Without Friction We Could Not Take a Single Step
Without Friction We Could Not Take a Single Step — Thinking of friction, I recall the resistances of life. We resented the frictions we met — the person who blocked us, the circumstance that slowed us, the years that wore us down. Yet the fact that without friction we cannot take a single step quiets me. Wherever we built something, wherever we found our footing, there was resistance. On a road that is only smooth, no one moves forward. What held me back and what held me up may have been two faces of one same force.
Friction was always the nuisance — it wears out machines, weighs down loads, and throws us down on ice. So all our lives we schemed about how to reduce it. But if friction vanished completely, would we truly be free? Anyone who has stood on ice unable to take a single step already knows the answer.
For ages friction was no subject of study, only an inconvenience. Cart drivers greased their wheels and smiths ground their iron, but none asked why things stop. The first to look it in the eye was Leonardo da Vinci in the fifteenth century, dragging weighted blocks and recording the force in his notebooks: double the weight, double the friction. But his notebooks lay buried for centuries, until the French engineer Coulomb rediscovered the same law in the eighteenth century and gave it to the world.
The core insight is simple yet deep: friction is the force by which two touching surfaces grip each other. Even a surface that looks smooth is, in the small, rugged — and the ruggedness interlocks. From this comes a startling truth: walking itself is friction's doing. When your foot pushes the ground backward, friction pushes you forward in return. Without it the foot spins in place and we merely slide where we stand. The car's tire, the cup in your hand, the knotted rope — all are held by friction. What we took for an enemy was in fact the ground beneath our feet.
- Spreading sand or salt on winter ice restores friction to keep us from falling — the very opposite of a lifetime spent trying to remove it.
- Brakes stop a car by friction: disc and pad rub together, turning motion into heat to make the stop. We run by friction, and stop by friction too.
- Screws, knots, the ridges of a fingerprint — every act of gripping and holding is friction's help. An elder's hand drops a slick cup because the friction at the fingertips has thinned.
步, 한 걸음을 뗄 수 있는 것 자체가 땅과 발 사이 마찰이 우리를 앞으로 밀어준 결과다.
Meet this hanja in Cheonjamun →Thinking of friction, I recall the resistances of life. We resented the frictions we met — the person who blocked us, the circumstance that slowed us, the years that wore us down. Yet the fact that without friction we cannot take a single step quiets me. Wherever we built something, wherever we found our footing, there was resistance. On a road that is only smooth, no one moves forward. What held me back and what held me up may have been two faces of one same force.
