size: 14px;\">lacrosse ball<\/b><span style=\"font-size: 14px;\">, a <\/span><b style=\"font-size: 14px;\">rubber baseball<\/b><span style=\"font-size: 14px;\">, and a <\/span><b style=\"font-size: 14px;\">bowling ball<\/b><span style=\"font-size: 14px;\">. Now, which of these do you think will float in water?<\/span> <span style=\"font-size: 14px;\">Make your prediction in your head. Thinking time starts&#8230; NOW!<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-50087\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-19-4.37.31.jpg\" alt=\"\" width=\"432\" height=\"301\" \/><\/p>\n<p>The answer is&#8230; the result of our actual experiment is in this video:<\/p>\n<p><iframe loading=\"lazy\" title=\"\u30dc\u30a6\u30ea\u30f3\u30b0\u306e\u7403\u306f\u6c88\u3080\uff1f\u6d6e\u304f\uff1f\u3042\u306a\u305f\u306e\u5e38\u8b58\u3092\u8986\u3059\uff01\u6d6e\u6c88\u3067\u5b66\u3076\u300c\u6d6e\u529b\u306e\u79d1\u5b66\u300d\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/hBVo1ABvoHc?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><span style=\"font-size: 14px;\">The balls that actually floated were, surprisingly, the <\/span><b style=\"font-size: 14px;\">rubber baseball<\/b><span style=\"font-size: 14px;\"> and the <\/span><b style=\"font-size: 14px;\">bowling ball<\/b><span style=\"font-size: 14px;\">! Did you get your prediction right?<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-50088\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/07\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-19-4.52.01.jpg\" alt=\"\" width=\"597\" height=\"336\" \/><\/p>\n<p>I can already hear the gasps: &#8220;Wait, a bowling ball?! How can something that heavy float!?&#8221; That phenomenon\u2014floating despite being heavy\u2014is exactly what makes this experiment so fascinating. This counter-intuitive result teaches us that the relationship between &#8220;weight&#8221; and &#8220;floating\/sinking&#8221; is actually much more profound than we might initially think.<\/p>\n<p>\u203b P.S. I learned about this experiment from Professor O. I was amazed that they went to the trouble of acquiring a bowling ball just to try it out!<\/p>\n<h3>It&#8217;s Not Just About Weight! The Secret of Buoyancy<\/h3>\n<p>The bowling ball is the key ingredient here. Bowling balls use the unit of &#8220;pounds&#8221; for weight, and in fact, some pounds of balls will float, and some won&#8217;t. Even for bowling balls of the same size, if the weight and the volume relative to that weight differ, the buoyancy is affected.<\/p>\n<p>While bowling balls look almost identical in size, their weight (in pounds) varies significantly, right? This is because the weight is adjusted by changing the density of the materials inside the core of the ball.<\/p>\n<p>Bowling balls are standardized to a diameter of approximately 21.8 cm (a circumference of about 68.6 cm). Because of this, the &#8220;volume&#8221; of the ball is nearly constant regardless of its weight in pounds. The table below compares the mass and the calculated density for common weights of bowling balls.<\/p>\n<p><b>Bowling Ball Comparison Table: Pounds, Mass, Volume, and Density<\/b><\/p>\n<div class=\"horizontal-scroll-wrapper\">\n<div class=\"table-block-component\">\n<div class=\"table-block has-export-button\">\n<div><\/div>\n<div class=\"table-content not-end-of-paragraph\">\n<table>\n<thead>\n<tr>\n<td>Pounds<\/td>\n<td>Mass (kg)<\/td>\n<td>Volume (cm\u00b3)<\/td>\n<td>Density (g\/cm\u00b3)<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>6<\/td>\n<td>approx. 2.72<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 0.50<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>approx. 3.63<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 0.67<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>approx. 4.54<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 0.84<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>approx. 5.44<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 1.00<\/td>\n<\/tr>\n<tr>\n<td>14<\/td>\n<td>approx. 6.35<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 1.17<\/td>\n<\/tr>\n<tr>\n<td>15<\/td>\n<td>approx. 6.80<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 1.25<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>approx. 7.26<\/td>\n<td>approx. 5425<\/td>\n<td>approx. 