This is an awesome STEM challenge for young kids and older ones too! Explore forces, and what makes a spaghetti bridge strong. Get out the pasta and test our your spaghetti bridge designs. Which one will hold the most weight? We have tons more fun STEM activities for you to try! 


How Strong Is Spaghetti?

What makes a pasta bridge strong? Your spaghetti noodles are under certain forces when they are holding weight; compression and tension.

Let’s look at how a bridge works. When cars drive over a bridge, their weight pushes down on the bridge surface, causing the bridge to bend slightly. This puts the forces of tension and compression on the materials in the bridge. Engineers have to design the bridge to make sure it is strong enough to handle these forces.

What spaghetti bridge design will hold the most weight? Get our free printable STEM challenge project below and test out your ideas today!

Free Printable Strong Spaghetti Project!

Strong Spaghetti Bridge Challenge

Here is one way you can design a spaghetti bridge and test its strength. Alternatively, hand out a bunch of spaghetti and tape, string or glue to groups and encourage kids to come up with their own designs. See our tips further below.


  • Spaghetti noodles
  • Rubber bands
  • Stack of books
  • Cup
  • String
  • Paper clip
  • Marbles


STEP 1: Poke two holes in your cup and connect with your string.


STEP 2: Bend your paper clip and attach to your string so it holds the weight of your cup.


STEP 3: Create two stacks of books that are high enough to keep your cup off the ground.


STEP 4: Place one uncooked spaghetti noodle across the gap between your stack of books and then attach your cup to it. Is a piece of spaghetti strong enough to hold the weight of the cup?


STEP 5: Now add one marble at a time and observe the spaghetti. How many marbles did it hold before breaking?


STEP 6: Now gather together 5 strands of spaghetti and attach them with rubber bands. Repeat the same experiment. How many marbles can it hold now?


Strong Spaghetti Tips

Here are a few things to consider when coming up with your spaghetti bridge designs:

Strong Shapes

Triangles are one of the strongest geometric shapes and provide excellent stability in bridge design. Incorporate triangles into your spaghetti bridge by creating truss patterns or using triangular supports. This helps distribute weight evenly and prevents the bridge from collapsing under load.

Use Multiple Layers for Reinforcement

Strengthen your spaghetti bridge by using multiple layers of spaghetti. By stacking and interweaving spaghetti strands, you can create a stronger and more resilient structure. Consider alternating the orientation of spaghetti layers (e.g., horizontal and vertical) to maximize stability.

Optimize Load Distribution

Distribute the load evenly across the bridge to prevent stress concentrations at specific points. Position support columns strategically to minimize bending and ensure that weight is distributed uniformly along the length of the bridge. Avoid placing heavy loads directly on unsupported sections of the bridge.

Incorporate Compression and Tension Elements

Balance compression (pushing forces) and tension (pulling forces) within your spaghetti bridge design. Use thicker spaghetti strands or bundles to resist compression forces, while thinner strands can be used for tension elements such as cables or suspension wires. This ensures that the bridge can withstand both downward and lateral forces.

By following these tips and applying principles of structural engineering, you can create a spaghetti bridge that is both strong and durable. Remember to approach the design process with creativity, and don’t be afraid to experiment with different techniques until you find the best solution.

More Fun STEM Challenges To Try

Spaghetti Marshmallow Tower – Build the tallest spaghetti tower that can hold the weight of a jumbo marshmallow.

Paper Bridges – Similar to our strong spaghettti challenge. Design a paper bridge with folded paper. Which one will hold the most coins?

Paper Chain STEM Challenge – One of the simplest STEM challenges ever!

Egg Drop Challenge – Create your own designs to protect your egg from breaking when it is dropped from a height. 

Strong Paper – Experiment with folding paper in different ways to test its strength, and learn about what shapes make the strongest structures.

Marshmallow Toothpick Tower – Build the tallest tower using only marshmallows and toothpicks.

Gumdrop Bridge – Build a bridge from gumdrops and toothpicks and see how much weight it can hold.

Cup Tower Challenge – Make the tallest tower you can with 100 paper cups.

Paper Clip Challenge – Grab a bunch of paper clips and make a chain. Are paper clips strong enough to hold weight?

Printable STEM Pack For Kids

80+ Doable Engineering Projects in one convenient pack!

  • Full instructions with sample images
  • Activity-specific instruction sheets
  • Data Collection Sheets
  • Questions for Reflection
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  • Great marshmallow challenge: A classic challenge kids love!
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