bridge building science experiment

10 Easy Bridge Building STEM Challenges for Kids

We see bridges and drive, and walk, over them all the time. However, we typically don’t spend a lot of time thinking about how they are built or how they can hold so much weight. However, there is a lot of planning, engineering and science that goes into bridge building. Encourage kids to look at the bridges around them in a whole new way, by building their own with these 10 Easy Bridge Building STEM Challenges for Kids .

My favorite part of doing STEM challenges with my kids, and students, is watching as they build and create. I have done countless STEM challenges in the classroom over the years, and without exception, the children have always come up with ideas and solutions that I would never have thought of. Their creativity always amazes me.

Children create without preconceived ideas of what a bridge or other structure should look like. With STEM challenges, they problem solve as they experiment and learn that if something doesn’t work, it’s not a failure, but rather a learning opportunity.

As STEM challenges are becoming more and more common and encouraged in schools, it makes me very happy and excited to for our future when I see what children create.

I’m sure many of you have had a bridge building project come home from school or perhaps you remember building a bridge when you were in school. It’s a common STEM challenge because it is meaningful and there is so much learning that comes from it.

If you are looking for a hands-on STEM challenge for home, or preparing a building unit at school, or specifically a build a bridge STEM challenge, these 10 STEM bridge building challenges are a great place to find ideas!

Once you’ve check out all of this collection, make sure to visit the second collection of 9 Best Bridge Building STEM Challenge Ideas .

Bridge Building STEM Challenges

STEM challenges are activities that incorporate S cience T echnology E ngineering and M ath. Ideally the activities include all of these subjects, however, any activity that focuses on at least one of these skills is a STEM activity. Recently A rt has been added to some of these activities, making them STEAM activities.

Kids of all ages benefit from STEM challenges. Young children tend to play more and experiment with their toys as they build and play. Older children often start to lose this as they get older. STEM challenges are a great way to keep this engineering and hands-on experimenting alive.

For all STEM challenges remind children that simply trying and not giving up is a huge part of the activity. Even scientists and engineers experiment and are not always successful as they plan their projects. What makes them successful is that they don’t give up. They learn from what went wrong and take what they learned and implement it into their next plan.

Preparing a Bridge Building STEM Challenge

To start a STEM challenge, let children know specifically what their challenge is. For many of the STEM challenges below, it is as simple as “Build a bridge that can hold some weight” or “Build a bridge to span over a certain area”. Keep it simple, and let kids come up with their own solutions.

Many STEM challenges use simple materials to build with. This is great for hands-on projects since children are already familiar working and playing with the materials.

When doing the challenge, allow kids to come up with any solution they feel works. I am always amazed at all the different ideas and creations that children come up with.

So grab a few materials and start building!

The list below includes some ideas that include several pictures and a full description. Other ideas include a link to click for a full and complete description.

#1 Popsicle Stick Bridge Challenge

This bridge building challenge is also a great introduction to STEM challenges. Children are simply given popsicle sticks and elastics. The challenge is to build a bridge that can hold weight.

To test these bridges, the popsicle stick bridge is set across two chairs, or tables, and then weight is applied. You can add to this challenge by making different requirements. Some ideas include:

• Specifying the length of the bridge
• Limiting the number of popsicle sticks and/or elastics
• Making a height requirement

Depending on the age of the children, the bridges will likely look different. Some children may show their understanding of the shapes used to make bridges, or the strongest shapes, such as triangles. They may incorporate this information into their building. It is a great opportunity to use and test this knowledge.

#2 Building Blocks STEM Bridge Building

Another really simple STEM challenge is this building blocks bridge. Simply give children plastic building blocks and a sheet of blue paper for this “ Build a Bridge STEM Challenge “.

This is a great challenge because, similar to the first challenge idea above, it uses simple materials that children are already familiar with. Children likely already know how to build with and connect the pieces.

It is also a great challenge because if your children are anything like mine, they already love building with the blocks. This interest will keep kids engaged and excited about the STEM challenge.

Have children set the sheet of paper down flat and ask them to pretend that it is water or a stream. Next, challenge them to create a bridge that can go from one side to the other without touching the water, or falling in the water, and they can only use the building blocks.

This was great when I did it with children in kindergarten. No two bridges were the same!

#3 Bridge STEM Challenges

Hang onto the building blocks from the last challenge for this STEM activity. Challenge the kids to build a bridge that can hold a can of food – or several cans! There are different ideas for the materials that children can use to build with.

It’s a simple idea, but a great way to keep kids busy and problem solving as they play. Click here to view the full Hold a Can Bridge Building Activity.

