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21 Cards in this Set
- Front
- Back
Conductors and insulators are two broad categories of what? |
Electricity |
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What is a good conductor of heat and electricity? |
Metal |
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What conducts neither heat nor electricity? |
Insulators |
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What is the difference in how electrons behave when it comes to conductors and insulators. |
Conductors have a lot of free electrons to move, insulators have very little. |
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Are atoms electrically positive, negative, or neutral? |
They are neutral. They have the same number of protons and electrons. |
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What happens to electrons that move away from the nuclues? |
They are less attracted to it. |
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What happens when an atom loses electrons? |
It becomes positively charged |
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What happened when an atom gains electrons? |
It becomes negatively charged |
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Why do we experience static in the winter? |
Because it's is so dry the electrons are less tightly bonded. |
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What happens to positive and negative charges when close to one another? |
They are attracted. |
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What happens when two positive or two negative charges are near each other? |
They are repelled. |
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Positives and negatives are two types of what? |
They are to types of charges |
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Which law states that the electrical force between two charges is given by F = K(q1q2/r²) where q1 is charge one, q2 it's charge two, and r is the distance between the charges? |
Coulomb's Law |
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What does K equal in Coulomb's law? |
K = 9.0 * 10^9 * Nm²/c² |
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What is the unit of charge? What is its symbol? |
The unit is one Coulomb (C). The symbol is Q or q. |
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What's is one microcoulumb? |
μC or x * 10^-6C |
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What is the best way to calculate electric force? |
Isolate the exponents and multiply by the remaining ones:
9*10^9 * 2*10^-6 * 7*10^-6/(.2²) = (9*2*7/(.2²)*10^9-6-6 = 3150 * 10^-3 = 3.15N. |
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What law is F = α * 1/distance² |
The inverse square law. |
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What does the inverse square law do? |
It means that force is inversely related to distance. |
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Using the inverse square law, originally F = 10N between two charges, if you increase the distance to twice its original value? |
F = 1/2² = (1/4)N |
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Is force a vector or scalar quantity? |
It is a vector quantity, meaning that you need to figure out the direction of each force. |