{"id":65658,"date":"2026-07-23T04:44:10","date_gmt":"2026-07-22T19:44:10","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=65658"},"modified":"2026-07-23T04:44:10","modified_gmt":"2026-07-22T19:44:10","slug":"energy-isnt-a-thing-unlocking-the-true-nature-of-kinetic-and-potential-energy-through-work","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=65658&lang=en","title":{"rendered":"Energy Isn&#8217;t a &#8220;Thing&#8221;! Unlocking the True Nature of Kinetic and Potential Energy Through Work"},"content":{"rendered":"<p style=\"text-align: center;\"><strong style=\"color: #339966;\">I&#8217;m Ken Kuwako, the Science Trainer. Every day is an experiment.<\/strong><\/p>\n<p>This article is based on the book &#8220;High School Physics Refresher for Adults.&#8221;<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"mS7gkaaiM9\"><p><a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u3010\u7279\u8a2d\u30da\u30fc\u30b8\u3011<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201c\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u3010\u7279\u8a2d\u30da\u30fc\u30b8\u3011\u201d \u2014 \u79d1\u5b66\u306e\u30cd\u30bf\u5e33\" src=\"https:\/\/phys-edu.net\/wp\/?p=1827&amp;embed=true#?secret=ZDBiIzIGbp#?secret=mS7gkaaiM9\" data-secret=\"mS7gkaaiM9\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>&#8220;I&#8217;m out of energy&#8230; I can&#8217;t move another step!&#8221;<\/p>\n<p>Chances are you&#8217;ve said something like that yourself. We hear the word &#8220;energy&#8221; all the time in everyday life. But if a child suddenly asks, &#8220;So&#8230; what exactly is energy?&#8221; how would you answer?<\/p>\n<p>Surprisingly, that&#8217;s a question even many adults struggle to explain accurately.<\/p>\n<p>Energy isn&#8217;t a physical object. In physics, it means the ability to do work.<\/p>\n<p>You might immediately wonder, &#8220;What kind of work?&#8221; or &#8220;What do you mean by ability?&#8221;<\/p>\n<p>The word &#8220;work&#8221; in physics has a very different meaning from the work we do at our jobs. To understand it, let&#8217;s first look at the two most fundamental equations for energy.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-65626 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/A0A56939-A74F-44E6-B3D8-A83EF3550606.png\" alt=\"\" width=\"422\" height=\"281\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/A0A56939-A74F-44E6-B3D8-A83EF3550606.png 1536w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/A0A56939-A74F-44E6-B3D8-A83EF3550606-300x200.png 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/A0A56939-A74F-44E6-B3D8-A83EF3550606-1024x683.png 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/A0A56939-A74F-44E6-B3D8-A83EF3550606-768x512.png 768w\" sizes=\"auto, (max-width: 422px) 100vw, 422px\" \/><\/p>\n<p style=\"text-align: center;\">E = 1\/2mv\u00b2<br \/>\nKinetic Energy = 1\/2 \u00d7 Mass \u00d7 Velocity\u00b2<\/p>\n<p style=\"text-align: center;\">E = mgh<br \/>\nPotential Energy = Mass \u00d7 Gravitational Acceleration \u00d7 Height<\/p>\n<p>The key variable in kinetic energy is v (velocity). The key variable in potential energy is h (height).<\/p>\n<p>In other words, speed and height are the two big clues to understanding energy.<\/p>\n<h3>What Does &#8220;Work&#8221; Mean in Physics?<\/h3>\n<p>Now let&#8217;s take a closer look at what physicists mean by &#8220;work.&#8221;<\/p>\n<p>In physics, work is defined as:<\/p>\n<p><b>Force applied to an object \u00d7 the distance it moves.<\/b><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-65633\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.52.32.jpeg\" alt=\"\" width=\"534\" height=\"308\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.52.32.jpeg 1106w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.52.32-300x173.jpeg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.52.32-1024x591.jpeg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.52.32-768x443.jpeg 768w\" sizes=\"auto, (max-width: 534px) 100vw, 534px\" \/><\/p>\n<p style=\"text-align: center;\">W = Fx<br \/>\nWork = Force \u00d7 Distance<\/p>\n<p>No matter how hard you push, if the object doesn&#8217;t move, the work done is 0 joules.<\/p>\n<p>That&#8217;s why pushing against a wall with all your strength doesn&#8217;t count as &#8220;doing work&#8221; in physics\u2014as strange as that may sound!<\/p>\n<p>The SI unit of work is technically the newton-meter (N\u00b7m), but since it appears so often, physicists simply call it the joule (J).<\/p>\n<p>To get an intuitive feel for it, imagine lifting a one-liter milk carton (which weighs about 10 N) from the floor up to about waist height\u2014roughly one meter. That requires about 10 J of work.