1.34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div><\/div>\n<div class=\"table-content not-end-of-paragraph\"><span style=\"font-size: 14px;\">The key to understanding this phenomenon is nothing other than Density <\/span><b style=\"font-size: 14px;\">and<\/b><span style=\"font-size: 14px;\"> Buoyancy. Whether an object floats or sinks is determined not just by its weight, but by its density. Density is defined as mass (weight) per unit of volume. In simpler terms, it measures how &#8216;packed&#8217; or &#8216;hollow&#8217; something is. If an object&#8217;s density is less than water&#8217;s, it floats; if its density is greater, it sinks.<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>The point is that while a bowling ball looks heavy, some of them have internal cores with intentional voids or specially formulated materials, making their density surprisingly lower than water. In contrast, golf balls and lacrosse balls are small but packed solid, giving them a greater density than water, which is why they sink.<\/p>\n<p>That\u2019s the beauty of science: simply scaling up an experiment with everyday objects can lead to incredibly interesting and thought-provoking scientific discoveries. I encourage all of you to try the &#8220;Will it float or sink?&#8221; test with objects you find around you. New discoveries are surely waiting!<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"P70BP65JYm\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=22624\">\u6d6e\u529b\u3068\u5bc6\u5ea6\u306e\u79d1\u5b66\uff1a\u540d\u63a2\u5075\u30b3\u30ca\u30f3\u3068\u6c88\u3093\u3060\u30c8\u30de\u30c8\u304c\u6d6e\u304f\u7406\u7531<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;\u6d6e\u529b\u3068\u5bc6\u5ea6\u306e\u79d1\u5b66\uff1a\u540d\u63a2\u5075\u30b3\u30ca\u30f3\u3068\u6c88\u3093\u3060\u30c8\u30de\u30c8\u304c\u6d6e\u304f\u7406\u7531&#8221; &#8212; \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=22624&#038;embed=true#?secret=7rHkveqh91#?secret=P70BP65JYm\" data-secret=\"P70BP65JYm\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"svLGCIceh3\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=47589\">\u3010\u79d1\u5b66\u76e3\u4fee\u3011\u7518\u3044\u30c8\u30de\u30c8\u306f\u6c88\u3080\uff01\uff1f\u4ed8\u7b8b\u306f\u6fe1\u3089\u3059\u3068\u5f37\u304f\u306a\u308b\uff01\uff1f\u65e5\u5e38\u3067\u4f7f\u3048\u308b\u79d1\u5b66\u306e\u88cf\u30ef\u30b6\uff12\u9078\u300c\u30c1\u30e3\u30f3\u30cf\u30a6\u30b9\u300d\uff09<\/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\u79d1\u5b66\u76e3\u4fee\u3011\u7518\u3044\u30c8\u30de\u30c8\u306f\u6c88\u3080\uff01\uff1f\u4ed8\u7b8b\u306f\u6fe1\u3089\u3059\u3068\u5f37\u304f\u306a\u308b\uff01\uff1f\u65e5\u5e38\u3067\u4f7f\u3048\u308b\u79d1\u5b66\u306e\u88cf\u30ef\u30b6\uff12\u9078\u300c\u30c1\u30e3\u30f3\u30cf\u30a6\u30b9\u300d\uff09&#8221; &#8212; \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=47589&#038;embed=true#?secret=Ga8l0RK2rl#?secret=svLGCIceh3\" data-secret=\"svLGCIceh3\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h3>Contact and Request Information<\/h3>\n<p>Bringing the wonders and fun of science closer to you! We&#8217;ve compiled easy-to-understand guides on fun science experiments you can do at home and tips on how to perform them. Feel free to search around! \u30fbAbout the Operator, Ken Kuwako: <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">Click Here<\/a> \u30fbFor Various Requests (Writing, Lectures, Science Workshops, TV Supervision, Appearances, etc.): <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">Click Here<\/a> <span class=\"s2\">\u30fbArticle updates are posted on<\/span><span class=\"s2\"><a href=\"https:\/\/x.com\/kuwako\">X<\/a><\/span><span class=\"s2\"><a href=\"https:\/\/x.com\/kuwako\">!<\/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>Experimental videos are available on the <a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Topics 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 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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. The Great Ball Float-or-Sink Challenge! F [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":50093,"comment_status":"closed","ping_status":"open","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-55072","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\/2025\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-07-19-4.51.21.jpg","jetpack-related-posts":[{"id":53204,"url":"https:\/\/phys-edu.net\/wp\/?p=53204&lang=en","url_meta":{"origin":55072,"position":0},"title":"NASA Proves It! A Feather and a Steel Ball Fall Together \u2014 Why Do They Hit the Ground at the Same Time? 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