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Pick up the two bottom strips by the tabs, allowing both strips to hang down. Slowly bring these toward each other.
- e) Record your observations.
- f) Was the force attractive or repulsive? Explain.
4. Charge up a rubber rod by vigorously rubbing it with a piece of wool. Use lots of friction to get the rubber rod charged up. Touch the rod to a small Styrofoam® ball coated with a conducting paint. Observe the interaction of the rod and the ball.
- a) In your Active Physics log describe the interaction you observe.
5. Charge up a glass rod by rubbing it with a piece of silk. Bring it toward the charged ball but try not to let them touch. Observe the interaction of the glass rod and the ball.
- a) In your Active Physics log describe the interaction you observe.
6. Assume that the rubber rod gained electrons (negative charges) and became negatively charged when rubbed with the wool.
- a) What do you think could have happened to some of the excess electrons on the rubber rod when it touched the Styrofoam ball? Use your observations to justify your answer.
- b) If the rubber rod got the excess electrons from the wool, what would be the wool's charge?
- c) Explain how you could check to see if your answer to (b) is correct.
7. Assume that the glass rod transferred some electrons to the silk.
- a) What would be the charge of the glass rod? Use your observations to justify your answer.
- b) If the silk gained electrons, what would be the silk's charge?
- c) Explain how you could verify your answer to (b).
8. Get rid of any excess electrons on the Styrofoam ball by touching it. (This is made more effective if you moisten your finger. The slight moisture helps remove the charge.)
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