| A | B |
|---|
| What did early civilzations use for bridges | stone, fallen trees, vines |
| This was an advantage of the covered bridge | The roof protected the wooden floor from rotting |
| This was a disadvantage of the covered bridge | They weren't protected against fire |
| What is the most common material used in building bridges today | Reinforced Concrete |
| What was the problem with Iron | Iron Cracked |
| What was the 1st steel bridge in the world | Eves Bridge |
| What caused the Tacoma Narrows Bridge to collapse | Solid Plates |
| When did construction on the 4-lane interstate highway begin | In the 1950's |
| Tensile Force | The force that causes a material to stretch |
| Tension Force | Stretching Force |
| Compression or Compressive Force | A force that causes material to become compact and pressed together |
| Shear Force | A force that tends to cause a material to tear or be cut apart |
| Torsion Force | Twisting Force |
