TO DESIGN AND BUILD A BRIDGE WHICH CAN BE TESTED FOR
STRUCTURAL STRENGTH AND THEN ANALYZED FOR THE FORCES
ROUND OR FLAT WOODEN TOOTHPICKS
ELMER'S WHITE GLUE
EACH STUDENT WILL RESEARCH BRIDGE DESIGNS FROM
LITERATURE OR ACTUAL STRUCTURES NOTING BRACING POINTS
AND REINFORCEMENTS AND HOW EACH DESIGN TAKES INTO
ACCOUNT GRAVITATIONAL AND LOAD FORCES AND THE
MATERIALS USED. EACH STUDENT WILL THEN DESIGN AND
BUILD A BRIDGE USING WOODEN TOOTHPICKS AND ELMER'S
THE TOTAL WEIGHT OF THE FINISHED
BRIDGE CANNOT EXCEED 40 gm
ANY DESIGN CAN BE USED AS LONG AS THE ROADBED IS FLAT
AND UNOBSTRUCTED TO ALLOW A MATCHBOX CAR TO TRAVEL
THE BRIDGE MUST BE FREE STANDING AND ALLOW FOR A 2 cm
X 30 cm BOARD TO PASS UNDER THE BRIDGE WHILE IT RESTS
ON A FLAT SURFACE.
ONLY THE MATERIALS LISTED MAY BE USED TO BUILD THE
EXCESSIVE AMOUNTS OF GLUE MAY NOT BE USED AS PART OF
THE STRUCTURE, i.e. THE BRIDGE MAY NOT BE COMPLETELY
COVERED WITH GLUE.
TO TEST EACH BRIDGE'S STRENGTH WE
WILL PLACE THE BRIDGE ONTO AND BETWEEN TWO
FLAT-TOPPED TABLES SPACED 25 cm APART.
AN 8" WOODEN DOWEL WITH A 1/2" DIAMETER IS
SET ACROSS THE MIDDLE OF THE ROADBED. TWO LOOPS OF
STRONG CORD ARE ATTACHED TO THE HANDLE OF A 5 gal
BUCKET. EACH LOOP OF CORD IS THEN LOOPED OVER EACH
END OF THE DOWEL TO SUPPORT THE BUCKET BELOW THE
BRIDGE. SAND OR WATER IS ADDED TO THE BUCKET UNTIL
THE BRIDGE BREAKS. THE BUCKET AND ITS CONTENTS ARE
EACH BRIDGE WILL BE RANKED USING A
RATIO OF LOAD WEIGHT TO BRIDGE WEIGHT.
Sample Plans for Tooth Pick
Below you will see links to quite a
few different bridge designs from over the years. You
will find both the winning bridges from each year,
and the ones that did not hold as much weight. Maybe
this will give you a good idea of the different types
of bridges turned in by students.
[ TOOTHPICK BRIDGES ] [ Rebecca Howell ] [ David Watkins ] [ Ryan King ] [ Matt Stiggins ] [ Allison Cole ] [ Scott Seaton ] [ Jason Morris ] [ Nathan Clariday ] [ Monica Carnahan ] [ Kristal Taylor ] [ Chad Fry ] [ Daniel Belcher ] [ Nicole Holmes ] [ Bridge Journal ] [ Physics Project Toothpick Bridge Journal ] [ Bridges 97 ] [ Bridges 98 ] [ Bridges 99 ] [ Bridges 2000 ]