<\/p>\n<p>Incidentally, the joule is named after the 19th-century British scientist James Prescott Joule. Although he worked in his family&#8217;s brewery, he devoted countless hours to scientific experiments. Through careful measurements, he showed that mechanical work\u2014such as stirring water\u2014and heat are actually interchangeable forms of the same thing: energy.<\/p>\n<p>At the time, heat and motion were believed to be completely unrelated, so Joule&#8217;s discovery dramatically changed the way scientists understood the physical world.<\/p>\n<p>Earlier, we defined energy as the ability to do work.<\/p>\n<p>Another way to think about it is this:<\/p>\n<p><b>Energy is the potential to apply a force and make something move.<\/b><\/p>\n<p>For example, a ball resting on the ground has essentially no energy available for doing work. It has no opportunity to move another object.<\/p>\n<p>But once the ball starts rolling, everything changes.<\/p>\n<p>Why?<\/p>\n<p>Because a moving ball can collide with something else, exert a force, and make that object move. In other words, it now has the potential to do work.<\/p>\n<p>Likewise, if you lift the ball into the air, it also gains energy.<\/p>\n<p>If you let go, gravity pulls it downward, allowing it to strike something below\u2014perhaps driving a nail into a piece of wood. Again, it has the ability to do work.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-65627 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/Copilot_20260722_074340.png\" alt=\"\" width=\"350\" height=\"350\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/Copilot_20260722_074340.png 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/Copilot_20260722_074340-300x300.png 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/Copilot_20260722_074340-150x150.png 150w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/Copilot_20260722_074340-768x768.png 768w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><\/p>\n<p>The energy possessed by a moving object is called kinetic energy.<\/p>\n<p>The energy stored because of an object&#8217;s height is called gravitational potential energy.<\/p>\n<h3>Deriving the Formula for Kinetic Energy<\/h3>\n<p>Now let&#8217;s see where the kinetic energy equation comes from.<\/p>\n<p>Suppose a constant force F [N] acts on an object that starts from rest, pushing it through a distance x [m]. The work done is therefore Fx.<\/p>\n<p style=\"text-align: center;\">v\u00b2-v\u2080\u00b2 = 2ax<\/p>\n<p>Using Newton&#8217;s Second Law (ma = F), we substitute a = F\/m into the equation above and solve for the work:<\/p>\n<p style=\"text-align: center;\">1\/2mv\u00b2 &#8211; 1\/2mv\u2080\u00b2 = Fx<\/p>\n<p>The right side represents the work done.<\/p>\n<p>Notice the term 1\/2mv\u00b2 on the left. This is exactly the quantity produced when work is done on an object.<\/p>\n<p>That quantity is kinetic energy.<\/p>\n<p>Since velocity appears in the equation, it clearly represents energy associated with motion.<\/p>\n<p>You can also read the equation in reverse:<\/p>\n<p>&#8220;If an object has kinetic energy of 1\/2mv\u00b2, then it is capable of doing Fx amount of work.&#8221;<\/p>\n<p>Let&#8217;s calculate a real-world example.<\/p>\n<p>A typical passenger car weighs about 1,000 kg.<\/p>\n<p>At 30 km\/h (about 8 m\/s), its kinetic energy is<\/p>\n<p style=\"text-align: center;\">E = 1\/2 \u00d7 1000 \u00d7 8\u00b2 = 32,000 J<\/p>\n<p>That&#8217;s enough energy to lift a one-liter milk carton about 3,200 meters into the air!<\/p>\n<p>The number is much larger than many people expect.<\/p>\n<p>One especially important point is that velocity is squared.<\/p>\n<p>Double the speed, and the kinetic energy becomes four times greater.<\/p>\n<p>That&#8217;s why a collision at 60 km\/h is dramatically more destructive than one at 30 km\/h.<\/p>\n<p>Whenever I explain this in traffic safety lessons, students suddenly become much more attentive.<\/p>\n<h3>Deriving the Formula for Potential Energy<\/h3>\n<p>Next, let&#8217;s look at potential energy.<\/p>\n<p>Imagine lifting an object to a height h [m].<\/p>\n<p>To do this, your hand must apply an upward force against gravity.<\/p>\n<p>The work your hand performs is<\/p>\n<p style=\"text-align: center;\">Fx = mg \u00d7 h<br \/>\n= mgh<\/p>\n<p>The quantity mgh is the energy stored in the object after the work has been done.<\/p>\n<p>This is called gravitational potential energy.<\/p>\n<p>Once the object is elevated, releasing it allows gravity to convert that stored energy into work.