1. Table of Contents 13 Day 13 Feb 21 Tues 14 Day 14 Feb 23 Thurs
60 Day 16 Mar 1 Thurs
83 Day 17 Mar 13 Tues
Day 18 Jan 26 Thurs
Day 19 Jan 31 Tues
Day 20 Feb 2 Thurs
Day 21 Feb 7 Tues
Day 22 Feb 9 Thurs
Day 23 Feb 14 Tues
Day 24 Feb 16 Thurs 1 1

2. ELECTROSTATICS at BW page 125
Created for B-W Physics by
Dick Heckathorn
15 February 2K + 12

3. Table of Contents A Investigating Charge B. Investigating Charge
C. Investigating Charge
D. Building an Electroscope
E What is the sign of the charge on the tapes?
F. Electrostatic Series 1A3F p 31
G. Charging by Contact (Conduction)
H Demo: Charging by Induction
I. Induced Charge Separation
J. Demo: Ripping off Charges
K. Demo: Burning Off Charges
L. Concept Development 32.2
M. Electrophorus

4. Table of Contents N. Demo: Electrostatic Attraction
O. Demo: Electrostatic Attraction
P. Demo: Electrostatic Attraction
Q. Demo: Petri Dishes
R. Electrical Units
S. Van de Graaff Generator
T. Demo: Graphite Sphere
U. Demo: Franklin Alert
V. Demo: Glowing Ne2
W. Demo: Fluorescent tube
X. Demo: Charge a Person
Y. Demo: Christmas Tinsel
Z. Demo: Precipitator

5. Table of Contents AA. Demo: Propane Lighter Flame
AB. Demo: Aluminum Pie Pans
AC. Kelvin Water Drop Generator
AD. Construct Lyden Jar
AE. Demo: Dissectible Lyden Jar
AF. Demo: Ice Pail
AG. Demo: Plastic Peanuts in:
AH. How safe is an automobile? airplane?
AI. Why do some homes and barns have lightning rods?
AJ. Demo: Cloud Discharge
AK. Static Electricity at Gas Pump

7. Static Electricity Web Site Comments

8. Bef Aft Ch RC Bef Aft Ch RC

9. A. Investigating Charge
Need 2 4-inch (or so) pieces of
Scotch magic tape
1. Tear off 2 pieces of 4 to 5-inch strips of scotch tape, fold a ½ inch piece over one end of each piece and stick it to the top of a table.
Label one piece ‘A’ and the other ‘B’.

10. A. Investigating Charge
3. Holding the tab, pull both off the table.
4. Bring them near each other.
5. What do you observe? repel
6. Repeat a few times.
7. What do you find when you bring one of your pieces of tape near someone else’s piece of tape? repel

11. A. Investigating Charge
8. How does the kind of charge on A compare to the kind of charge on B?
The are like charges.
9. Why?
Like charges repel 13 13

12. B. Investigating Charge
Label a third piece of tape ‘C’ and a fourth ‘D’
Place tape C on the table. Then place tape D on top of Tape C.
Pull both pieces of tape off the table together.
4. Separate the pieces of tape.

13. B. Investigating Charge
Bring them near each other.
What do you observe? attracted
Record how the kind of charge on C compares to the kind of charge on D?
They are unlike charges
Unlike charges attract each other

14. B. Investigating Charge
8. Compare and record how tape ‘C’ and ‘D’ reacts to tape ‘A’ and ‘B’.
Record how do the charges on each tape compare to the charge on the others.
charge on C is like charge on A, B
charge on D is unlike charge on A, B, & C 17 17

15. C. Investigating Charge
We did: review
Attracted paper with different charged tape
We observed:
Both charged tapes attracted the tape
Conclusion:

16. C. Investigating Charge
Place pieces of paper on the table.
Bring tape ‘C’ and tape ‘D’ near the pieces of paper.
Record what happened
Both tapes attract the pieces of paper
4. What do you think the sign of the charge on the pieces of paper?

