BASIC
CRITERIA-10 POINTS (YOU WILL NOT BE ALLOWED TO TEST IF YOU FAIL HERE.)
EXCEEDS
24 INCHES IN LENGTH
EXCEEDS
3 INCHES IN WIDTH
USED
ONLY ALLOWED MATERIALS
HAS
A HOLE IN CENTER
ENGINEERING
NOTEBOOK-20 POINTS
BEFORE
YOU BUILD
SKETCH A SIDEVIEW(GREATER THAN 24
INCHES)
SKETCH A TOP VIEW SHOWING THAT YOUR
BRIDGE IS GREATER THAN 3 INCHES AND DEMONSTRATING CONNECTIVITY.
INCLUDE MAGNITUDES AND STRESS RATIO’S
OF SIDEVIEW.
AFTER
YOU TEST YOUR BRIDGE
SKETCH A VIEW THAT SHOWS WHERE YOUR
BRIDGE FAILED FIRST.
EXPLAIN HOW YOU CAN IMPROVE YOUR
BRIDGE
FINAL
BRIDGE
REDRAW SIDEVIEW WITH IMPROVEMENTS
REDRAW TOP VIEW
WRITE A PREDICTION OF HOW MUCH IT
WILL HOLD AND WHERE YOU EXPECT IT TO FAIL.
AFTER
THE TEST
IDENTIFY WHERE YOUR BRIDGE FAILED
FIRST WITH RED MARKER, RED PEN, RED CRAYON, OR RED PENCIL.
HOW CLOSE WERE YOU TO YOUR PREDICTION?
PERFORMANCE-40
POINTS
POINTS
SUPPORTS SELF5
LESS THAN 5LB20
LESS THAN 10LB25
LESS THAN 15LB30
LESS THAN 20LB35
LESS THAN 25LB40
OVER 25LBEXTRA
POINT PER LB
RULES
MATERIALS
SPAGHETTI
2 POUNDS
GLUE
STICKS-38 skinny 4” sticks(0.34lbs)
3
PIECES OF LASAGNA(0.15lbs)
Total weight of approximately 2.5
pounds!!!
RULES
CREATE
A BRIDGE WITH ALLOWED MATERIALS THAT CAN HOLD THE MOST FROM ITS CENTER.BRIDGE WILL ONLY BE SUPPORTED AT EACH
END.SUPPORTS ARE 24 INCHES APART.
BRIDGE
MUST EXCEED 24 INCHES LONG AND 3 INCHES WIDTH.
STUDENTS
WILL ADD LOADS TO BRIDGE NOT INSTRUCTOR.
WEIGHTS
WILL BE ADDED UNTIL BRIDGE FAILS.TO
GAIN CREDIT FOR ADDED WEIGHT, BRIDGE MUST CARRY IT(WITHOUT TOUCHING FLOOR OR
ANY OTHER SUPPORT) FOR A THREE COUNT.
AFTER
FAILURE, STUDENTS WILL REMOVE LOAD,
GRAB BRIDGE, AND CLEAN UP ANY MESS.
BUCKET
WITH EARNED WEIGHTS WILL BE IMMEDIATELY
PLACED ON A DIGITAL SCALE TO BE
MEASURED.THIS WILL INCLUDE, BUCKET, HOOKS, AND ALL WEIGHTS.THE BRIDGE
WILL NOT BE INCLUDED IN THIS MEASURE.
FOR
THE PURPOSES OF GRADING, YOU WILL KEEP THE BEST OF YOUR TWO SCORES.
TOP
PERFORMERS WILL APPEAR IN THE CLINTON LOCAL.
GOOD LUCK!
MD Solids application can be used to quickly create a truss with balanced forces. open the application and select Truss. set the grid(top numbers are 1) (bottom entries are 20). place members(understand that a joint is created each time to attach members). place supports on each end, hold down mouse and move to outside to change support from roller to pinned. place a load at the center joint and push the calculate button.
West Point Bridge application can be used to test your truss idea and see a 3 dimensional representation of your design.