Bridge Project Rubric



2nd Quarter Bridge Project

Purpose: to study the structural properties of bridges

to build a bridge and test is support capacity

to learn about science references and resources

Materials: balsa wood sticks (36 x 3/32 x 3/32 inches)

Purchase from Michael’s in Sterling. Ask for the type that Dr. Krovvidy

Ordered.

Elmer’s wood glue

Procedure: build a bridge that will span 30 (L) cm x 8 (H) cm x 8 (W) cm or less

bridge mass cannot exceed 20 grams

complete a force diagram showing the structural support

write a report about your style of bridge

Calculation: your bridge must be able to support 1000 times its mass

Report: a typewritten report on bridges with photographs (2 pages)

do a brief introduction explaining the different types of bridges

include history and physics of bridges, emphasis on the type

you chose

identify the structural components of your bridge

write on your team’s experience and procedure used

use reference books, science or engineering texts; refer to

internet web sites; document all sources of information



Grading: 3 to 4 students on each project team

all participants get the same grade

each student must participate equally

grade standard: see reverse

Due Date:

Final Results:

bridge name:_________________ Team: _______________

mass of bridge: __________ g _______________

support mass: __________ g _______________

support ratio: __________ ________________

Grading Rubric

Summative: Bridge Support structure / Design: 30 + 30 = 60 points

Formative: Report / Force Diagram : 40 points

Do NOT make a Beam Bridge EVER!!

|Bridge Project Rubric |

|Looking For… |Way! |Part Way |No Way |Scoring |

| | | | |Quality of Report |

| | | | | |

| | | | |/10 |

|Report – Documentation |Bibliography with wide |Partial listing of one or |Bibliography missing |Documentation |

| |selection of references from |two references | | |

| |books, periodical and internet| | | |

| |sites | | |/5 |

|Force Diagram – your bridge |Accurate drawing of your |Drawing is missing one or |Drawing does not |Bridge Diagram |

|diagram |bridge – not every stick needs|more critical structures |represent the bridge at| |

| |to be shown | |all |/10 |

|Force Diagram – Vector lines |Force vectors lines with |Some force vector lines are |Force lines are missing|Vector Force Diagram |

| |arrows accurately display how |accurate, but important ones|or do not show that | |

| |the bridge supports the road |are missing |structure at all | |

| |surface | | |/10 |

|Bridge structure – Mass |Calculate the mass to support |Calculate the mass to |Calculate the mass to |Ratio > 50:1 15 pts |

|compared to support amount |ratio and it exceeds 100 : 1 |support ratio and it is |support ratio and it is|Ratio > 75:1 18 pts |

| |by a considerable margin |between 50 and 100 : 1 |less than 50 : 1 |Ratio > 100:1 20 pts |

| | | | |Ratio > 500:1 25 pts |

| | | | |Ratio > 600:1 26 pts |

| | | | |Ratio > 700:1 27 pts |

| | | | |Ratio > 800:1 28 pts |

| | | | |Ratio > 900:1 29 pts |

| | | | |Ratio > 1000:1 30 pts |

|Bridge structure – Design and |Bridge uses or modifies one of|Bridge copies a trivial |Bridge design shows |Creativity/Workmanship |

|creativity, workmanship |the standard structural types |design type with little |very little thought or | |

| |with creativity and ingenuity.|imagination |design creativity | |

| |Neat and without glue sticking|Somewhat neat, some glue |Messy, irregular, with | |

| |out |showing |splinters & glue | |

| | | |showing |/30 |

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