09 elec 02
- 1. Friction and the Electrostatic Series The simplest way to charge a neutral object is by friction. 1
- 2. Friction and the Electrostatic Series Charging by friction is the transfer of e- between 2 neutral objects that occurs when they are rubbed together or touch. Neutral Cotton Neutral Ebonite +-+-+ -+-+-
- 3. Friction and the Electrostatic Series When rubbed together, different materials lose or gain e- more easily than others. 3
- 4. Friction and the Electrostatic Series The Electrostatic Series ranks different materials on their ability to gain or lose electrons. Tendency to gain Material Relative Charge electrons platinum, gold most likely Negative rubber ebonite carbon, copper, nickel polyethylene (plastic) cotton silk nylon fur or hair wool Glass least likely Positive + 4 Acetate
- 5. Friction and the Electrostatic Series Neutral Cotton Neutral Ebonite +-+-+ -+-+- What will happen when these are rubbed together? 5
- 6. Friction and the Electrostatic Series Neutral Cotton Rub Rub Rub +-+-+ Neutral Ebonite -+-+- Rub e-move from cotton into Rub ebonite. Rub
- 7. Friction and the Electrostatic Series Results: Positively Charged Cotton Negatively Charged Ebonite +++ -+-+ * The number of + and – are conserved. 7
- 8. Friction and the Electrostatic Series Note: the + and signs do not represent the actual number of positive and negative charges (protons or electrons). They represent a collection of charges (protons or electrons). 8