Objective
The objective of this lesson is to demonstrate their knowledge of bridges by
designing and constructing either an arched or trussed bridge.
Lab Activity
In this lesson students will design their bridge on paper and then select the materials
needed to build their bridge. They can choose from the following materials when constructing their bridge: concrete (they will create the mixture), wood, or metal. Glue can be used to represent a weld and pins or small nails may be used for joints to represent bolts or rivets.
Post Lab Activity
Each group of students will be expected to present their bridge to the class and discuss the following topics:
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• Why they choose that specific bridge type
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• How did they decide what material to use when constructing their bridge
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• How their bridge sustains loads
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• How the bridge remains in equilibrium
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• What members are in tension, compression, or both
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• How did their method of constructing a bridge compare with the process an engineer follows
In conclusion of this unit, you may want to summarize as a class. You can form five groups of students to discuss the three types of bridges and their characteristics, the science involved in selecting materials, and finally the economics involved in the construction of a new bridge. You may also want to take the students on a field trip to view different types of bridges New York City and Connecticut. While on the tour, you may have students report on each bridge visited.
(figures available in print form)
