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Intro. Size of electron and electron orbit in respect to perceived matter. Force: electron and proton vs. gravity Tape, wool, balloon, paper punch holes, graphite styrofoam balls. Warm up. b. Given: a=3, b=3 Find  Given: a=4, b=7 Find  Given: a=5, b=8 Find . a. c. .

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Intro

Intro

  • Size of electron and electron orbit in respect to perceived matter.

  • Force: electron and proton vs. gravity

  • Tape, wool, balloon, paper punch holes, graphite styrofoam balls


Warm up

Warm up

b

  • Given:

    • a=3, b=3

    • Find 

  • Given:

    • a=4, b=7

    • Find 

  • Given:

    • a=5, b=8

    • Find 

a

c


Electrostatics

Electrostatics

Force and Charge


Charges

Charges

  • Like charges repel

  • Opposite charges attract


Like charges

Like charges

  • Each strip of clear tape has the same type of charge when prepared in the same manner (i.e. both positive or both negative)

    • These strips of tape repel each other


Opposite charges

Opposite charges

  • When one strip is peeled from the roll and one strip is peel from the desk, the charges are opposite.

    • These strips of tape attract each other.


Electrostatic related words

Electrostatic related words

  • Neutral

    • Equal number of positive and negative charges

  • Insulator

    • Charge does not move easily through this material (e.g. plastic or styrofoam)

  • Conductor

    • Charge moves easily through this material (e.g. metals)


Electric force

Electric Force

Force between two point sources


Electric force1

Electric force

  • Two kinds of electric charges: positive and negative

  • Charges exert forces on other charges at a distance (contact not required)

  • The force decreases with distance

  • Like charges repel; opposite charges attract.


Electroscope

Electroscope

  • Charging by conduction: object come into contact

  • Charging by induction: object are in proximity but never touch (requires grounding)

  • Examples

    • Wool

    • Monitor

    • Tape

    • Balloon

    • Van Degraff

    • Plastic

Example: electroscope


Charging by conduction

Charging by conduction

  • A charge is created on an object.

  • The object is brought into contact with another object.

  • The electrons transfer to even out the distribution

Example: pans


Charging by induction

Charging by induction

  • Charge is created on an object.

  • The object is brought near another object (which is grounded).

  • The charged object repels or attract electrons on the grounded object.

  • The grounded object transfers electrons to or from the ground to reach equilibrium.

  • If the ground is removed, the previously grounded object will have an unbalanced number of electrons and now be charged.

Example: styrofoam


Force and distance

Force and distance

  • Force increases with charge

  • Force decreases with distance


Proportional to the inverse square

Proportional to the inverse square

  • qA=10C, qB=10C

    • r=1mm

    • r=1.414mm

    • r=2mm

    • r=3mm

    • r=4mm

    • r=5mm

    • r=6mm

  • Find the pattern

    Pg 552 #11


Homework

Homework

  • Pg 557:

    • Explain Key Concepts in your own words.

    • Relate to your things you experience in real life.

  • Ch 20 Study Guide

  • Pg 558 #20-40

  • Pg 559 #42-49, 51,59,60


Concepts section 1

Concepts section 1


Concepts section 2

Concepts section 2


Your topic goes here

Your Topic Goes Here

  • Your Subtopics Go Here


Your topic goes here1

Your Topic Goes Here

  • Your Subtopics Go Here


Transitional page

TRANSITIONAL PAGE


Elements

elements

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