Bell Work: Welcome Back ** Choose a new seat next to someone new in a new part of the room. What was the best part of your break that included a change in momentum? In what direction did you travel during the break? Where did you go? When were you travelling with the greatest speed? What was the best use of electricity during your break?

Electrostatics Chapter 18

Electrostatics the study of static electricity – charge that is held in one place

Electric charges: Positive: more protons (p+) than electrons Negative: excess electrons (e-) Neutral: equal # of p+ and e-

matter usually neutral or uncharged through friction, electrons can be transferred and a static charge created total # of e- and p+ stays the same

Ex: rub balloon on hair  electrons move from hair (+) to balloon (-), socks on carpet

like charges repel, different charges attract any neutral object will be attracted to a charge

charge can be discharged (neutralized) by touching something that is grounded – connected to the earth

Conductors Insulators Cannot hold a static charge Hold a static charge well e- can flow through e- cannot flow through usually metals or semimetals usually nonmetals silver, copper, gold, aluminum, silicon plastic, glass, wool, air