Science Fair topics that involves structures and engineer work.?

Answer 1

Build a truss bridge. Do some research about the mechanics of trusses and build a bridge. At the fair, show how the bridge deflects under a load.

A simpler exhibit would be to show why and how different shapes and orientations of a beam yield different results. Take a yard stick and lay it across two tables. It will bend easily with a load placed in the middle. However, if you turn it 90 degrees (you have to support the ends) and put the same load in the middle it will hardly bend at all. Why is this? This simple experiment is the basis for beam theory.

Answer 2

Try bridge building. You can demonstrate how different structures hold up under pressure. Bridge cables are an amazing feature they are made up of strands of steel about a 1/4 in. in diameter and then are twined into large cables and then twined into larger cables. Bridges use these cables everywhere to allow for sway in the wind, they use them under the road to hold the sections of concrete frame together and they stretch over many hundreds of feet as tightly as possible. Then they are used up above on many highlevel bridges to support the weight of the road as well. That is just one tidbit, but you can explain the many shapes and forms of bridges as well, and easily make mock-ups.