CH 5 – Electricity and Magnetism Static Electricity CH 5 – Electricity and Magnetism

Van de Graaff Generator

PhET Sim https://phet.colorado.edu/en/simulation/balloons-and- static-electricity Bill https://www.youtube.com/watch?v=oU8Fe6846d4

Triboelectric Effect Greeks + Other Mediteranean Amber + Fur = Attracts Feathers  New Latin word electricus ("of amber" or "like amber", from ἤλεκτρον, elektron, the Greek word for "amber") t

Static Electricity Def: Related to electrical charges at rest, within or on the surface of a material. These can be the result of a temporary movement of electrons from one substance to another Generally, substances are found in a neutral state (same # of + and -). When electrons move from one substance to another the materials become charged. We will discuss dynamic electricity later in the term https://phet.colorado.edu/en/simulation/balloons-and- static-electricity

Charging Objects Balloon

Rules There is a positive (+) and a negative (-) charge Only electrons (e-) can move If a substance has more protons, it is positively charged. If it has more electrons, it is negatively charged. To become neutral again, a substance will lose or gain electrons

Rules Alike charges repel, opposites attract Friction (rubbing) causes the electrons to be passed on Touching passes on the charge A charged substance can attract a neutral substance because the protons will align with the electrons

P. 148 table 5.18 is a good summary of the methods of charging

Electrostatic Series Triboelectric series Gives a hierarchy of substances and their ability to lose and gain electrons. An object above another object will gain electrons from the ones below it. Must memorize: (eh not really. Sorta) plastic will always gain electrons and be negatively charged. Glass will always lose electrons and become positively charged.

Example Plastic Gold Wood Cotton Paper Glass   Rub: plastic and wood rub: gold and paper 1- What happens if plastic and paper come close? 2- Gold and plastic? 3- Wood and paper?