<\/p>\n<p>For example, a 1 kg milk carton sitting on a desk about 0.5 m high has approximately<\/p>\n<p>1 \u00d7 10 \u00d7 0.5 = 5 J<\/p>\n<p>of potential energy.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-65631 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.50.00.jpeg\" alt=\"\" width=\"600\" height=\"332\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.50.00.jpeg 1160w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.50.00-300x166.jpeg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.50.00-1024x567.jpeg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-22-7.50.00-768x425.jpeg 768w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>An airplane flying through the sky has both kinetic energy and potential energy at the same time.<\/p>\n<p>The sum of these two is called mechanical energy, distinguishing it from other forms such as heat or electrical energy.<\/p>\n<p>One of the most beautiful ideas in physics is that, if no outside forces like friction interfere, kinetic energy and potential energy continuously transform into each other while their total remains constant.<\/p>\n<p>This is known as the Law of Conservation of Mechanical Energy.<\/p>\n<p>That&#8217;s why a roller coaster moves slowly at the very top of a hill but races downhill at incredible speed\u2014its potential energy is being converted into kinetic energy.<\/p>\n<p>A swinging pendulum is another perfect example, constantly exchanging one form of energy for the other.<\/p>\n<h3>Power: Measuring How Fast Work Gets Done<\/h3>\n<p>Imagine two machines.<\/p>\n<p>Machine A performs 100 J of work in just 10 seconds.<\/p>\n<p>Machine B performs the same 100 J, but takes an entire hour.<\/p>\n<p>Which would you choose?<\/p>\n<p>Most people would choose Machine A.<\/p>\n<p>That&#8217;s because the amount of work alone doesn&#8217;t tell us how quickly the work is done.<\/p>\n<p>To measure that, physicists use a quantity called power.<\/p>\n<p>Its unit is the watt (W), where<\/p>\n<p>1 watt = 1 joule of work per second.<\/p>\n<p style=\"text-align: center;\">Power Formula: P = W\/t<br \/>\n(Power = Work \u00f7 Time)<\/p>\n<p>Machine A has<\/p>\n<p>100 J \u00f7 10 s = 10 W<\/p>\n<p>Machine B has<\/p>\n<p>100 J \u00f7 3600 s \u2248 0.03 W<\/p>\n<p>Clearly, Machine A gets much more done in the same amount of time.<\/p>\n<p>When you look at appliances like microwave ovens or hair dryers, you&#8217;ll often see labels such as &#8220;1200 W.&#8221;<\/p>\n<p>That&#8217;s the same unit of power.<\/p>\n<p>A higher wattage means the appliance uses more energy\u2014and gets more work done\u2014in the same amount of time.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-65632 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/985CB071-DFAD-4331-A836-F46E657FB825.png\" alt=\"\" width=\"463\" height=\"347\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/985CB071-DFAD-4331-A836-F46E657FB825.png 1448w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/985CB071-DFAD-4331-A836-F46E657FB825-300x225.png 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/985CB071-DFAD-4331-A836-F46E657FB825-1024x768.png 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/985CB071-DFAD-4331-A836-F46E657FB825-768x576.png 768w\" sizes=\"auto, (max-width: 463px) 100vw, 463px\" \/><\/p>\n<p>The watt is named after James Watt, the engineer famous for improving the steam engine.<\/p>\n<p>If James Joule helped us understand what energy is, James Watt gave us the unit for measuring how quickly energy is used.<\/p>\n<p>It&#8217;s fascinating to realize that ideas beginning with speed and height eventually explain the numbers printed on everyday household appliances.<\/p>\n<p>Perhaps after reading this, you&#8217;ll never look at those numbers in quite the same way again.<\/p>\n<h3>Contact &amp; Collaboration<\/h3>\n<p>Discover the fun and wonder of science through easy-to-follow experiments you can try at home. Feel free to explore the site for more ideas!<\/p>\n<p>\u2022 Learn more about Ken Kuwako here:<br \/>\n<a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">About the Author<\/a><\/p>\n<p>\u2022 For writing, lectures, science workshops, TV consulting, or media appearances:<br \/>\n<a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">Contact &amp; Booking<\/a><\/p>\n<p><span class=\"s2\">\u2022 Follow the latest articles 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><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Notes Channel<\/a> features fun experiment videos!