How Do Bridges Stay Up?

💡 Simple Explanation

Bridges are like really strong arms holding hands across a gap! Engineers figure out how heavy cars and trucks can be, then build something even stronger. Some bridges use triangles - triangles are super strong shapes that don't squish or wiggle. Other bridges hang from giant cables like a swing hangs from chains. Some use arches that push weight out to the sides instead of straight down. Engineers test everything with math before building!