{"id":62063,"date":"2026-04-02T04:28:41","date_gmt":"2026-04-01T19:28:41","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=62063"},"modified":"2026-04-02T04:28:41","modified_gmt":"2026-04-01T19:28:41","slug":"shadows-reveal-physics-secrets-the-surprising-link-between-uniform-circular-motion-and-simple-harmonic-motion","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=62063&lang=en","title":{"rendered":"Shadows Reveal Physics Secrets! The Surprising Link Between Uniform Circular Motion and Simple Harmonic Motion"},"content":{"rendered":"

I’m Ken Kuwako, your Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

Have you ever been mesmerized by shadows dancing on a wall, moving with a rhythm that makes them seem almost alive? In the world of physics, shadows are far more than just dark shapes\u2014they are powerful tools that reveal hidden truths. Today, we\u2019re going to use the power of shadows to uncover the surprising connection between two seemingly different motions: spinning and swinging.<\/p>\n

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The Mysterious Shadow Connecting Circles and Oscillations<\/h3>\n

In high school physics, many students hit a metaphorical wall when they encounter “Simple Harmonic Motion” (SHM). This is that distinct, rhythmic bouncing of a weight hanging from a spring.<\/p>\n

Actually, this complex-looking motion becomes crystal clear when you view it as a side-on version of “Uniform Circular Motion.” Physics uses a symbol called “\u03c9” (angular velocity) to describe the speed of rotation, but trying to visualize how that links to a bouncing spring in your head can be a real headache.<\/p>\n

Inspired by the clever “Shadow Pitagora” segments from the popular Japanese show Pitagoraswitch, I set up an experiment: project a light onto a spinning ball and observe its shadow. Take a look at this video first, and watch for the incredible synchronicity created by the shadows.<\/p>\n