When the plastic ruler is rubbed against the wool, electrons are transferred from the wool to the plastic, causing the ruler to become negatively charged (static charge). When this negatively charged object is brought near the electrically neutral paper, it repels the electrons on the surface of the paper, creating a positive charge on the side closest to the ruler. This phenomenon is known as . The electrostatic attraction between the negative ruler and the positive side of the paper creates a force sufficient to make the paper spin. 5. Extension Activities and Variations

Conduct the experiment in a dry room, as moisture in the air causes the static charge to dissipate more quickly. To make this paper even more detailed, I can:

Fold the paper square diagonally in both directions, then unfold it, creating a small, raised center point.