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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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Presentation Transcript
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
your topic goes here
Your Topic Goes Here
  • Your Subtopics Go Here
your topic goes here1
Your Topic Goes Here
  • Your Subtopics Go Here
elements

elements

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