Name _________________________________________ Date _____________
All of the bridges in Part 1 are built with yellow rods for spans and red rods for supports, like the one shown here. This is a 2-span bridge like the one you just built. Note that the yellow rods are 5 cm long.
Now, build a 3-span bridge.
How many yellow rods did you use? _______
How long is your bridge? _______
How many red rods did you use? _______
How many rods did you use altogether? _______
Try to answer these questions without building a 5-span bridge. If you want, build a 5-span bridge to check your answers.
How many yellow rods would you need for a 5-span bridge? _______
How long would your bridge be? _______
How many red rods would you need? _______
How many rods would you need altogether? _______