1. Electrostatics Physics

2. A. Definition  The study of electrical charge that can be collected and held in one place

3. B. Examples of Static Charge  Socks in a dryer  Sliding feet on carpet  Rubbing a balloon

4. C. Electric states of Matter  Neutral: negative charge = positive charge  Negatively charged: excess of electrons (e - )  Positively charged: deficiency of e -

5. Special Note  e - is responsible for understanding electrical phenomena

6. D. Rules of Charge  Like charges repel  Opposite charges attract  Charge is conserved

7. Classes of Matter A. Conductors CrystalLattice: e - flow freely

8. Conductor 2. Description  material that readily transfers charge  e - are free to move around in the crystal lattice (sea of e - )

9. Conductor  3. Examples:  Metals  Water  Earth (best)  Electric pickleStruck by lightning Roy Sullivan Electric pickleStruck by lightningRoy Sullivan Electric pickleStruck by lightningRoy Sullivan

10. B. Insulators  1. Description: e - are tightly bound to nuclei and will not readily transfer  2. Examples: plastic, wood, glass, rubber, paper

11. Semi-Conductors  1. e - can move more freely than in an insulator, but not as easily as conductors  2. Examples: Silicon, Germanium

12. III. A. Induction  1. How is it done?: Bring a charged object near another uncharged object (no contact)  2. What occurs?: e - are either attracted or repelled from the charged object

13. 3. Diagram video simulation video simulation that includes how lightning works and grounding

14. Induction 4. Resulting Charge  Resulting Charge:  Opposite of charging object (temporary)  Overall charge is still neutral

15. B. Conduction  1. How? Touch charged object to another object  2. What occurs? e - are transferred

16. Conduction

17. Conduction  4. Resulting Charge: same charge as charging object and charge is permanent

18. Grounding  Process of removing excess charge from an object by transfer of e - to a larger object  Ex.: middle prong on wall outlet

19. Mike is investigating the charge on several objects and makes the following observations: C attracts B, D repels C, E attracts D and repels F, F attracts A; If A is negatively charged and B is neutral, what can Michael conclude about the charge of C, D, E, and F? F is positive, E is positive, D is negative, and C is negative

20. Two neutral conducting pop cans are touching each other. A negatively charged balloon is brought near Can X as shown below. As the balloon approaches Can X, there is a movement of electrons between the balloon and can X. a.TRUE b.FALSE

21.  A metal sphere is electrically neutral. It is touched by a positively charged metal rod. As a result, the metal sphere becomes charged positively. Which of the following occur during the process? List all that apply. a. The metal sphere gains some protons. b. Electrons are transferred from the sphere to the rod. c. The metal sphere loses electrons. d. The overall charge of the system is conserved. e. Protons are transferred from the rod to the sphere. f. Positive electrons are moved between the two objects.

22. Review  List and describe the 3 electrical states of matter  Explain the process of induction  Explain the process of conduction  What happens during grounding?