Lecture 4 Electric Charge Coulomb’s Law Gecko Electric charge.
Today: Cornell Notes See me for your NEW SEAT NUMBER Get paper for CORNELL NOTES TOPIC: ELECTRIC...
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Transcript of Today: Cornell Notes See me for your NEW SEAT NUMBER Get paper for CORNELL NOTES TOPIC: ELECTRIC...
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Today: Cornell Notes
• See me for your NEW SEAT NUMBER
• Get paper for CORNELL NOTES
• TOPIC: ELECTRIC CHARGE• Essential Question: How
does electric charge behave and how do we create charged objects?
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How many types of charge are there?
• Sticky Tape Lab• Two Types of Charge• Benjamin Franklin
called them “Positive” and Negative”
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What rules do they follow?
• Two “top” tapes repel• Two “bottom” tapes
repel• A “top” and a
“bottom” tape attract• So: Like charges
repel, opposite charges attract
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What causes this charge?
• Electrons and Protons • Electrons are negative• Protons are positive• (Rutherford discovered
that the nucleus of an atom has a positive charge)
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Review: Bill Nye the Science Guy
• 2:15 – 4:46• How did Bill get the
charges onto his Rockin’ Hair?
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Separation of Charge
• He SEPERATED the charges!• There’s no such thing as an object
with NO charges – everything has charges!
• Usually the positives and negatives cancel each other out.
• To make a “charged” object – you have to move the charges around.
• To make a “negative” object – gather up a bunch of electrons.
• How do you make a “positive” object?
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Conductors and Insulators
• Insulators – charges do NOT move easily
• Conductors – charges DO move easily
• Examples?• Air is USUALLY an
insulator – when is it not?
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Charging by Conduction(Basically, by touching)
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Separation of Charge on Neutral Objects
• Yeah, but how did your charged tape attract the neutral paper without touching it? Or the charged balloon stick to the neutral sweater? Why was Bill’s “Silver-Painted Ball” attracted to his charged wand?
• This is like the Balloon and the Wall in the lab from Friday
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Charging by Induction(Basically – without touching)
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Bill Nye Says: Consider The Following
• What do we mean by Grounding the charge?
• 7:36 – 9:07