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Transcript of Do Now (8/26/13): Welcome! 1.Find your seat 2.Write your name on the notecard on your desk.
![Page 1: Do Now (8/26/13): Welcome! 1.Find your seat 2.Write your name on the notecard on your desk.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649efc5503460f94c0ef97/html5/thumbnails/1.jpg)
Do Now (8/26/13):
Welcome!
1.Find your seat
2.Write your name on the notecard on your desk.
![Page 2: Do Now (8/26/13): Welcome! 1.Find your seat 2.Write your name on the notecard on your desk.](https://reader035.fdocuments.us/reader035/viewer/2022070410/56649efc5503460f94c0ef97/html5/thumbnails/2.jpg)
Brainstorm:
1.What does the word “charge” make you think of?
2.What is the definition of the word “static”?
3.Describe the parts and structure of an atom.
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Chapter 20Static
Electricity
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Intro
• Syllabus
• Course outline
• BPI webpage
• Vocab
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Electrostatics•The study of
charges that can be collected and held
in one place
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With your “elbow partner” come up with examples where charge differences build up in nature, and describe the
consequences
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Charge•Caused by an
electron imbalance as electrons move
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Atomic Charge•In neutral atoms
the number of electrons = the
number of protons
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Charge•Opposite charges
attract & like charges repel
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Charge Conservation•electric charge can
neither be created nor destroyed.
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Charge•The charge of an
object leaks off into water
molecules in air
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Charge•Charged objects eventually return to their neutral
state
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Charge•Holding a charge is easy on dry days & difficult on humid
days
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Conductors•Materials like
metals that allow electrons or
charges to move
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Common Conductors
•Copper, silver, gold, aluminum, &
graphite
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Insulators•Materials that will not allow electrons or charges to move
easily
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Common Insulators
•Glass, dry wood, plastic, rubber, &
dry air
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Electron Sink•Anything that can
absorb lots of electrons
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Common Electron Sinks•People, Earth, etc
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Electroscope•A device used to
detect electrical charge
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Charge Redistribution•Conduction•Induction
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Charge by Conduction
•Charge by touching a charged body to a
neutral body
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Charge by Induction
•Charge by moving a charged body
near a neutral body
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Charge Separation on Neutral Objects
- - - + - - - + - - - + - + - + - + + + - + + + - + + +
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Do Now (8/27/13):
• Complete the pre-lab
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Do Now (8/28/13):
• Complete the Drill sheet
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Electrical Force•Force caused by the
attraction or repulsion of charges
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Electrical Force•Electrical force must be much greater than
gravitational force
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Coulomb’s Law•Force between charges
is proportional to charge & inversely
proportional to distance between charges
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Coulomb’s Law
F qAqB
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Coulomb’s Law
F 1d2
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Coulomb’s Law
F qAqB
d2
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Fe Formula
Fe = KqAqB
dAB2
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Electric Constant
K = 9.0 x 109 Nm2
C2
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Identify another formula that is very
similar to the electrical force
formula
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Gravity Formula
Fg = GmAmB
dAB2
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The magnitude of the force is inversely proportional to the square of the distance
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Calculate the electrical force occurring when a ball with a charge of 2.0 x 10-8 C is 12 mm from
another ball with a charge of -3.0 x 10-8 C:
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Calculate the electrical force occurring when a ball with a charge of 3.0 x 10-4 C is 12 mm from
another ball with a charge of -6.0 x 10-6 C:
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Millikens Oil Droplet
Experiment
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Electron Charge
1.60 x 10-19 CC = Coulombs
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Calculate the force between 2 electrons8.0 x 10-3 nm apart:
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Calculate the force between the electron
& the nucleus of hydrogen:
4.0 x 10-2 nm apart:
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Do Now (8/29/13):
• Complete the Drill sheet
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Do Now (8/30/13):
• Complete the Drill sheet
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A
B C
dAB = 4.0 mmdBC = 3.0 mm
qA = - 4.0 x 10-5 CqB = 3.0 x 10-5 CqC = 9.0 x 10-5 C
Calculate: Fe on B
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A
B C
dAB = 4.0 mmdBC = 3.0 mm
qA = - 4.0 x 10-5 CqB = 3.0 x 10-5 CqC = 9.0 x 10-5 C
Calculate: Fe on A
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A
B C
dAB = 4.0 cmdBC = 3.0 cm
qA = 3.0 x 10-5 CqB = 3.0 x 10-5 CqC = 6.0 x 10-5 C
Calculate: Fe on C
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Calculate the force between 2 particles1.2 x 10-3 m apart:
q1 = 4.0 x 10-5Cq2 = - 4.0 x 10-5C