iRubric: Balsa wood Bridges rubric

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Balsa wood Bridges

Bridge to be made out of 144" of balsa wood sticks. Width of bridge deck must be a 2 1/2 inches. The bridge must have a span of exactly 8 1/2 inches. The total overall bridge height must be between 2 - 4 inches above deck OR 1-2 inches below. The bridge must be able withstand a minimum of 10 bars of weight without failing.

Rubric Code: SXX5WB7

By b0307082

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Public Rubric

Subject: Vocational

Type: Project

Grade Levels: 6-8

Forces Acting on Structures: Stir Stick Bridge
	Level 1 (N/A)	Level 2 (N/A)	Level 3 (N/A)	Level 4 (N/A)
Structure 15 % Investigate and analyze forces within structures, and forces applied to them	Level 1 Basic beam bridge (no real design) Does not span a gap of 8 1/2" (unstable or incomplete) Width is not 2 1/2". Measurements way off. Did not maximize use of materials	Level 2 Beam or arch bridge with limited creative design (e.g. no trusses used) Spans a gap of 8 1/2", but remains unstable or incomplete in some way) Width is 2 1/2" Measurements off. Limited use of materials.	Level 3 Beam or arch bridge designed with good creativity Spans a gap of 8 1/2", is complete and stable Width is 2 1/2" Measurements may be off a little. Good use of materials	Level 4 Arch bridge designed with excellent creativity Spans a gap of 8 1/2" is complete and stable Width is 2 1/2". Joints used 3/8 by 3/8 inch sqaures. All measurements match. Excellent use of materials
Appearance 10 % Investigate and analyze the properties of materials used in structures	Level 1 Not aesthetically pleasing (shapes, patterns, etc.) Work is sloppy throughout Design is unattractive and/or plain.	Level 2 Limited aesthetics (shapes, patterns, etc.) Design and use of glue is messy at times. Some visual appeal glue use..messy	Level 3 Overall, an attractive bridge (shapes, patterns, etc.) Tidy work most of the time Visually appealing	Level 4 Extremely aesthetic in design (shapes, patterns, etc.) All construction is clean and attractive. Visually appealing
Weight Held 50 % Investigate, analyze the properties of materials used in structures	Level 1 Failed before reaching 10 bars.	Level 2 Failed with 10-20 bars.	Level 3 Failed with 20-30 bars	Level 4 Holds more than 30 bars
Blueprint 5 % - sketch<BR> Demonstrate and describe processes used in developing, evaluating and improving structures that will meet human needs with a margin of safety	Level 1 Bridge design does not match the design of the blueprint and changes were not explained.	Level 2 Bridge design somewhat matches the design of the blueprint. If any changes were made during building, they were explained.	Level 3 Bridge blueprint mostly matches the design of the finished product. If any changes were made during building, they were sufficiently explained.	Level 4 Bridge blueprint matches the design of the finished product. If any changes were made during building, they were thoroughly explained.
Teamwork 20 % Work collaboratively on problems; and use appropriate language and formats to communicate ideas, procedures and results	Level 1 Partners ..no team work.. one person ran the show! No respect shown.	Level 2 Partners ..some team work Some respect shown.	Level 3 Partners were working together, but some were distracted from their project. Respect was observed at times.	Level 4 Each person was actively involved in the building process. All partners were treated with respect.

Keywords:

bridge, structures, forces, science

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Project

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