Do Now

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Do Now

• Why does it matter if the gas container is on the
  truck or the ground?

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Static Electricity
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Electric Charge

• Electric Charge an electrical property of
  matter that creates a force between objects
• Charged versus Uncharged Objects

Negatively-Charged Possess more electrons than
protons
Uncharged Equal numbers of protons and electrons
Positively-Charged Possess more protons than
electrons
Only electrons move!!!
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• Human hands (usually too moist, though) Very
  positive
• Rabbit Fur
• Glass
• Human hair
• Nylon
• Wool
• Fur
• Lead
• Silk
• Aluminum
• Paper
• Cotton
• Steel Neutral
• Wood
• Amber
• Hard rubber
• Nickel, Copper
• Brass, Silver
• Gold, Platinum

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• Like charges repel, and opposite charges attract

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Conductors

• Materials that transfer charge easily. (allow
  electrons to flow through)
• Metals
• Aqueous solutions (water)
• Graphite
• Human body

• Conductors do not hold charges well

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Insulators

• Materials that do not transfer charge easily.
• Rubber
• Glass
• Wood
• Dry air
• Plastic
• Paper/cardboard

• Insulators do hold charge well.

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Charging by friction

• Pulling electrons off of another object
• Sliding socks across rug
• Rubbing balloon on hair
• Basically, most types of friction

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Charging by contact

• A charged object touches another, transferring
  electrons

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Charging by induction

• Polarization of charges
• Separating positive and negative charges within
  an object.

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Check Your Understanding
What type(s) of charging does this guy
encounter???
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(No Transcript)
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Questions

• Why is there more static electricity in the
  winter?
• What is a semiconductor?
• What is a superconductor?
• Why dont we get seriously injured from the Van
  de Graaff generator?