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Ch. 2 Sec. 1 Electric Charge & Static Electricity
YouTube video-Bill Nye Static Electricity
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Interactions Between ChargesInteractions Between Charges
• same
• differentrepel
attract
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electric field
• exerts force on other charged particles
• extends outward from every charged particle
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static electricity
•buildup of charges on an object
– charges build up - do not flow
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•neutral object becomes charged by gaining or losing electrons
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• loses electronsmore protons positively charged
• gains electronsmore electrons negatively charged
++++
+
-
----
-
+ -+
+ - -
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STATIC TUBE ACTIVITYMATERIAL PREDICTION
# 1-5
(1= MOST
5= LEAST)
# OF STYROFOAM
PELLETS
COTTON (purple)COTTON (purple)
RAYON (red)RAYON (red)
NYLON (white)NYLON (white)
SILK (yellow)SILK (yellow)
WOOLWOOL (brown tweed) (brown tweed)
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3 methods by which
charges are transferred
friction conduction induction
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frictionfriction
• transfer of electrons by rubbing
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conconductionduction
• transfer of electrons by direct concontact
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inductioninduction
•movement of electrons caused by electric field of another object
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Examples of Static Cling
–clothes sticking together in clothes dryer
–wrapping food with plastic wrap
–using a photocopier
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• when negatively charged object & positively charged object brought together electrons move until both objects have same charge
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static discharge • loss of static electricity as electric charges move off an object
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Lightning is a dramatic example of static discharge.
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● electroscope
instrument that detects electric charge
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Van de Graaff generator
• Produces static electricity
• Electrons are carried up a rubber belt & are transferred to the metal sphere
• The charge built up on the sphere is enough to send a spark several meters through the air.
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Activity-The Versorium pg. 42
Unrubbed foam plate
Rubbed foam plate
Rubbed wool fabric
Aluminum Tent: Prediction
Aluminum Tent:
Observation
Paper Tent: Prediction
Paper Tent:
Observation