Egg Drop Challenge: How to Design a Protector That Actually Works
By Ahmed, founder
The egg drop challenge looks like a craft project, but it’s an engineering problem. The goal: build something that stops an egg falling from a height without cracking it. The trick isn’t padding more. It’s understanding what makes an egg break.
Why eggs break
An egg breaks when the force on its shell gets too big. A falling egg is moving quickly, and that motion has to be taken away when it hits the ground. How much force that takes depends on how quickly the stop happens.
- A sudden stop, like landing on concrete, packs the change into a tiny fraction of a second, so the force is large.
- A slower stop, like landing on a pillow, spreads the same change over more time, so the force is smaller.
That is the single most important idea in the challenge: a soft, slow stop saves the egg. Everything you build should make the stop take longer.
Two ways to slow the stop
1. Slow the fall (parachute). A plastic-bag parachute catches air and lowers the speed at which the egg arrives. A lighter, wider parachute is better, as long as it opens reliably.
2. Stretch out the landing (cushion). Soft, squishy materials squash as the egg lands, spreading the stop over a longer distance and time. Good choices include cotton balls, bubble wrap, sponge, crumpled paper and straws.
You can combine both.
Design tips
- Spread the force. A flat base spreads force more widely than a point.
- Don’t wrap too tightly. A snug, rigid box can transmit the shock to the egg. The egg should be held, but surrounded by something that gives.
- Straws make a good frame. A tripod of straws bends and crumples, absorbing energy.
- Keep it light. A heavy design hits harder.
- Test the landing, not just the look. Use a budget so there’s a real trade-off: each material has a cost, and the team pays for what they use.
Test it like an engineer
- Start low. Drop from knee height first. If it works, go to waist height, then higher. You learn more from a design that survives low drops than one that fails at the top.
- Use hard-boiled eggs for early tests, then raw ones for the real drop. Do raw-egg drops outdoors, over a tray or a plastic sheet.
- Change one thing at a time. If it fails, change one feature and test again. That’s how you know what mattered.
- Write down what happened. Drop height, design, result, what you’d change.
What to say when it breaks
Breaking is information. Ask: Where did it crack? Which side landed first? Was the egg loose or jammed? Then redesign. Real engineers iterate. A first failure is the start of the process.
The science words (for older kids)
Stopping an object takes a force acting over a time. Longer time means smaller force for the same change in motion. This idea is behind car crumple zones, airbags and bike helmets, and it’s what our grade 8 lesson Can you design a crumple zone? explores with a crash cart. See also why crumple zones save lives.
Get the full guide
Our family lesson Can you drop an egg without breaking it? has a materials budget, testing steps and the science explained for parents. It is part of Build It, Launch It, along with a paper plane test and a balloon rocket. Sign up for three lessons free, or see the parents page.
Washing up: raw egg can carry bacteria. Wash hands and surfaces after the drop.