This should work. Inflate a balloon, attach it to a straw with a tethered string running through it, and when you let the air go out of the balloon, the "rocket" should be propelled along the string. But despite various different rocket "designs," we haven't been able to get this to work. We've tried taping a big balloon directly to the straw with packing tape (the balloon may move a little along the rope but not very far - and re-inflating the balloon tends to make it pop because of the tape stuck to it), attaching a paper towel tube to the straw and sticking a long thin balloon into it (the rocket doesn't move at all), and taping a long skinny balloon to the bottom of the paper towel tube (again, basically no movement). Maybe it's not enough force, maybe the pressure is not being well directed. All I know is we can't seem to get this experiment to work. How frustrating!
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