<\/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\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\uff11\uff18\u65e5\uff08\u571f\uff09\u300c<a href=\"https:\/\/official.idolfes.com\/s\/tif2026\/page\/broadcast\">TIF\u3000presents\u3000ONE\u3000SONG\u3000FES. <\/a>\u300d\uff08\u30d5\u30b8\u30c6\u30ec\u30d3\uff09<\/li>\r\n \t<li>7\u670818\u65e5\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<\/a><\/li>\r\n \t<li>7\u670823\u65e5\uff08\u6728\uff09\u79d1\u5b66\u76e3\u4fee\u300019:00\u301c\u3000<a href=\"https:\/\/www.ntv.co.jp\/toppa\/\">THE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb<\/a>\uff08\u65e5\u672c\u30c6\u30ec\u30d3\uff09<\/li>\r\n \t<li>\uff17\u6708\uff13\uff10\u65e5\uff08\u6c34\uff09\u3000\u76e3\u4fee\u3057\u305f\u30c6\u30ec\u30d3\u756a\u7d44\u653e\u9001\u4e88\u5b9a<\/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, the Science Trainer. Every day is an experiment. This article is based on the book &#038;#822 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":65627,"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-65658","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\/2026\/07\/Copilot_20260722_074340.png","jetpack-related-posts":[{"id":61520,"url":"https:\/\/phys-edu.net\/wp\/?p=61520&lang=en","url_meta":{"origin":65658,"position":0},"title":"Kitchen Physics! The Spinning Secret That Reveals Raw vs. Boiled Eggs (An Energy Perspective)","author":"\u6851\u5b50 \u7814","date":"2026\u5e743\u670815\u65e5","format":false,"excerpt":"I\u2019m 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\/2019\/04\/f57dae675b5b01ab199eb1f20e627207.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/f57dae675b5b01ab199eb1f20e627207.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/f57dae675b5b01ab199eb1f20e627207.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/f57dae675b5b01ab199eb1f20e627207.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/f57dae675b5b01ab199eb1f20e627207.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":51496,"url":"https:\/\/phys-edu.net\/wp\/?p=51496&lang=en","url_meta":{"origin":65658,"position":1},"title":"Terror of a 16m Drop, Explained by Science! A Mathematical Look at Splash Mountain: Disneyland Physics","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u67084\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\/2023\/10\/d81af24e207aa30be0c19eb93966a2fe.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/10\/d81af24e207aa30be0c19eb93966a2fe.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/10\/d81af24e207aa30be0c19eb93966a2fe.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/10\/d81af24e207aa30be0c19eb93966a2fe.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":61603,"url":"https:\/\/phys-edu.net\/wp\/?p=61603&lang=en","url_meta":{"origin":65658,"position":2},"title":"Can a Shower and a Toy Water Wheel Teach Physics? A Fun Introduction to Energy with a Ping-Pong Gun","author":"\u6851\u5b50 \u7814","date":"2026\u5e743\u670818\u65e5","format":false,"excerpt":"Hi, I'm Ken Kuwako, your Science Trainer. To me, 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\/2019\/04\/3038e7e4e115dbdc39235043604e2048.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/3038e7e4e115dbdc39235043604e2048.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/3038e7e4e115dbdc39235043604e2048.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2019\/04\/3038e7e4e115dbdc39235043604e2048.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":55043,"url":"https:\/\/phys-edu.net\/wp\/?p=55043&lang=en","url_meta":{"origin":65658,"position":3},"title":"An Origami Frog as a Physics Lesson!? The Hidden Secret of Energy Conversion Behind Its \u2018Boing!\u2019","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u670827\u65e5","format":false,"excerpt":"Ken Kuwako, Science Trainer. Every Day is an Exper\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\/10\/%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%88-2025-10-27-6.06.39-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-27-6.06.39-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-27-6.06.39-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/10\/%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%88-2025-10-27-6.06.39-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":60318,"url":"https:\/\/phys-edu.net\/wp\/?p=60318&lang=en","url_meta":{"origin":65658,"position":4},"title":"Learn How Engines Work with a Shocking \u201cPop!\u201d \u2014 The Secret of Alcohol Explosion Experiments (First Law of Thermodynamics)","author":"\u6851\u5b50 \u7814","date":"2026\u5e742\u67089\u65e5","format":false,"excerpt":"I am Ken Kuwako, your Science Trainer. 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