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

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Presentation transcript:

Electric force

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

ELABORATE Let’s expand upon what we just learned!

van de Graaff generator

Preview Questions

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

Apply what you know! Answer the questions in your notes

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

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

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

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

Example #2

BACKUP

Observation 5: Induction part A

Observation 6: Induction part B

Observation 7: Induction Part C

Observation 8: Induction Part D