I've got another easy EGG themed STEM Challenge for you today! It's a bit of a twist on the traditional egg drop experiment.
The challenge is to build a car using K'Nex or another construction toy to save an egg passenger. This is a brilliant egg experiment, that's great for any time of year, but especially Easter! It can be used to learn about momentum, speed and friction or just a fun hands-on activity.
Egg STEM Challenge
Design and build a car using only K'Nex with safety features that will protect an egg from breaking if it crashes into a solid object.
Materials
Egg - boiled is less messy
K'Nex/LEGO/other construction materials
Elastic bands
Cotton Wool
Bubble Wrap
Test track area
Instructions for Crash Test Eggs
Design a car to hold the egg so it doesn't crack on impact with a solid object.
Think about how to protect the egg.
- Build a protective cage.
- Add protective materials: bubble wrap, cotton wool, etc
- Try an air bag - balloon
- Could you add some suspension?
Can you think of anything else? Would changing the type and size of wheel help?
My children came up with the design above, which worked really well. The egg is set nicely back into the car so the front absorbs most of the impact. The egg is also held tightly in place, meaning it doesn't move very much.
FREE Crash Test Eggs Worksheet
Print my FREE instructions and worksheet to help guide children through the activity.
Crash Test Eggs Extension Ideas
Try a different method of protecting the eggs and design a test to investigate which method works best.
Does your solution still work if you release the car down a ramp?
How can you make your comparisons a fair test?
More Egg STEM Challenges
If you enjoyed this activity, we've got lots more fun Easter STEM Challenges to try.
I've also got lots of brilliant egg experiments too!
Last Updated on March 24, 2026 by Emma Vanstone
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