A beam bridge is the simplest type of bridge, and is typically supported by a raised part on either end. Your construction is limited by the amount of funds you have, so build your bridge wisely Features: Fun theme suitable for everyone Grid system enabled for. In this activity, you build and test two types of bridges: a simple suspension bridge and a beam bridge. The concept of structural strength, and the notion of strong and stable structures. The dramatic collapse of the Tacoma Narrows Bridge (in Washington in 1940) is an infamous example of this. Players can build and test their own pasta bridge in Bridge Works. However, since suspension bridges are relatively flexible structures, stress forces introduced by high winds can be a serious problem. The cables are thus under tension while the bridge towers are under compression.įor long spans, the suspension bridge is usually the most economical choice because the amount of material required per unit length is less than for other bridge types. These cables stretch between the bridge's towers and are securely anchored at each end. In a suspension bridge, the bridge deck (the part of the bridge that supports the load, such as cars and their passengers) hangs from, or is suspended by, massive cables. When the suspension bridge eventually failed, the bridge deck straw likely similarly bent into a V-shape, but because it was attached by the thread, the straw could not fall and instead the cup may have slipped off of the straw. As coins were added to the suspension bridge, the cable (i.e., thread) was under tension and reinforced the bridge deck straw, pulling it upwards (while compressing the towers) and allowing the bridge to hold more coins. When the beam bridge failed, this was likely because the bridge deck straw bent downward as more coins were added until it bent so much that it slipped down between the two towers. In this activity you should have seen that the suspension bridge was able to hold more coins than the beam bridge by around 150%, such as about 310 pennies (or 140 quarters) compared to about 200 pennies (or 90 quarters).
Why do you think you got the results that you did?ĭid the suspension bridge hold a greater number of coins compared to the beam bridge?
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