🚀 Force & Motion
🍎

Why Does an Apple Fall Down, Not Up?

The ground beneath your feet is pulling the apple, the Moon, and you.
🔬 Gravity · Universal Gravitation 📖 重
💡 TL;DR

Why Does an Apple Fall Down, Not Up? — To fall is not weakness but connection. As the apple seeks the ground and the Moon never leaves the Earth, it is this pull that keeps us from scattering apart. Weight is not a burden — it is the world's hand, holding you close.

1Wonder

Drop an apple and it always falls down — never sideways, never up, always toward the ground. It feels so obvious that almost no one asked: why exactly does the apple fall down? Who, or what, is pulling it?

2🔭 The Inquiry

For a long time people simply believed that "heavy things naturally seek to go down." A stone wanted to return to its home, the earth; flame wanted to rise to the sky. But that was not an answer to "why" — it was just another way of saying "that's how it is." No one could explain what actually did the pulling.

3💡 The Turning Point

One thinker realized that an apple falling and the Moon orbiting the Earth are the same event. The very force that drops the apple reaches all the way to the Moon and holds it in its path. Every object pulls on every other — stronger when heavier, weaker when farther. The ground pulls the apple, and the apple, ever so faintly, pulls the ground too. The Earth is just so overwhelmingly heavy that only the apple seems to move.

4🌍 In the World
  • Satellites and space stations: they orbit by perpetually "falling" around the Earth
  • Rocket launches: a craft must reach a speed great enough to overcome gravity
  • Tides: the Moon's pull on the oceans raises and lowers the sea
Essence in One Hanja
重 (jung) — heavy, weight, important

重 (jung) comes from the image of a person bearing a heavy load on the back. Weight (重) is precisely the strength of the Earth's pull. Just as 重 grew to mean both "heavy" and "important" in the East, in physics the force of attraction is the most important thread binding the world into one.

Meet this hanja in Cheonjamun →
5✨ What Nature Teaches

To fall is not weakness but connection. As the apple seeks the ground and the Moon never leaves the Earth, it is this pull that keeps us from scattering apart. Weight is not a burden — it is the world's hand, holding you close.