40 Easy Science Experiments Using LEGO®

If you read Science Sparks often, you’ll know how much we love LEGO®. The play, learning and creative opportunities are endless, so today we’re sharing 40 of our favourite LEGO® science experiments and STEM challenges.

LEGO® is the most amazing, versatile resource that opens the door to endless creative learning opportunities for kids of all ages.

Science Activities using LEGO®

Model the seasons with LEGO®

Model the seasons with LEGO® trees. We used icicles for winter. Red and yellow leaves for autumn, and spring flowers and hedgehogs for spring.

This was a wonderfully visual way to show how the seasons change, and my children had a great time searching through our LEGO® stash for suitable bricks.

Art and Science Ideas

LEGO® Printing and Painting

Learn about patterns and shapes using LEGO® bricks to print. This is a brilliant outdoor science activity and can be done individually or with lots of children contributing to a larger piece of artwork.

Get creative with Toddler Approved’s LEGO car painting idea on a ramp. Ramps are great for learning about forces, momentum and friction, too!

Draw Shadows

Use LEGO® to make shadows and then draw a picture with chalk incorporating the shadow.

This activity kept my kids entertained for hours last summer and it was fun to watch how the shadows and then the picture changed during the day.

Sorting and filtering

Learning about filtering and sorting with a homemade LEGO® Filter. Our filter was very basic, but you could make something more impressive with more time and thought.

Set up an icy rescue

LEGO® bricks and figures are great for freezing in water for ice excavation activities.

Children can use warm and cold water to melt the ice and salt for an extra challenge!

Small syringes and droppers are useful for dropping water onto the ice and help with number recognition and hand strength.

Fun-A-Day has a great activity where children rescue Hans Solo from frozen baking soda.

Parachute and air resistance

Learn about forces and air resistance by making a parachutes for a LEGO figure.

Ideas for a parachute science investigation:

• Use the same parachute but different numbers of minifigures.
• Use the same size parachute but different materials.
• Use different size parachutes.

Balloon Powered Car

Another way to learn about forces and Newton’s Laws of Motion is to build a balloon-powered car from LEGO®.

Build a Bridge STEM Challenge

Make a LEGO/DUPLO bridge. This is a fun activity for learning about stable structures and a great team-building activity. We used folded paper for the top of the bridge, but you could use lolly sticks or more LEGO® instead.

Hidden Minifigures

Find out how fast different paper types absorb water to reveal a hidden LEGO man.

Waterproof Roof STEM Challenge

Investigate how waterproof different materials are by using them as a roof and spraying them with water.

Rubber band powered car

Make a rubber band powered car like Frugal Fun for Boys.

Plant Growth Model

Use LEGO® to model the growth of a plant. This is a lovely visual way to encourage children to think about what’s going under the part of the plant they can see.

Make a small brick float

Discover whether a small building brick floats on oil or water. This is a fantastic way to learn about density of liquids and what that means.

Ramps, Cars and Friction

Use LEGO®/DUPLO® to make a ramp and explore how different gradients affect the speed of cars.

LEGO® STEM Challenges

Design a LEGO® maze. For an extra challenge, a magnetic maze or 3D maze is a fantastic extension challenge.

Sink or Float

A sink-or-float activity is great for little ones. For an extra challenge, find out how much weight you can add to a Lego or paper boat before it sinks.

More Learning deas using LEGO®

We love these LEGO themed spelling games from Home Literacy Blueprint.

Make words with LEGO like Playdough to Plato.

Practice spelling with LEGO letters like This Reading Mama.

Number themed LEGO ideas

Have fun learning to count and measure using DUPLO in this great post from The Imagination Tree

Make a Numeracy at Home box and add some LEGO bricks for counting, comparing sizes, etc.

Learn about bar charts using some sweets and DUPLO®. You could make a smaller version of this with LEGO® too.

Make a LEGO® or DUPLO® metre ruler.

Discover how many LEGO bricks tall you are!

If you want to get the kids moving around, this count and move game from JDaniel4’s Mom looks like lots of fun.

We love this super simple way to learn with LEGO and a marker from Suzy Homeschooler.

Or how about these fun Math challenges from Buggy and Buddy?

For little ones, try a  colour and shape sorting activity like Adventure in a Box.

Or how about a LEGO catapult like this cool one from Frugal Fun for Boys

Make your own LEGO Games

Make a LEGO rugby pitch.

This portable LEGO kit from Mama.Papa.Bubba is a fantastic idea for travelling with little ones.

DUPLO® Learning Activity Ideas

If you’ve got younger children, take a look at my DUPLO activity ideas, including printing with DUPLO, slimy DUPLO sensory play and DUPLO games.

Do you have any more LEGO® experiment ideas for us?

Last Updated on February 24, 2025 by Emma Vanstone