Balloon Rocket String
A balloon taped to a straw zooms along a length of string, powered by nothing but escaping air.
Movement
4–9 years
15–30 min
Active
Low mess
At homeNearby
What you need
- A long balloon
- A straw
- String (3-5 metres)
- Tape
Setup
- Thread the string through the straw and stretch it tight between two fixed points
- Blow up the balloon without tying it and pinch it shut, then tape it to the straw
- Let go and watch the balloon rocket along the string
Play prompts
- Which direction does the air push the balloon?
- Does a bigger balloon go faster or slower than a smaller one?
- Can two balloon rockets race on side-by-side strings?
Ways to change it up
- Angle the string on a slope to test if it changes the speed
- Try different balloon shapes and compare distances
Safety notes
- Popped balloon pieces are a choking hazard, clear them away promptly
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