How do bridges hold up the weight of so many cars?
Bridge's Lazy Genius
How do bridges hold up the weight of so many cars?
A bridge looks almost lazy, doesn't it? Just lying there, stretched across a river while trucks and buses thunder over it like it's nothing. But that "nothing" is a quiet kind of genius. A bridge is a machine with no moving parts, built to do one stubborn job: catch a load and pass it along to the ground. Let's see how it pulls off the trick.
Here's the first secret: when a car parks on a bridge, the car doesn't really "sit" there. Its weight has to go somewhere. Think of a heavy backpack on your shoulders — you don't hold the strap with your fingers, you let the weight slide down through your spine and into your legs and into the floor. A bridge does the same. Every pound of car gets handed downward, step by step, until the Earth takes it.
