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Science · The activity desk
Air-powered line rocket
Watch escaping air send a balloon along a short line, then compare two launches.
Let's play →
A little plan for play
Open interactive activity →Add to play journal →What you need
A balloon, balloon pump, drinking straw, string, tape and two stable supports
Age: 9–12 years; choose for the individual child.
Set up: For ages 9–12 with an adult. Adult threads the string through a straw and ties it taut between stable supports in a clear space, away from faces and walkways.
Adult's role: Handle the balloon and string throughout. Keep younger children away and remove the line and balloon immediately after the experiment.
Let's make it happen
- Predict which way the balloon will travel when air escapes. Stand clear of the line.
- Adult uses a pump to inflate the balloon, pinches its neck closed, and tapes its side to the straw with the neck pointing along the line.
- Adult releases the neck. Watch the straw slide as air escapes in the opposite direction. Repeat with less air and compare the journeys.
Make it simpler: Watch one launch and point in the direction the rocket travels.
Clean up: Adult unties and puts away the string and straw, and disposes of the balloon and any pieces immediately.
Uninflated or broken balloons can cause choking. Adult handles balloons, watches for breakage and keeps all pieces away from children; avoid latex if anyone is allergic.