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What to Do
one end of the string through the drinking straw.
it to something stable, like a curtain rod or a heavy piece of furniture.
Be careful that no one trips over the string.
someone inflate a balloon and hold the air inside without tying it.
someone holds the other end of the string taut, attach the balloon
to the straw with the masking tape.
the air from the balloon.
and record the distance it moves.
What's Going On This
simple activity demonstrates how rockets work. They carry containers
filled with substances that, when ignited, produce gases. These
gases escape through vents in the rear of the rocket. The gases
going backward drive the rocket forward. This force demonstrates
the principle of reaction. You can also try this experiment outdoors
using a much longer piece of string.