#4 STEM Challenges with Acorns

How neat is this bridge building idea? All you need are acorns and play dough.

Can kids build an acorn bridge that supports a LEGO car? Of course, they can! Click here for an acorn STEM challenge.

#5 Simple STEM Challenge

Grab some paper and pennies/coins for this STEM challenge.

Quick and easy to set up paper bridge building STEM challenge to see who can build the strongest bridge! Click for the simple paper and pennies bridge.

#6 Popsicle Stick STEM Engineering

Recapture the magic of engineering with this super-fun popsicle stick bridge engineering challenge. Click for engineering challenge.

#7 Straw Bridge Building STEM Challenges

In this straw bridge STEM activity, your students and children will be given a bundle of straws, a pair of scissors, and a roll of clear tape.

Their objective… to design and construct a bridge that can span a distance of one foot and bear a reasonable amount of weight without collapsing.

Try this STEM challenge today.

#8 Castle Drawbridge STEM Activity

Learn how to build a working drawbridge with this engineering + art STEAM activity that can be used for a castle or to operate a moveable bridge.

This castle STEAM challenge pairs art and engineering to challenge kids to make a working drawbridge. For full activity details click here.

#9 Play Dough Bridge Building Challenge

My kids always love playing with play dough. I wanted to incorporate their interest in this building material by using the play dough and popsicle sticks for a STEM challenge. It is an easy STEM challenge to give children because it uses familiar building materials that you probably already have on hand.

I used this activity in the fall and children were challenged to build a bridge over a ‘stream of water’ (a sheet of blue construction paper), to get a few mini pumpkins from one side, back to the pumpkin patch. My students came up with countless solutions to this STEM challenge!

For the play dough, tongue depressor STEM challenge, click here.

#10 Rainbow Bridge STEM Challenge

This idea is great when you are catching leprechauns, but it is such a great activity to try any time of year.

Learn how to build a rainbow bridge using a variety of supplies such as paper, craft sticks and more. Determine which designs make the strongest bridge in this STEM Challenge. Rainbow bridge activity.

#Bonus! Real Bridges Around Us

Before, or after, learning about bridges, show children all about the real thing with these photos and information about one of the most famous and beautiful bridges in the world.

Learn all about the Golden Gate Bridge.

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100+ STEM Challenges Activity Cards

If you are looking for more activity ideas to use with virtually any collection of materials, from wooden blocks and paper rolls to straws and string, there are endless ideas to help you bring STEM to your classroom or home.

Over 100 printable STEM Building Challenges!

More Hands-On Teaching Ideas

If you like the 10 bridge building STEM challenges above, you’ll also love the activities below. From a collection of over 45 STEM challenges and more simple challenge ideas, you’ll find lots to keep kids busy and learning!

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Science at Home for Kids

Easy and fun science experiments using household items! Follow us on Instagram @scienceathomekids for more cool science!

Building a Self-Supporting Bridge

Today’s science experiment deals with physics! We are going to create a bridge without tape or glue that stands by itself and can support a lot of weight. This bridge was first designed for the Sultan of the Ottoman Empire in the early 1500’s by a man named Leonardo da Vinci. However, the bridge design was rejected, so the bridge was never built. Today we are going to create a mini version of the bridge using pencils and rubber bands.

What you need:

• 27 rubber bands

• Attach 3 rubber bands to each pencil- one an inch from the end of the pencil on each side and one in the middle.

• Using this picture, try to create the da Vinci bridge on your own. The rubber bands help keep the pencils from sliding in some spots, but you may have to adjust the locations of some of the rubber bands. If you get stuck and need help building, click here for a helpful guide.

• Place weights and other items from around your house on top of the bridge. See how much weight yours can hold! Ours has 4 pounds on it in this picture.

How does the da Vinci bridge work?

When the bridge is first assembled, the pencils are slightly loose and can slide around because of the low weight of the pencils. When a load (such as the weights on our bridge) is applied, the central beam spreads the weight throughout the structure, and the beams become rigid. The force makes the pencil connections tighten, therefore increasing the stability of the bridge.

Great post! I can’t wait to keep reading your blog!

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Science Project Ideas

How to Build a Toothpick Bridge

Toothpick Bridge is a great Science project to test your Physics and engineering skills. The way you design it is important because your bridge should have a proper balance while at the same time being sufficiently strong. You can choose to do an arched bridge or a regular rectangular one. Keep a few design blueprints handy so that you are equipped with a backup if one design fails to shape up according to your requirements.

