Bridges use special shapes and materials to stay up. Imagine a triangle made of sticks, it doesn't fall apart easily. Bridges are like big triangles, but they're much stronger because they're made of concrete or steel. The shape helps them hold weight without support from below.
Examples
- A triangle made of sticks stays strong even when you push on it.
- A bridge looks like it's floating, but it uses triangles to stay up.
- You can walk across a bridge because it pushes back as hard as you step forward.
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See also
- How Do Bridges Hold Up Heavy Traffic?
- How Do Bridges Stay Up Without Being Tied Together?
- How Do Bridges Stay Strong Over Time?
- What Causes the Earth to Spin?
- What Causes the ‘Breeze’ Inside a Moving Train?
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