{"id":53128,"date":"2025-09-25T04:46:11","date_gmt":"2025-09-24T19:46:11","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=53128"},"modified":"2025-09-25T04:46:11","modified_gmt":"2025-09-24T19:46:11","slug":"is-your-intuition-wrong-a-deep-dive-into-newtons-third-law-with-mind-twisting-examples","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=53128&lang=en","title":{"rendered":"Is Your Intuition Wrong? A Deep Dive into Newton\u2019s Third Law (with Mind-Twisting Examples!)"},"content":{"rendered":"

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I’m Ken Kuwako, a science trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

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The Law of Action and Reaction: A Sumo Showdown Between an Elephant and a Gorilla!<\/h2>\n

Today, I want to pose a little “force” quiz. Imagine this: a massive elephant and a powerful gorilla face off in a sumo match. They collide with a “THUD!”, and the elephant pushes the gorilla back. Picture that scene in your mind.<\/span><\/p>\n

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At this moment, which force is greater: the force the elephant exerts on the gorilla, or the force the gorilla exerts back on the elephant?<\/p>\n

“Well, obviously the elephant is stronger, so the force it pushes with must be bigger, right?”<\/p>\n

That’s the intuitive answer for many people, but wait! There’s a fascinating pitfall of physics hiding here that we often miss in our daily lives and that many people confuse. And that’s the topic for today: the Law of Action and Reaction.<\/p>\n

What is the “Law of Action and Reaction”?<\/h3>\n

The surprising conclusion is that the force the elephant exerts on the gorilla and the force the gorilla exerts back on the elephant are always the exact same size!<\/span><\/p>\n

Surprised? This is what’s known as Newton’s Third Law, or the Law of Action and Reaction.<\/span><\/p>\n

The law is defined as follows:<\/p>\n

“For every action, there is an equal and opposite reaction. When object A exerts a force on object B, object B exerts a force on object A that is equal in magnitude and opposite in direction.”<\/p>\n

Simply put, if you push something, it pushes back. If you pull something, it pulls back. When you push on a wall, the wall pushes back on you. And when the Earth’s gravity pulls on you, you’re pulling on the Earth with the exact same force (though with its immense mass, the Earth doesn’t budge!).<\/p>\n

Let’s go back to our sumo match. The elephant applies a force as an “action” on the gorilla, and the gorilla applies an “equal and opposite reaction” force on the elephant.<\/p>\n

So then why does the elephant move forward and the gorilla get pushed back?<\/h3>\n

“But wait, if the forces are equal, shouldn’t they both just stay still? The elephant actually moves forward and the gorilla gets pushed back, right?”<\/p>\n

That’s an excellent question! This is where many people get confused, mixing up the Law of Action and Reaction with the equilibrium of forces.<\/p>\n