Purpose
In this investigation, students will explore the nature of a force. Students will determine whether or not the force is distinct from other known forces.
Discussion
This is an introduction to electrostatic force. It shows students evidence of a force but demands they eliminate gravitational force and magnetic force before giving it a new name. Pith ball electroscopes may be used; or just hang a pith ball on a thread from a convenient support.
Required Equipment
Pith ball suspended from a support rod, vinyl and acetate strips or tubes, wool and silk cloth swatches (2" x 2"), brick (or a heavy book), bar magnet
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Student Worksheet Teacher Notes
