Electrostatic Roller Ball 5B30.00
Glass roller ball and track located in Electrostatics Cabinet, A2.
Van de Graaff generator located in Electrostatics Cabinet, B3.
Connect Van de Graaff generator to roller ball track.
Inject a drop of water into glass roller ball through small hole in roller ball.
Place roller ball on track.
Turn on Van de Graaff. Ball should start rolling around track. Water droplet in roller ball is acted upon by forces analogous to the forces acting on the "hailstones" in the Volta's Hailstorm demonstration.
Use grounding stick to ground Van de Graaff prior to switching it off. The spark from our Van de Graaff will get your attention but should not cause injury.