Magic Balloons, Dancing Paper Dolls And Curling Water |
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Problem: |
Can electricity be made to do work? |
Research: |
In your science textbook, read about static electricity and about work. |
Materials: |
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1 balloon
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a sweater
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plastic wrap
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four large books
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plastic comb
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a steady stream of water
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a head of hair
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Procedure: |
1. Blow up the balloon and tie it closed. Rub the balloon on the sweater several times. Place the part of the balloon that you rubbed against the wall. Let the balloon go and in your notes, describe what happens.
2. Turn on the faucet on very low until a steady, thin stream of water comes out. Put the comb close to the water, but do not touch the water. Describe what happens as you pull the comb away from the water. Draw a picture.
3. Draw a small human body shape on very light paper to make two dancing dolls. Cut out the dolls and decorate them. Set up the books in two stacks with two books in each stack. Leave about 25 cm between the two stacks. Cut a piece of clear plastic wrap long enough to wrap around the top book in each stack. Place the two dancers under the wrap. Rub a woolen cloth back and forth on the stretched wrap. Slowly raise the wrap and the two books. Describe what happens to the two dancers. |
Data: |
Make a data table to record your observations and inferences for each step. |
Conclusion: |
You must explain what you learned by doing this activity. Remember that you must answer the question you asked in your original problem statement. |