17. E. Building an Electroscope 1E1 p 39 1F1 p 33
foam cup, straw, scotch tape
1. Construct an electroscope shown in the picture.
2. Hang a piece of negative tape to it.
3. Bring pieces of charged tape ‘C’ and ‘D’ near the hanging charged tape. 4

18. 4. Record what you observed.
5. Rub the white rod with wool and bring it near the charged tape on the electroscope. What happened to the tape?
It is repelled
6. What is the charge on the white rod? negative

20. D. What is the Sign of the Charge on the Tapes? review
We did:
Found Ben Franklin charge definition
Glass rub with silk is defined as positive
Observed:
Tape pulled from table is negative
Conclusion:
We have a reference known charge

21. D. What is the Sign of the Charge on the Tapes?
glass tubing, piece of silk
1. How can we find out what the actual charge is on the pieces of tape?
Check the textbook or the internet to find out how the sign of a charge was defined by Ben Franklin.
Glass acquires a + charge
when rubbed with silk

22. D. What is the Sign of the Charge on the Pieces of Tape?
3. Use the information to find and the record the charge on each of the pieces of tape.
’A’ _____ (-) ‘B’ ____ (-)
‘C’ _____ (-) ‘D’ ____ (+)
Skip Electrostatic Series

23. Day 15 Feb 28

24. F. Electrostatic Series 1A3F p 17
clear rod glass white rod (PVC)
Teflon Silk Rabbits fur
cling wrap wool
1. Set up the electroscope with a ‘-‘ piece of tape on it.
2. Rub the clear rod, glass, silk, white rod, and Teflon with the rest of the items one at a time. Identify the sign of the charge on each using the electroscope.

25. F. Electrostatic Series 1A3F p 17
Silk Wool Cling Rabbit
Wrap fur
clear rod ___ ___ ___ ___
glass rod ___ ___ ___ ___
white rod ___ ___ ___ ___
Teflon ___ ___ ___ ___

26. F. Electrostatic Series 1A3F p 17
Rank order the items from:
Materials tend to receive electrons and become NEGATIVELY CHARGED
Materials tend to lose electrons and become POSITIVELY CHARGED

27. F. Electrostatic Series
Materials tend to
receive electrons
and become
NEGATIVELY
CHARGED
lose electrons
POSITIVELY
Teflon
Vinyl (PVC)
Saran wrap
Polyester
hard rubber
rubber balloon
sealing wax
Lucite
wood
paper
silk
cat’s fur
wool
nylon
glass
rabbit’s fur
Teflon
Vinyl (PVC)
Cling wrap
rubber balloon
silk
wool
Clear rod
Rabbits fur
glass

28. H. Charging by Contact
1. Rub the white rod with wool.
2. Touch sphere to white rod

29. H. Charging by Contact Charge on: Rod ___ (-) Sphere ___ (+)
What happened to the sphere?
If the little sphere does not continue to be repelled by the rod, continue moving the sphere along the rod until the sphere is constantly repelled by the white rod.
Why must this be done?
Rod is an insulator, charges not free to move on the rod
Charge on: Rod ___ (-) Sphere ___ (+)

30. H. Charging by Contact
6. Check and record the charge on white rod and sphere with your electroscope.
Rod ____ Sphere ____
7. Briefly explain what is going on.
Charge on: Rod (-) Sphere _ (-) __ (+)

31. I. Charging by Induction
(wool, white rod, sphere on string, electroscope)
1. Rub white rod with wool
2. With sphere near the white rod, touch sphere with finger making sure the sphere does not touch the white rod.
3. Check charge using the electroscope.
Rod ______ (-) Sphere _____ (+)
4. Explain what took place.

32. I. Charging by Induction
Electrons escape from sphere
Positive charges remain near rod.
Electrons move to opposite side.
Remove rod.
Touch with finger.
Remove finger.
Induction Explanation
Bring sphere near negative strip.

34. G-1. Induced Charge Separation Inv. p 41
1. Rub white rod with wool
2. Place two spheres so that
they are touching.

35. G-2. Induced Charge Separation
2. Bring rod near left sphere.

36. G-3. Charge Separation
3. With the charged rod still in position, separate the two spheres and place them upright on the table

37. G-4. Charge Separation
4. Remove the charged rod.

38. G-5. Charge Separation
5. With the plastic rod still charged, touch the small sphere to the charged rod until it acquires the same charge as the rod.

39. 6. Remove white rod using care not to touch the sphere.
G-6. Charge Separation
6. Remove white rod using care not to touch the sphere.

40. 7. Bring small sphere near each large sphere.
G-7. Charge Separation
7. Bring small sphere near each large sphere.
What happened?

