1. NSDL/NSTA Web Seminar: Charging into Electrostatics
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NSDL/NSTA Web Seminar:
Charging into Electrostatics
Tuesday, January 30, 2007
7:00 p.m. to 8:00 p.m. Eastern time

2.
Access to multiple collections in Physics and Astronomy
ComPADRE: the NSDL Physics &
Astronomy Pathway
PhysicsFront.org Special ComPADRE collection for secondary level teachers
Still intro, mention of Pathways and NSDL

3. Charging into Electrostatics
An NSDL/AAPT/ComPADRE
Presentation by
Jan Mader and Dr. Cathy Ezrailson

4. Test Yourself
In which direction will charges move in the diagram shown:
To the left
To the right
The electrons will not move + -
Charges moved

5. “Static” Electricity When you comb your hair and…
… bring your comb over a pile of paper bits

6. What will happen? Stamp your answer
“Static” Electricity
What will happen? Stamp your answer
A B.

7. “Static” Electricity
The force felt by the paper bits is due to a difference in charge on the comb compared to the paper.
This “force of attraction” was first observed by the Greeks who found that piece of amber (“elektron”) attracted other objects when rubbed.

8. Match the diagram below with its correct description.
Excess of Electrons Net Charge Negative
Deficiency of Electrons Net Charge Positive
Balanced atom Net Charge Zero
Volunteers with separate colors: Red,Yellow, Green A. B. C.

9. “Static” Electricity
Usually charges balance each other out, and nothing happens. But when two objects with like charges (all positive or all negative) come together, the charges repel and the objects move away from each other.
Objects with opposite charges attract each other because the different charges want to balance each other. 
Objects can get a negative charge by picking up electrons from other objects.

10. Common Misconceptions about “Static” Electricity
Actually, the thing we call static electricity is an imbalance in the amounts of positive and negative charges found on the surface of an object.

11. Results in a transfer of charges
Methods of Charging
Direct contact
Induction
Direct contact label replaced. Picture swapped.
Usually results in a temporary rearrangement of charges
Results in a transfer of charges

12. Common Misconceptions about “Static” Electricity
Lightning is like static electricity, except on a much bigger scale. Both lightning and static electricity happen because of the attraction between the opposite charges.

13. Self Check? Charges flow from less negative to more negative areas.
True
False
Charges flow from less negative to more negative areas.
True
False
Like charges repel.

14. Pt II: Making a Magic Tape Electroscope
First Step:
Bend back one end on each of two tapes to make a handle.
Second Step:
Lay each piece of magic tape on top of each other on a smooth surface.

15. Making a Magic Tape Electroscope
Third Step:
Pick up the tape “handles” and pull the tapes apart.

16. Making a Magic Tape Electroscope
The tapes separate as shown. What do you think causes this to occur? 1. 2. 3.

17. Making a Magic Tape Electroscope
Charges on the surface of the tapes shown are alike
Do we know whether these charges are positive or negative?
How could we tell?
Write your answers on the chat

18. Charge Quiz What are the charges on the objects shown?
Use the + or – stamp to indicate the charge on the picture
Added third image, pick a volunteer from ES,MS, HS respectively
How can you tell?

19. PT III: Charging an Electrophorus
Set the pie tin down on the picnic plate. Hold it by the plastic cup.
Rub the Styrofoam plate with cloth or a paper towel.

20. Using an Electrophorus to Store Charge
Touch the foil-wrapped cardboard and the pie tin at the same time, then let go.
Hold the plastic cup and lift the pie tin. Touch it to the nail on the Leyden Jar. Repeat.

21. The Leyden Jar
The Leyden jar is a device for storing electric charge invented in 1745 by Pieter van Musschenbroek (1700–1748).
Mr. Muschenbroek’s bottle is referred to as the “phial” by Benjamin Franklin. Today, we would call it a capacitor.

22. Charging by Induction Quiz
Does the diagram below illustrate permanent or temporary charging by induction?
Step I Step I I Step I I I Step IV
Permanent
Temporary

23. ThePhysicsFront Resources
Let’s go to The Physics Front and look at what resources are available to you and your fellow teachers

24. Credits
Benjamin Franklin and Electrostatics by Robert Morse
Museum of Science, Boston,
The Weather Eye
Practical Physics, published in 1914 by Macmillan and Company

25. Go to http://nsdl.org and click on the K-12 audience page
Download this seminar’s companion guide with resources from the seminar and more
Expert Voices blog with our presenters
Robert concludes

26. THANK YOU! Robert Payo Dr. Cathy Ezrailson Jan Mader http://nsdl.org
ThePhysicsFront.org
Dr. Cathy Ezrailson
THANK YOU!
Jan Mader
Robert Payo

27. National Science Teachers Association
Gerry Wheeler, Executive Director
Frank Owens, Associate Executive Director Conferences and Programs
Al Byers, Assistant Executive Director e-Learning
NSTA Web Seminars
Flavio Mendez, Program Manager
Jeff Layman, Technical Coordinator
Susan Hurstcalderone, Volunteer Chat Moderator
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