Toothpick Bridge Designs

Before starting the construction, it is important to decide on the design of your bridge. For this, you can go through good books on bridges with illustrations. While almost all bridges have the basic structure of a deck (the horizontal surface you walk or drive on) supported by piers (vertical formations) there may be pronounced variations in their patterns. Enlisted here are a few common designs of bridges. Take your pick.

Arch Bridge

This one has a deck supported by an arch below it. The arch is built from either end of the bridge and can have a pillar or any vertical structure at its center. These bridges are suitable for shorter spans. In this connection, span refers to the distance between two piers.

Beam Bridge

This bridge consists of a deck supported at its two ends by piers. A truss bridge is a befitting example of this type. A truss is a structure made of triangles which make it very strong to withstand heavy weights. Earlier we had wooden trusses which have now been replaced by steel ones. In your project, however, you will be making the trusses by joining toothpicks.

Suspension Bridge

The deck of this bridge is suspended from cables by vertical suspender cables. The former cables run between towers which are built on the abutments at each end of the bridge. Abutments support a bridge on either side and connect it to the ground. These bridges can have very big spans.

Make a Toothpick Bridge

Toothpick bridge materials.

• Graph Paper
• Glue or marshmallows

Step-by-Step Instructions

• Sketch the model of your bridge on the graph paper. It’s recommended to give a square foundation to your model, because such a base will make the bridge strong.
• Spread wax paper over the sketch and trace out the drawing on the wax paper.
• Put the toothpicks over the pencil marks on the wax paper and glue them together. You can also insert the toothpicks into marshmallows which can secure the junctions of your bridge.
• Hold the framework upright. One side of your bridge is made.
• Now create another similar toothpick framework of the bridge on the wax paper.
• Pull out the framework from the paper and make it stand upright. You are done with the other side of the bridge
• Now join the two sides together by multiple toothpicks to hold the two sides of the bridge
• You can make a truss out of toothpicks and use as a connector to the two sides. Triangles are known to form very stable structures.

Strongest Toothpick Bridge Design

The strongest toothpick bridges have very big ratios of their own weight to the maximum weight they can handle. Organizers of most bridge-building contests rank these bridges, highly. It should also have the capacity to withstand tension, that is, the force which tends to pull apart or elongate the bridge. Another force to handle is compression, which tries to exert a push on the bridge and shorten it in the process. In addition to that, natural phenomena like wind currents, rainfall should also be combated.

The various designs of bridges can be tried to see which structure gives maximum support. A beam bridge can hold up a great weight albeit for very short distances while suspension bridges can tackle tension and torque (turning effect of a force) effectively over a long distance. After construction, run proper tests to check the strength of the bridge.

Testing the Bridge

Add a few weights to judge the capacity of the bridge. For instance, put coins or paper clips one at a time over the bridge to check. Don’t start by putting very heavy objects like bricks over it. It can collapse in no time and more than you not liking it, it’s not at all the correct way of testing the strength of your bridge. Use refined methods, like suspending a small plastic bucket from different points of the span to identify the weak points if any. Start with a small quantity of water and gradually increase the level.

While piling up coins at one point on the bridge, keep this in mind – real bridges mostly have vehicles running across them. Nothing heavy really stands on them for a long time. Hence, make amendments in your testing mechanism accordingly.

If you find any problems with the design, you need to add more buffering at the sensitive points or you might reconsider the design altogether, in case of large discrepancies. More than winning a contest, the motivation for building the best bridge should be learning how these useful constructions of daily life can be built with minimal materials but maximum strength.

Tips for Better Results

• Use a very good quality of glue.
• Keep the requisite number of toothpicks handy. Ensure that they are strong enough by checking if they snap on bending a little.
• Instead of using a single toothpick for a support beam, use groups of toothpicks stuck together to make the structure sturdy.
• Give the glue time to dry before continuing adding on to the bridge.
• Keep the spacing between the intersections of the toothpicks uniform.
• While testing the strength of your bridge, look out for any bending in the toothpicks. Your bridge will bend before breaking. Stop loading it any further at this point.

Toothpick Bridge Plans

Here are a few toothpick bridge plans in pictures.

Hope you found this article useful and already have a design in your mind to start working on.

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How To : Build a Simple Paper Bridge as a Science Experiment

Every day we pass bridges , whether it's a foot bridge, a highway overpass, a span over water, or a viaduct over a valley. We pass on these structures without even thinking of the engineering genius that went into their design and construction, let alone the science behind their strength.

Beam, truss, arch, suspension : each type of bridge varies in design, distance, and their ability to negotiate the forces of tension and compression. Depending on the purpose of the bridge, how much weight it will need to hold, and how far it will need to traverse, engineers can figure out which bridge is the right bridge.

