1. Electric force

2. Review 1.Define polarize 2.Define conduction 3.Define induction

3. ELABORATE Let’s expand upon what we just learned!

4. van de Graaff generator

5. Preview Questions

6. van de Graaff generator Purpose: make static electricity for experiments Turn on the generator, then….. – Voltage applied + charges the belt – Motor rotates the bottom pulley – Belt rotates – Comb is right above belt; dome is attached to comb – Comb and dome become charged

7. Apply what you know! Answer the questions in your notes

8. Check for Understanding & Summary 1. Upper metal comb becomes polarized: e- move to the edge of the comb b/c they are attracted to the + rubber belt – The upper comb is already grounded – e- transfer from ground to the comb  Comb becomes neg. charged by induction

9. Check for Understanding & Summary 2. Comb is attached to dome. Electrons transferred from comb to dome by conduction. Dome now has - charge 3. Person gets close to dome and gets shocked: negative charge (electrons) transferred by induction 4. Person touches the dome – electrons transferred by conduction

10. Key Points Law of Conservation of Charge – overall charge on a system is the same before and after the charging process Charges do not disappear only e- are transferred (positive charges cannot be transferred) Proton: + charge

11. Key Points Proton: + charge Electron: - charge Neutron: neutral charge

12. Example #2

13. BACKUP

14. Observation 5: Induction part A

15. Observation 6: Induction part B

16. Observation 7: Induction Part C

17. Observation 8: Induction Part D