3. Results

3.1 Designs
Our first draft designs:


Bridge 1: Deck truss
Bridge 2: Deck and Through Truss


Bridge 3: Through Truss


In the end, we changed the designs and decided to build the 3 chosen bridges shown below.


Our Final Designs:


Bridge 1: Constant (no design, acts as an constant)
Bridge 2: Through truss
Bridge 3: Deck Truss


3.2 Videos of the experiments and a table for results


Video for bridge 1:
Weighting of bridge+breaking of bridge:


Video for bridge 2:
Weighting of bridge:
Breaking of bridge part 1:
Breaking of bridge part 2:


Video for bridge 3:
Weighting of bridge:
Breaking of bridge:


Bridge
Mass of bridge (kg)
Mass the bridge is able to hold (kg) *
Efficiency
Bridge 1 (Without deck or truss, constant)
0.2
6.8
3.4
Bridge 2 (With truss)
0.5
46.8
9.4
Bridge 3 (With deck)
0.4
16.8
4.2
Table 1. Results for all 3 bridges

*inclusive of the weight of metal tin (4.5kg) and the weight of the metal bar (2.3kg)

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