What you will need
PHOTO: CATHERINE THOMAS, TAIPEI TIMES
A balloon (a long skinny one or shiny one works best)
A clothes peg
An old cereal box (or some thin cardboard/stiff paper)
A paper or plastic cup
A long piece of fishing line (Be very careful with this as it is very hard to see once hung up. Smooth string will also work fine.)
Some small items to use as cargo
A stopwatch or a watch with a second hand (optional)
*Blow up the balloon to check how big it is. Secure the mouth with the clothes peg.
*Using the cereal box, tape and straw, build a small container to carry your cargo. Think about the size of your balloon and cargo. NOTE: The straw will have the fishing line threaded through it to create the track for your rocket, so include it in a way that allows this!
*Thread the fishing line through the straw.
*Attach the container to the balloon using the tape. Don't use much tape on the balloon.
*Take one end of the fishing line and tape it to the wall at around chest height (be careful, the tape might remove paint from walls.)
*You can either attach the other end of the line to something or hold it. NEVER leave fishing wire up when you are not there. It can cause accidents.
*Put your cargo in the container. Unclip the clothes peg and watch your rocket go. If you have problems check the Further Ideas box.
1. rocket n.
2. Newton n.
3. construct v.t.
4. cargo n.
5. secure v.t.
使牢固（shi3 lao2 gu4）
6. container n.
7. thread v.i./v.t.
8. compress v.t.
9. particle n.
10. reaction n.
The air in the balloon is compressed. Air particles don't like to be squeezed together in a small space, so when they have the chance to escape into a larger, less-crowded space they do so very quickly. This causes the ballon to shoot off. Newton's third law is “for every action there is an equal and opposite reaction.” So the action of the air escaping out of the ballon makes the reaction — the balloon and cargo being pushed forward — happen.
What powers a real rocket? How do you think you can power your rocket without using any gas or electricity? How much weight do you think your rocket might be able to carry? How do you expect the rocket to behave if it is carrying something heavy? Something light? Why do you think that you need to use fishing wire or smooth string for this experiment? Do you think that changing the shape or the size of the balloon will change the way the rocket acts?
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