How to Make a Strong Bridge Out of Popsicle Sticks

Build a strong bridge out of Popsicle sticks.
••• 'Kissing Bridge' Covered Bridge near Stowe in Vermont image by Rob Hill from <a href='http://www.fotolia.com'>Fotolia.com</a>

Building a bridge out of Popsicle sticks or toothpicks is a common project for a beginning physics class. The point of this exercise is to demonstrate distribution of force, capacity, resilience, strength and basic principles of engineering. The key to building a really strong Popsicle stick bridge is understanding where the stress or load bearing points of your design is. Once you've identified those areas, it is fairly easy to reinforce the bridge so it is capable of bearing weight up to 50 lbs. and flexing only to the standard of 1.5 centimeters.

    Draw the plans for your bridge to scale. Refer to an example of a Warren Truss bridge to help you create your design. On one piece of paper draw the bottom of the bridge. On the other two pieces of paper draw each side of your bridge (left and right). Mark the pieces accordingly so that when you are assembling the bridge later you know which piece goes where.

    Lay out the Popsicle sticks on the pieces of paper on top of the scale designs. Glue the pieces together using white glue and allow to dry overnight.

    Assemble the bridge and glue the bottom and side pieces into place. Examine the design and see if once assembled you can identify any weak points in your design. If you can, reinforce them with Popsicle stick subdivisions or more glue. Allow the project to dry overnight.

    Build the base using a base diagram. Measure 2.5 centimeters from the left edge and draw a line using your ruler. Measure 2.5 centimeters from the right edge and draw a line using your ruler. This divides your cardboard base into thirds. In the center third, cut a 4-centimeter square hole for the scale string needed to test the bridge. Draw a 5-centimeter square in the center of both the left and right third of the base. This is where your bridge will sit to test the load.

    Things You'll Need

    • Popsicle sticks
    • White glue
    • 35-by-15cm piece of cardboard
    • Three sheets of paper
    • Photo or example of Warren Truss design
    • Base diagram
    • Scissors or craft knife
    • Ruler

Related Articles

Geometric Concepts Found in Bridges
How to Calculate Axial Force
What Bridge Designs Are the Strongest for Science Projects?
How to Make a Bridge Out of Straws
Which Kind of Bridge Is Stronger: Arch or Beam?
How to Create an Architectural Drawing
How to Build a Strong & Stable Structure Project for...
How to Calculate Forces Acting on Beams
How to Calculate an AFQT Score
Scales Used in Technical Drawings
How to Read an E-Scale Ruler
How to Build an Elevator Pulley
How to Calculate the Circumference of an Oval
Levers Used in Everyday Life
How to Use Trigonometry in Engineering
How Do Pliers Work As a Lever?
How to Build a Catenary Curve Arch
How to Calculate Compressive Strength
Tips to Make a Strong Marshmallow Tower
How to Build the Laura Ingall's Cabin