Suspension Bridge Science Projects
Bridges have long been a part of human civilization. The prototypes to the bridges of today were made out of natural materials, like vine, allowing people, even to this day in rural India, to cross large chasms, according to the website How Products Are Made. Some of the first modern suspension bridges, which use trusses and a rigid deck platform, were built in the early 19th century in the U.S. Today, the longest suspension bridge is in Japan. The principles of suspension bridges can be observed in a few simple, grade-school science projects.
Other People Are Reading
-
Beam Bridge vs Suspension Bridge
-
The comparable strength of two main bridge designs, the suspension and beam bridge, can be tested through rough, miniature models. Using masking tape, dental floss, scissors, paper clips, metal washers and metric rulers, both bridge types can be constructed. Once constructed, the tension, compression and load-bearing capacity for each model can be tested by tying paper cups filled with water to each of the bridges. Students can learn which model of bridge can carry wore weight, and which model is preferable for longer chasms. If done properly, students will learn that suspension bridges have greater load-carrying capacity over longer distances. Part of a lesson plan for the project should include information regarding the vulnerability of suspension bridges to wind and natural forces. An addition to the project could include blowing a fan on each of the bridge types to show the weakness in suspension bridges.
Arch Strength
-
Arches are the key to suspension bridges, allowing the road to be suspended from cables and thus maximizing its load-carrying potential. To get a better idea of the strength of the arch-shape, all you need are four eggs shells, cellophane tape and telephone books. First, cut the eggs in half, horizontally, and then wind cellophane tape on the outside of the half-shell. Lay the four shells, which will be dome-shaped, on a flat surface, making sure the cut side faces down. Place the shells into an evenly spaced rectangle and place as many phone books on top as you can.
-
Replica Suspension Bridge
-
Using wax paper, hot glue, wood glue, toothpicks, and twine, a student can construct a replica suspension bridge, according to Scholastic.com. With a protractor, the student can get the precise angles necessary to maximize the bridge's weight-bearing capacity. The project is an excellent introduction into engineering and architecture, and will require days of research.
File Card Arch
-
A simple science project using a file card, books and pennies can demonstrate the basic principle of the arch shape, and a central aspect of suspension bridges. First, cut slots at the long ends of the cards, turning the ends into flaps that can be tucked into book covers. Once tucked into the books, push the books close together to create an arch. See how many pennies the card will hold when flat, and how many it will hold when arched.
-
References
- Photo Credit Jupiterimages/Photos.com/Getty Images