41. What is the charge on each?
G-8. Charge Separation
What is the charge on each?

42. G-1. Induced Charge Separation Inv. p 41
What happened?
Induced Charge movement
Which charge moved?
Negative only

43. Brought white charged strip near one of spheres.
G-9. Charge Separation
Explanation
Brought white charged strip near one of spheres.

44. G-1. Induced Charge Separation Inv. p 41

45. Spheres were separated.
G-10. Charge Separation
Spheres were separated.
White rod was removed.
Spheres were charged:

47. (charged electroscope, match)
K. Burning Off Charges
(charged electroscope, match)
1. Hang 2 negative charged pieces of tape on opposite sides of the electroscope horizontal arm.
2. Bring burning match near the charged pieces of tape.
3. Record what happens to the pieces of tape. Explain what happened.

48. Hand out worksheet as homework
L. Concept Development 32.2
Hand out worksheet as homework

51. M. Electrophorus - 1E4 p 39 What did you observe? Why did this happen?
Remove apparatus from foam
Touching only the cup, place apparatus on the foam
What is the charge on the foam?
Rub foam with wool.
What does this tell us about the charge on the pan?
What did you observe?
Tape cup to aluminum pan.
Tape straw with piece of aluminum foil to the cup.
aluminum plate, scotch tape, foam cup, piece of foam, wool
No Charge on Pan

52. Touch bottom of aluminum plate with finger. Place apparatus on foam.
Electrophorus -
How does this happen?
Remove finger.
Touch bottom of aluminum plate with finger.
Remove plate from foam.
Check charge on plate.
Check charge on foam.
Place apparatus on foam. 56 56

53. Electrophorus - ‘-’ repelled from bottom to top of plate
Electrons leave plate
Charges rearrange
Finger removed from plate
Finger touches plate
Remove plate from foam
‘-’ repelled from bottom to top of plate
Leaving ‘+’ behind
Place plate on negative foam
Foam rubbed with wool
Explanation
Wool gives ‘-’ to foam

54. N. Demo: Electrostatic Attraction
Metal Rod, Teflon rod,
plastic coat hanger
Describe and explain what happened.

55. O. Demo: Electrostatic Attraction
Wood Board with
Teflon, Clear Rod and fur
Describe and explain what happened.

56. Day 16 Mar 1

57. Sent ≈ 1:00 pm
Enclosed is the summary of the title and URL of various sites that you reported. Should you have the time and desire, you might look at some of the URL's of Assignment. There is no specific assignment due until after the next class on the 13 of March. Have a restful rewarding break and return energized ready to finish the semester in an outstanding manner.

58. P. Demo: Electrostatic Attraction
Pop Cans with
Teflon, Clear Rod and Fur
Describe and explain what happened.

59. R. Electrical Units

60. Electrical Units
Electric Potential

61. Electrical Units
Current

62. What is a volt times an amp?
Electrical Units
What is a volt times an amp?

63. What is an kilowatt-hour?
Electrical Units
What is an kilowatt-hour?

64. S. Van de Graaff Generator
How is it constructed?
Page 527 of text

65. Van de Graaff Generator
How dangerous is our
Van de Graff generator?

66. Spark jumps in dry air when
Van de Graaff Generator
Spark jumps in dry air when
Spark jumps ___6__ cm.
Electric Potential Difference is?
V = __1.8 E5___ volts

67. Van de Graaff Generator
Taken from our generator and data sheet.
How dangerous is a spark?
____1.8 E5___ volts x 10 micro-amps
= __1.8__ watts
Spark lasts for 10 micro-sec
____ watts x 10 micro-sec
___1.8 E -5_____ Joules

68. Van de Graaff Generator
Taken from data sheet.
How dangerous is a spark?
350,000 volts
350,000 volts, 10 micro-amps
3.50 watts
Spark lasts for 10 micro-sec
3.5 watts . 10 micro-sec
3.5 x 10-5 Joules

