How Do Bridges Stay Up Without Being Tied Together?

Bridges don’t need to be tied together because they use shapes that help them stay strong. Like when you push your hands together, they support each other. Bridges work the same way, triangles and arches keep everything in place without any strings or glue.

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Examples

A triangle made with sticks can hold up a book, just like parts of a bridge.
When you fold a paper into an arch, it holds more weight than when it's flat.
A rope tied between two trees can support your weight even without being glued.

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Categories: Science · Engineering,Physics,Structures