Video and lesson investigations on the topic of bridges. Key concepts include:
- There is a limit to the load that a bridge can support.
- Designs that use triangular shapes and arches can make strong bridges.
- Real bridges cannot be tested to destruction.
- Making a testing model bridges for strength of design and materials is useful. Structural design and material strength have to be combined to make an efficient bridge.
- Where the bridge is, and its intended use, affect the design.
- A bridge designer must consider where the bridge is to be located and its intended use.
- Construction costs can be an important factor.
- In addition to load bearing, bridges have to be strong enough to withstand other forces.
- They must be safe in storms and not be adversely affected by rain, snow, ice and intense heat.