Two ping-pong balls, hanging on separate strings, are each rubbed with the same piece of fur and are shown to repel and move apart. Next a hanging ping-pong ball is rubbed with a piece of fur and is shown to be repelled by a rubber rod which has been rubbed with the same piece of fur. Then a glass rod, rubbed with silk, is shown to attract the same ping-pong ball. Finally the fur is shown to attract the same ping-pong ball.

Equipment:
- Ping-pong balls suspended on strings attached to support rods
- Fur and silk pads
- Rubber rod and glass rod

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This video is part of the project "Videos of Physics Demonstrations", which is created by Dr. Galli and Dr. Amiri of Physics Department, Weber State University. To access the full library of the videos, please visit this link: https://www.weber.edu/physics/amiri_galli.html

Links to University and Department:
Weber State University Homepage: https://www.weber.edu/
WSU Physics Department: https://www.weber.edu/physics