The Question

In this classroom experiment from Thinking Out of the Beaker 's Video Laboratory Series, created by Jeffrey Major , a science teacher in Southwestern Ontario, students are tasked with answering the question: How do design changes affect a load bearing structure?

Before bridge construction begins, students are asked to predict which bridge design they think will be able to withstand the largest load.

A bridge uses tension and compression to balance itself and keep it standing. These two opposing forces work together to create an equilibrium in a bridge's structure. A bridge will buckle if compression, the force pushing down on it, becomes too much; it will snap if tension, the force pulling on it, overwhelms.

To build the paper bridges, students will use all the same materials:

• index cards for the bridge
• pennies for the load
• markers, pencils, books, or something else for bridge supports on the ends (aka abutments or piers)
• scissors (to cut the cards)
• ruler (to ensure all bridges are of equal distance)

Method 1: Single Strip Bridge

A single index card (or strip from an index card) is placed across two supports. Then, pennies are added one at a time until the bridge collapses and touches the tabletop. In this case, three pennies does the trick.

Method 2: Three-Strip Bridge

Three strips cut from an index card are stacked together and placed across two markers. Again, pennies are added one at a time until the bridge collapses and touches the tabletop. In this case, three pennies also does the trick.

Method 3: Glued Three-Strip Bridge

Three strips cut from an index card are glued or laminated together and placed across two markers. And yes, those Abe Lincolns are once again stacked one by one until the bridge falls and touches the tabletop. This time, ten pennies does the bridge in.

Method 4: Channel-Folded Bridge

An index card is folded into a channel and placed across two markers. This time, stacks of pennies are added one by one until the bridge breaks or until you run out of pennies. While only 45 pennies can be seen below, the bridge can handle much, much more than that.

The Results

And the winner is Method 4, proving that design changes do have an effect on load bearing structures. By simply folding the index card into a channel, the bridge was able to withstand more than seven times its nearest challenger, and likely more. In the video, the experiment ends because the load becomes too unstable and crashes. The bridge itself remains standing.

This is a fun, simple experiment that can easily get kids excited about science and looking at the world around them through a different lens. Bridges!

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The 3 bonded sheets do not have accurate results because the paper is strengthened disproportionately based on the structural strength the hardened glue provides. Repeat with the paper bonded using staples so that the glues rigidity will be factored out of the test results.

Can't wait to try this with my 8th graders tomorrow!

can u plz... explain me why the last bridge is stable than the other...

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Science Projects > Physics & Engineering Projects > Bridge Science  

Bridge Science

Bridge Science Projects

Build a Paper Bridge

Do you think you can you build a bridge out of paper? Try it out and then see if you can make it stronger with these tips.

What You Need:

• a sheet of paper
• a few thick books
• pennies or other weights

What You Do:

1. Make two supports for your bridge by stacking books into two stacks that are the same height. They should rise several inches off of the table or floor and be about 6″ apart from each other.

2. Lay a plain sheet of paper across the stacks of books. There should be an even amount of paper over each stack.

3. Place a penny, paperclip, pencil, or other light object in the center of the paper. Does your bridge support the weight? If so, add more until it collapses. If not, try to make it stronger.

4. A sheet of paper is very thin and without anything to support it in the middle, it will collapse easily. Can you think of any ways to make your bridge stronger? You could move the supports (stacks of books) closer together, or try folding the paper in different ways to make it stronger. Here are some tips:

• Fold the sheet in half the short way so that you have a long, narrow piece. Tuck the ends under the flaps of the top book in each of your stacks and push up on the paper to make an arch (you may need to push the book stacks closer together). The extra layer of paper makes it slightly thicker and the arch shape can support more weight than a flat sheet of paper.
• Unfold the paper. Fold the short ends over twice to meet the center, so that you have 5 fold lines. Bend the paper up along the folds to make a four-sided box. Set it across the stacks of books and test it.
• Fold it accordion-style into a series of zigzags (you can start with a new unfolded sheet of paper). Start at bottom (short end) and fold the edge up a little more than an inch, then flip the paper over so that the folded flap is facing the table. Fold the already folded flap up the same amount. Flip the paper again and continue folding back and forth so that the folds make a zigzag pattern. Stretch the paper out slightly and set it across the space between the books. This triangular folding makes the bridge stronger, just like a truss bridge, because the weight is spread out more over the triangular shapes. This is why corrugated cardboard is stronger than ordinary cardboard – the folds inside of it make it more rigid. Try adding even more folds – does it make the bridge even stronger?
• Can you think of any other ways to fold your paper? Which makes the strongest bridge?
• Can you think of materials you have around your house that you could use to make a stronger bridge?

