Add two more 30cm-long characters. Then it's 60cm. A person weighing 50 kilograms carries 100 kilograms on his back. Then I'll weigh 150kg. It adds 100km speed to my car running at 100 km/h. Then it'll be 200 kilometers. And you'll be fined for speeding. For us, this addition is as natural as pouring sauce into sweet and sour pork. For scientists in the 17th century, this was the same. Oh, I'm not saying I ate sweet and sour pork with sauce, but I'm saying that's the addition. At that time, a representative concept that describes the natural world, Length, mass, speed, temperature, etc. had only size. So because numbers alone can represent that size, we can just add it as we did earlier. But the father of modern science, Isaac Newton brings a strange concept. It's force. Even then, it wasn't without the concept of force. What do you think force is? What comes to mind when you think of strength? "Wow, you're strong.' What do you mean? So
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