These parts can only be in tension (think about what happens if you try to "push" a rope), but they can still be useful. Sometimes towers include ropes, cables, or chains as part of the design.Beams can be in either tension or compression, depending on how a tower is designed. An object that is being "squished" is in compression and an object that is being pulled on is in tension.Can you identify any trusses in Figures 1 and 2? Multiple beams can be combined to make trusses. Beams are long, skinny elements used to make many structures like towers and bridges.Rather than explain each topic in detail, this Background section will give you a brief overview, and you can do more research on your own or use the links in the Bibliography. You can use this project to explore several topics in physics and engineering.
As shown in the following video, your goal is to build the tallest possible tower using only paper and tape, but the tower must also support a can of food at the top.
The 2021 Engineering Challenge is inspired by towers like those in Figures 1 and 2. Radio towers (left) and a water tower (right).
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