69. Describe and explain what happened.
T. Van de Graaff Demo
Graphite Sphere
Describe and explain what happened.

70. Describe and explain what happened.
U. Demo: Franklin Alert
Describe and explain what happened.

71. Describe and explain what happened.
V. Demo: Glowing Ne2
Describe and explain what happened.

72. W. Demo: Fluorescent tube
Describe and explain what happened.

73. Describe and explain what happened.
X. Demo: Charge a Person
Describe and explain what happened.

74. Y. Demo: Christmas Tinsel
Describe and explain what happened.

75. Describe and explain what happened.
Z. Demo: Precipitator
Describe and explain what happened.

76. AA. Demo: Propane Lighter Flame
Describe and explain what happened.

77. AB. Demo: Aluminum Pie Pans
Describe and explain what happened.

78. Mar 13

79. AC. Kelvin Water Drop Generator
Describe and explain what happened.

81. AD. Construct Lyden Jar 132 1G1, 1G2 p 55
35 mm film canister with lid
paper clip, aluminum foil, water
1. Cover the side and bottom of a film canister within 0.5 cm of top with aluminum foil
2 Punch hole in lid of film canister

82. AD. Construction Lyden Jar
3. Unbend paper clip, with small bend at one end.
4. Insert pointed end of clip into lid until it touches the bottom of the film canister
5. Fill canister within 1 cm of top with water.
6. Place lid on canister

83. Student Investigation
While holding the film canister, touch it to the dome of the van de graaff generator
Next touch foil and paper clip at the same time with finger and thumb of one hand.
Describe what happened.

84. AE. Demo: Dissectible Lyden Jar
Describe and explain what happened.

85. Describe and explain what happened.
AF. Demo: Ice Pail
Describe and explain what happened.

86. Where is a safe place outside when an electrical storm is present?
Discussion
Where is a safe place outside when an electrical storm is present?
Automobile?
Why?

87. AG. Demo: Plastic Peanuts in
Foam Cup Metal Can
Describe and explain what happened.

88. AH. Discussion How safe is an automobile? airplane? Handout
Lightning Bolt Shatters Safetiy Rule

89. Why do some homes and barns have lightning rods?
AI. Lighting Rods
Why do some homes and barns have lightning rods?
Video Lightning

90. AJ. Demo: Cloud Discharge
Demo: Use two aluminum pans connected to van de Graaff to demonstrate cloud
- set pointed object in bottom of pan
Describe and explain what happened.

91. AK. Static Electricity at Gas Pump

92. Video
Lightning

93. That’s all folks!

94. Equipment ___ Box B-05 Old Batteries ___ Box E-01 Electrostatics
___ Box E-04 Electrostatics, Rods
___ Box E-04a Electrostatics
___ Box E-05 Kelvin Water Drop
___ Box E-06 Electrostatics
___ Box E-07 Electrostatics
___ Box E-10 Foam Squares
___ Box E-11 Electrostatics Lab
___ Box Film Canisters
___ Box New Batteries
___ Box Petri Dishes
___ Box Pop Cans
___ Box Scotch Tape
___ Box White Rods
___ Van de Graff Generator
___ Van de Graff Generator Sphere
___ Video Lightning
___ Box Fly Sticks

95. M. Electrophorus - 1E4 p 39 What did you observe? Why did this happen?
Remove apparatus from foam
Touching only the cup, place apparatus on the foam
What is the charge on the foam?
Rub foam with wool.
What does this tell us about the charge on the pan?
What did you observe?
Tape cup to aluminum pan.
Tape straw with piece of aluminum foil to the cup.
aluminum plate, scotch tape, foam cup, piece of foam, wool
No Charge on Plate

96. Touch bottom of aluminum plate with finger. Place apparatus on foam.
Electrophorus -
How does this happen?
Remove finger.
Touch bottom of aluminum plate with finger.
Remove plate from foam.
Check charge on plate.
Check charge on foam.
Place apparatus on foam.
101
101

97. That’s all folks!

98. Touch bottom of aluminum plate with finger. Place apparatus on foam.
Electrophorus -
How does this happen?
Remove finger.
Check charge on plate.
Remove plate from foam.
Touch bottom of aluminum plate with finger.
Check charge on foam.
Place apparatus on foam.
Touching Plate on Foam

99. aluminum plate, scotch tape, foam cup, piece of foam, wool
M. Electrophorus - 1E4 p 39
aluminum plate, scotch tape, foam cup, piece of foam, wool
Check charge on foam.
Rub foam with wool.
Check if there is a charge on plate
by touching plate to cheek.
Touching only the cup,
place apparatus on foam.
Tape cup to aluminum plate.
Remove plate from foam.
No Charge on Plate
Setting Plate on Foam
104
104