Balloon Rocket

A balloon taped to a straw zooms along a string across the room – like a real rocket.

Time: 20 min
Age: 4–12 years
Energy: Medium
Where: At home · Outdoors

Air rushing out of the balloon pushes it the other way – the same principle that makes rockets fly (Newton’s third law). Best of all, you can repeat it and improve it forever.

The steps are in the app

Step-by-step instructions, tips and an easier and a harder version are waiting in the Hopsa app – along with 300 more ideas matched to your kids’ ages.

Join the waitlist

Coming soon to the App Store and Google Play

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