Engineering the City: How Infrastructure Works by Levy Matthys & Panchyk Richard

Author:Levy, Matthys & Panchyk, Richard [Levy, Matthys]
Language: eng
Format: epub
Publisher: Chicago Review Press
Published: 2000-10-01T05:00:00+00:00

Build a Triangular Truss

MATERIALS

Drill

2 tongue depressors (available from a pharmacy)

Brass paper fastener

Rubber band

Figure 6.17

ADULT SUPERVISION RECOMMENDED.

Have an adult drill small holes near the end of the tongue depressors. Connect two tongue depressors with the fastener and connect the other ends of the tongue depressors with a rubber band. The rubber band should be loose enough so that the two tongue depressors and the rubber band form a triangle, but not so loose that the rubber band falls off. Stand the assembly upright with the rubber band at the bottom. If you push the peak of the triangular assembly down you will notice that the rubber band stretches. This implies that the rubber band is in tension. The two legs of the triangle made of the rigid tongue depressors are in compression. This assembly of such tension and compression elements is called a truss (Figure 6.17).

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