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iRubric: Straw Bridge Building rubric

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Straw Bridge Building Bridge Building All bridges must be made out of straws and tape. Bridge spans 30cm across the gap. Holds a weight for 10 seconds or more. Rubric Code: QXC778C By GAGDWM Ready to use Public Rubric Subject: Science Type: Project Grade Levels: K-5

Forces Acting on Structures: Plastic Straw Bridge
	Level 1 (N/A)	Level 2 (N/A)	Level 3 (N/A)	Level 4 (N/A)
Appearance	Level 1 Does not resemble any given bridge type (shapes, patterns, etc.) Work is sloppy throughout. Design is unattractive and/or plain.	Level 2 Resembles a given bridge type in a small way (shapes, patterns,, etc.) Design and use of tape is messy at times. Some visual appeal.	Level 3 Resembles a given bridge type (shapes, patterns, etc.) Tidy work most of the time. Visually appealing.	Level 4 Extremely good design. Looks like a given bridge type in every way (shapes, patterns, etc.)All constuction is clean and attractive Visually appealing.
Structure	Level 1 Bridge with no real design. Does not span a gap of 30 centimeters (unstable or incomplete). Did not maximize use of materials. Does not resemble type of bridge discussed.	Level 2 Bridge with limited creative design. Spans a gap of 30 centimeters, but remains unstable or incomplete in some way. Little thoughtful use of materials. Does not represent a discussed bridge design.	Level 3 Bridge designed with good creativity. Spans a gap of 30 centimeters, is complete and stable. Good use of materials. The design resembles one of the four bridge types	Level 4 Bridge designed with excellent creativity. Spans a gap of more than 30 centimeters is complete and stable. Excellent use of materials. The design clearly resembles one of the four bridge types discussed.
Explanation	Level 1 Can not describe the forces acting on the bridge Limited description of why you designed your bridge the way you did. No explanation as to how it will support the test weight.	Level 2 Describes some the forces acting on the bridge A brief description of why you designed your bridge the way you did. Limited explanation as to how it will support the test weight.	Level 3 Describes the forces acting on the bridge Good description of why you designed your bridge the way you did. Clear explanation as to how it will support the test weight.	Level 4 Thoroughly describes the forces acting on the bridge Clearly describes why you designed your bridge the way you did. Expert explanation as to how it will support the test weight.
Bridge Strength	Level 1 Holds less than 100g weight.	Level 2 Holds between 100g and 200g weight for 10 seconds or more.	Level 3 Holds between 200g and 500g for 10 seconds or more.	Level 4 Holds 1kg or more for 10 seconds or more.