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Tension

Force

Compression

Pressure

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Add your own and check out what your friends are thinking....

BEAM bridge: all you need is a rigid horizontal structure (a beam) and two supports, one at each end, to rest it on.  (2) consists of a horizontal beam supported at each end by piers.

Cantilever Bridge:

(1) A simple cantilever span is formed by two cantilever arms extending from opposite sides of an obstacle to be crossed, meeting at the center.

(2) A structure at least one portion of which acts as an anchorage for sustaining another portion which extends beyond the supporting pier.

TRUSS bridge:  a bridge that consists of an assembly of triangles.

ARCH bridge: a bridge with abutments at each end shaped as a curved arch. (abutement: something against which another thing rests its weight or pushes with force; (2) The part of a structure that bears the weight or pressure of an arch.  (3) a structure that supports the end of a bridge.)

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SciShow Kids 3 minute video

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What Makes Bridges So Strong? | Engineering for Kids | STEAM | SciShow Kids

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Craggy Rock Needs Help!  Check out if you can help this town plan to build different bridges for different parts of town!  

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Craggy Rock Needs Help!  Check out if you can help this town plan to build different bridges for different parts of town!  

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PBS.org Bridge Challenge

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PBS.org Forces Lab - try it out!

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There is also a text version of this lab. These Labs require the most recent version of the Flash plug-in. You can download Flash from the Macromedia web site for free. If you are having trouble with Flash, please take a look at our Help page.

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PBS.org site to help plan your bridge

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There are more than half a million bridges in the United States, and you rely on them every day to cross obstacles like streams, valleys, and railroad tracks. But do you know how they work? Or why some bridges are curved while others are straight? Engineers must consider many things -- like the dist…

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Check out PBS.org sites: to get you started:

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Check out PBS.org sites: to get you started:

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Bridges

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Bridge Basics
Get the spin on spans.

The Bridge Challenge
The city of Craggy Rock needs your help to build four new bridges.

Wonders of the World Databank
How long can a bridge be? Why would a bridge make someone seasick? Find out when you check out these bridges:

Akashi Kaikyo Bridge
Brooklyn Bridge
Charles River Bridge
Chesapeake Bay Bridge-Tunnel
Firth of Forth Bridge
Garabit Viaduct
George P. Coleman Bridge
Golden Gate Bridge
Iron Bridge
New River Gorge Bridge
Sunshine Skyway Bridge
Tacoma Narrows Bridge
Tower Bridge

Forces Lab
Check out how forces affect structures like bridges.

Who Builds Big?
Meet Miguel Rosales, an architect who designs beautiful bridges, and David Nyarko, an engineer who makes bridges move!

Bridge Webography
Check out these links to a bevy of bridge resources on the Web.

BUILDING BIG: Bridges
Learn more about the PBS broadcast program.

Buy the DVD

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Bridge Basics Get the spin on spans. The Bridge Challenge The city of Craggy Rock needs your help to build four new bridges. Wonders of the World Databank How long can a bridge be? Why would a bridge make someone seasick?