Arch Bridge Activity

Arches are one of the oldest types of bridge. Try this activity to learn more about them.

1. Take a thin piece of cardboard that is longer than it is wide and bend it into an arch shape.

2. Set it on the table, making sure it still has at least a slight arch.

3. Press on the top of the arch. What happens?

4. Now arch the cardboard again and place it between two stacks of books.

5. Press on the top of the arch again and notice what happens this time.

What Happened:

The stacks of books act as abutments or supports to keep the ends of the arch from collapsing from the weight you put on it. Without them, there was nothing to support the weight of your hand and keep the ends of the arch from pushing outward and falling down.

For another simple project, use sugar cubes to build an arch. Taper the sides of the cubes with an old nail file (or scrape them with a butter knife) so that they fit snugly against each other to form an arch. Be sure to use an odd number of cubes, so that there’s only one cube in the middle. If you used two cubes in the middle, the frictional force between those blocks would be overcome by the load force on the arch, causing it to buckle.

Suspension Bridge Activity

Make a model of a suspension bridge and learn why anchors for the cables are so important!

1. Pick two hardcover books that are the same height and about the same thickness. Stand them up on end, facing each other, several inches apart.

2. Tie a piece of string around the top of one of the books.

3. Letting the string hang loosely between the books, tie the other end to the top of the other book.

4. Now press on the center of the string suspended between the two books. What happens? (The books will fall over.)

5. Untie the string and set the books back upright, about 10″ apart.

6. Place a stack of books on top of one end of the string. Pull the string tight and hang it over the tops of the standing books, with some string hanging loosely between them.

7. Put the other end of the string securely under another stack of books, a few inches away from the standing book.

8. Now try pressing again on the string in the center. What happens this time?

Learn About Bridges

Types of Bridges

Arch bridges were one of the first types of bridge. The Romans used arches in their bridges and aqueducts as well as in their triumphal arches and other great architecture. See a picture of Constantine’s Arch here . Arches are designed with an odd number of stones, with the top, middle one being the keystone on which the bridge’s weight rests. These stones have slanted sides so that they fit tight against each other. The downward force of the bridge’s weight spreads out to the stones on either side of the keystone. Arches used in bridges also have supports at each end of the arch called abutments . These supports keep the stones in the arch in place even when weight is put on top of them.

Suspension bridges use a combination of strong cables and tall, solid towers to achieve a balance of forces. The roadway of a suspension bridge is suspended from the tower and held up by incredibly strong cables. Most suspension bridges today use steel wires and cables, because steel is very strong. A steel wire only 1/10th of an inch thick can hold more than 1,000 pounds of weight without breaking! To make the cables used in bridges, thousands of strong steel wires are twisted and bound together to make them even stronger. The Brooklyn Bridge in New York is one of the most famous bridges, now not so much for its size as its beauty. Built in 1883, it was the first great suspension bridge and a feat of engineering. At the time, it was the longest suspension bridge ever built (though several larger ones have been built since). The stone and steel that Brooklyn Bridge was built with combined to make it both solid and graceful. See a picture of it here .

Learn more about another famous suspension bridge, the Golden Gate Bridge , located in California.

To learn more about different types of bridges, check out this site .

Architects & Engineers

In general, bridges are designed by two different types of people. Architects are responsible for how a bridge looks while engineers are responsible for how the bridge works and is supported. There are a lot of things to consider when designing a bridge. Physics is a field of science that studies matter, energy, forces, and more. People who design bridges need to understand some important physics concepts in order to make a bridge that will be strong, stable, and secure over time.

Some physics concepts that are considered when bridges are designed are compression and tension . These are both forces that happen every day on bridges and can act differently on different materials. Compression presses down or shortens an object. Try putting a marshmallow on the counter and pressing down on it with the palm of your hand. The force from your hand compressed the marshmallow! Tension stretches out or lengthens an object. When you stretch a rubber band, a toy slinky, or pull two ends of a string tight, that’s tension.

In addition to being able to support lots of weight, a bridge must also be able to stand up to lots of different types of weather, like high winds and sometimes even earthquakes!

Sometimes architects and engineers design special bridges that combine two or more types of bridges together to make the best possible bridge for a location. They have to be very careful to make sure the bridge design will still be stable and strong enough. Bridge designs must be tested quite well before a bridge is ever built.

Printable Worksheet & PDF

Use this worksheet to help kids review types of bridges. It also includes two simple activities.

More Physics Projects:

•  Make a Water Wheel
•   Demonstrate Centripetal Force 

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