Lab experiment: Separation of salt and pepper

Both the salt and pepper granules are positively charged. Theplastic fork, which has gained electrons from the rubbing of thecloth, attracts positive charges in the mixture. The pepper, whichis lighter than the salt will jump up to the fork and stick to itmore easily than the salt. If salt granules were to jump to thefork, they would more likely fall down due to their weight. This iscalled static electricity because the energy is now flowing. Thisstatic electricity is caused by friction, more specifically therubbing of the plastic fork with the cloth.

The objects that you use (pepper, salt, plastic folk,cloth) are they insulators orconductors

Based on the tribo-electric series shown below whichobject in your experiment became positively charged and whichbecame negatively charged?

Triboelectric Series (Insulators Only) Negative polyvinylchloride plastic polyester hard rubber cotton paper silk fur wool nylon your hair glass your hand Positive