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Bridge

# Bridge - Bridge Building Kyle Daniele Michael Gonzalez...

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Bridge Building Kyle Daniele, Michael Gonzalez Performance:12/12/08 Due Date:12/23/08 Physics Mr. Sforza

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Introduction: 1) Objective: To observe the vital role of bridges and the issues that must be considered when constructing a bridge. 2) Method: We first drew sketches of what we wanted our bridge to be. Then we constructed the bridge from balsa wood and finally testing it by seeing how much weight it will hold. 3) Results: Our bridge was able to sustain 7.5 kg of weight before completely breaking. Experimental Procedure: We first found information on the type of bridges, how each type is built according to the principles of engineering, the forces that act upon each type, and the strengths and weaknesses. Once we had this information we made a blueprint of our design and built it with balsa wood. We then tested the amount of weight it can hold by tying a bucket at the bottom of the bridge and filling it with weights. Discussion: Engineering Efficiency E=Efficiency = (Load in kg)(1000 grams) (Mass of bridge in grams) (7.5 kg)(1000g) = 131.8 kg (56.9 g)
Bartlett Efficiency a=Bartlett Efficiency= (Mass of Load in kg)(9.8m/s^2)(1000grams) (Mass of Bridge in g) (1 kilogram) (7.5kg)(9.8m/s^2)(1000grams) = 112.5 m/s^2 (56.9g)(1 kg) 1. List and describe the major types of bridges. Beam - The beam type is the simplest type of bridge. The beam bridge could be anything as simple as a plank of wood to a complex structure. It is made of two or more supports which hold up a beam. Arch - In the arch type of bridge, weight is carried outward along two paths, curving toward the ground. Suspension/Cable-stayed - The deck (trafficway) of a suspension bridge is hung by cables which hang from towers. The cables transfer the weight to the towers, which transfer the weight to the ground. Cable-stayed bridges have towers, but cables from the towers go directly to the road deck, instead of spanning from tower to tower.

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