Swinging Girl

Brick Egg

How strong is an eggshell? Eggs seem pretty fragile. Drop one and breaks pretty easily, however, an eggshell is quite strong, but how strong? Try this activity and find out!  

Try this activity!

Watch this video and then try it at home!

Here's what you need

  • 8 raw eggs

  • 1 cinder block (or something heavy)

  • 16 plastic bottle caps

Here's what to do    

1.  Evenly space 8 bottle caps, upside down, so they will be covered by the cinder block.

2.  Place an egg upright in each bottle cap and top with another cap.

3.  Gently and evenly lower the cinder block down on top of the eggs.

4.  Celebrate!

Questions to ask

Do you think these eggs can support the weight of a cinder block?
Why is it important to put the caps on the top and bottom of each egg? What happens if you take them away?
How many eggs can take away and still hold up this cinder block?

Brick Egg

What's going on?

Eggshells are fragile enough for a chick’s beak to break through. You might expect that the weight of a brick would crush an egg – and you would be right! The key to making this experiment work is weight distribution. If all the brick’s weight were to rest on one point on the egg, it would crack. The bottle caps help by distributing the weight evenly around the eggshell - meaning there is less force pressing down on each point. This is the same way that snowshoes help you walk on top of snow!

Try This

Use science vocabulary: Use related science words such as weight, force, gravity and distribution as you talk and play together. Children learn new vocabulary words when they hear grown-ups use them in context.

Extend your experiments: Design, build and test a device that will distribute the weight of the brick around the egg without using the bottle caps. Try using paper, cardboard and other recycled materials!

Keep In Mind 

  • Children are natural scientists; let them lead the way in their experimentation! Encourage them to ask questions and make suggestions only when they are stuck/discouraged.

  • The order suggested is not the only right or perfect way. Make adjustments based on the age, ability, and interests of the children.  

Additional Resources

Little Engineers by Haig Norian
What Do You Do with an Idea? By Kobi Yamada


Stay At Home Science

If you like this Stay at Home Science experiment, check out similar activities!