Intro

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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

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Warm up
b

• Given
• a3, b3
• Find ?
• Given
• a4, b7
• Find ?
• Given
• a5, b8
• Find ?

a
c
?
3
Electrostatics

• Force and Charge

4
Charges

• Like charges repel
• Opposite charges attract

5
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

6
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.

7
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)

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(No Transcript)
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Electric Force

• Force between two point sources

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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.

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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
12
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
13
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
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Force and distance

• Force increases with charge
• Force decreases with distance

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Proportional to the inverse square

• qA10C, qB10C
• r1mm
• r1.414mm
• r2mm
• r3mm
• r4mm
• r5mm
• r6mm
• Find the pattern
• Pg 552 11

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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

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Concepts section 1
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Concepts section 2
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Your Topic Goes Here

• Your Subtopics Go Here

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Your Topic Goes Here

• Your Subtopics Go Here

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TRANSITIONAL PAGE
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elements

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