1. Do Now (8/26/13): Welcome! 1.Find your seat 2.Write your name on the notecard on your desk.

2. Brainstorm: 1.What does the word “charge” make you think of? 2.What is the definition of the word “static”? 3.Describe the parts and structure of an atom.

3. Chapter 20 Static Electricity

4. Intro Syllabus Course outline BPI webpage Vocab

5. Electrostatics The study of charges that can be collected and held in one place

6. With your “elbow partner” come up with examples where charge differences build up in nature, and describe the consequences

7. Charge Caused by an electron imbalance as electrons move

8. Atomic Charge In neutral atoms the number of electrons = the number of protons

9. Charge Opposite charges attract & like charges repel

10. Charge Conservation electric charge can neither be created nor destroyed.

11. Charge The charge of an object leaks off into water molecules in air

12. Charge Charged objects eventually return to their neutral state

13. Charge Holding a charge is easy on dry days & difficult on humid days

14. Conductors Materials like metals that allow electrons or charges to move

15. Common Conductors Copper, silver, gold, aluminum, & graphite

16. Insulators Materials that will not allow electrons or charges to move easily

17. Common Insulators Glass, dry wood, plastic, rubber, & dry air

18. Electron Sink Anything that can absorb lots of electrons

19. Common Electron Sinks People, Earth, etc

20. Electroscope A device used to detect electrical charge

21. Charge Redistribution Conduction Induction

22. Charge by Conduction Charge by touching a charged body to a neutral body

23. Charge by Induction Charge by moving a charged body near a neutral body

24. Charge Separation on Neutral Objects - - - + - - - + - - - + - + - + - + + + - + + + - + + +

25. Do Now (8/27/13): Complete the pre-lab

26. Do Now (8/28/13): Complete the Drill sheet

27. Electrical Force Force caused by the attraction or repulsion of charges

28. Electrical Force Electrical force must be much greater than gravitational force

29. Coulomb’s Law Force between charges is proportional to charge & inversely proportional to distance between charges

30. Coulomb’s Law F  q A q B

31. Coulomb’s Law F  1d21d2

32. Coulomb’s Law F  q A q B d 2

33. F e Formula F e = K q A q B d AB 2

34. Electric Constant K = 9.0 x 10 9 Nm 2 C 2

35. Identify another formula that is very similar to the electrical force formula

36. Gravity Formula F g = G m A m B d AB 2

37. The magnitude of the force is inversely proportional to the square of the distance

38. Calculate the electrical force occurring when a ball with a charge of 2.0 x 10 -8 C is 12 mm from another ball with a charge of -3.0 x 10 -8 C:

39. Calculate the electrical force occurring when a ball with a charge of 3.0 x 10 -4 C is 12 mm from another ball with a charge of -6.0 x 10 -6 C:

40. Millikens Oil Droplet Experiment

41. Electron Charge 1.60 x 10 -19 C C = Coulombs

42. Calculate the force between 2 electrons 8.0 x 10 -3 nm apart:

43. Calculate the force between the electron & the nucleus of hydrogen: 4.0 x 10 -2 nm apart:

44. Do Now (8/29/13): Complete the Drill sheet

45. Do Now (8/30/13): Complete the Drill sheet

46. A BC d AB = 4.0 mm d BC = 3.0 mm q A = - 4.0 x 10 -5 C q B = 3.0 x 10 -5 C q C = 9.0 x 10 -5 C Calculate: F e on B

47. A BC d AB = 4.0 mm d BC = 3.0 mm q A = - 4.0 x 10 -5 C q B = 3.0 x 10 -5 C q C = 9.0 x 10 -5 C Calculate: F e on A

48. A BC d AB = 4.0 cm d BC = 3.0 cm q A = 3.0 x 10 -5 C q B = 3.0 x 10 -5 C q C = 6.0 x 10 -5 C Calculate: F e on C

49. Calculate the force between 2 particles 1.2 x 10 -3  m apart: q 1 = 4.0 x 10 -5 C q 2 = - 4.0 x 10 -5 C