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2 balloons
1 clothes pin 1 straw |
8 feet of string
1 scissors 2 pieces of tape |
2. Stick the short piece of straw part way into the neck of one of the balloons. Tape the neck tightly around the straw.
3. Thread the longer piece of straw onto the string. If it will not go through, you can suck it out.
4. Tie the ends of the string between two chairs or desks so that the string is tight. Put the straw at one end of the string.
5. Blow up the plain balloon so that it is about the size of your face. Twist the end and clip it shut with the clothes pin.
6. Tape the balloon under the straw on the string. Which way do you think the neck should point if we want the balloon to travel along the string?
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7. Take the clothes pin off and let the air out of the balloon. What happens? How far does the balloon go?
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8. Predict: What do you think would happen if the balloon had more air in it?
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9. Try it and record what happens.
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10. Predict: What do you think would happen if the balloon had less air in it?
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11. Try it and record what happens.
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12. Now blow up both balloons so they are the same size, about the size of your face. When both are ready, let the air out so that it blows on you. Which balloon has more air coming out?
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13. Predict: What do you think will happen if you repeat steps 5-7 using the balloon with the straw? Look back at your notes to remind yourself what happened with the plain balloon.
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14. Try it and record what happens.
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How can you explain what happened when you the two different balloons?
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