13 Static Electricity

What causes the phenomenon of static electricity?

• The movement of neutrons

• The action of charged particles like protons and electrons

• The interaction of magnetic fields

• The flow of water molecules

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NGSS.MS-PS2-3

What is the basic force law of electrostatics?

• Like charges attract

• Opposite charges attract

• Like charges repel

• Opposite charges repel

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NGSS.HS-PS2-4

Which of the following is an example of charging by friction?

• Rubbing a balloon on your hair

• Touching a metal doorknob

• Holding a magnet near a paperclip

• Placing a battery in a flashlight

What happens to the atomic charges of objects when they are charged by friction?

• They remain unchanged

• They become neutral

• They are transferred between objects

• They disappear

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NGSS.MS-PS2-5

If an atom has lost one electron, will it be positively or negatively charged?

• Positively

• Negatively

• Neutrally

• It depends on the atom

According to Coulomb's law, the strength of the attraction or repulsion force is proportional to which of the following?

• The product of the charges divided by the square of the distance

• The sum of the charges divided by the distance

• The difference of the charges multiplied by the distance

• The product of the charges multiplied by the distance

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NGSS.HS-PS2-4

If two charges are initially 1 meter apart and are then separated to a distance of 2 meters, the force is reduced to what fraction of its original value?

• 1/2

• 1/4

• 1/3

• 1/5

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NGSS.HS-PS2-4

What is the SI unit of electric charge?

• Coulomb

• Meter

• Newton

• Joule

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NGSS.HS-PS1-3

In Coulomb's law, what does the variable k represent?

• Charge

• Distance

• Constant of proportionality

• Force

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NGSS.HS-PS2-4

Does the length of the electric field vectors get longer or shorter as we get farther away from the charge?

• Longer

• Shorter

• Stays the same

• Disappears