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What materials will allow electricity to flow through them?

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1 point
conductors
insulators
vacuums
pendulums
When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?
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1 point
protons are transferred to the cloth
protons are transferred to the rod
electrons are transferred to the cloth
electrons are transferred to the rod
The picture shows a child sliding down a plastic slide. Which statement best describes why the child's hair stands up after he slides down the slide?
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1 point
Captionless Image
Energy was transferred from the slide to the child through induction, causing the child's hair to become charged and stand up.
Friction caused a transfer of electrons between the slide and the child, making each of his like-charged hairs repel each other.
Energy was transferred from the child to the slide through conduction, causing the child's hair to become charged and stand up.
Friction caused a transfer of electrons between the slide and the child, making his like-charged hairs attract the air through induction.
The picture shows a balloon and a portion of a wall with a neutral charge. If a student rubs the balloon against his or her hair, giving the balloon a negative charge, which image correctly shows the how the charges in the balloon and wall will be arranged?
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1 point
Captionless Image

A

B

C

D
A negatively charged rod touched a mounted sphere. The results were that the sphere acquired a negative charge at the location of the point of contact. What does this result mean for the sphere touched?
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1 point
Captionless Image
The sphere is a conductor because the charge acquired remained in the location of contact.
The sphere is a conductor because the charge was distributed across the surface of the sphere.
The sphere is an insulator because the charge was distributed across the surface of the sphere.
The sphere is an insulator because the charge acquired remained in the location of contact.
A student is investigating the distribution of charge in a conductor. He attaches two unopened soda cans on their sides to two foam cups with tape. He sets the soda cans with the cups onto a tabletop so that they are touching one another. Then he moves a negatively charged balloon close to the left soda can. The set up for the investigation is shown. How do the electrons move in the soda cans?
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1 point
Captionless Image
They move to the top of both cans.
They move to the bottom in both cans.
They move from the right can to the left can.
They move from the left can to the right can.
A student is investigating what happens when a neutral metal sphere sitting on an insulated stand is touched by a negatively charged rod. The set up for the student's investigation is shown in the diagram. What will happen to the excess electrons when the negatively charged rod touches the metal sphere?
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1 point
Captionless Image
The excess electrons will move from the sphere to the rod and spread out along the rod.
The excess electrons will move from the rod to the sphere and spread out on the sphere.
The excess electrons will move from the rod to the sphere and stay clustered in the area where the rod touches the sphere.
The excess electrons will move from the sphere to the rod and stay clustered near the end of the rod that touches the sphere.
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1 answer

Here are the correct answers to the questions based on the principles of electricity and charge:

  1. What materials will allow electricity to flow through them?

    • Conductors

  2. When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?

    • Electrons are transferred to the cloth

  3. The picture shows a child sliding down a plastic slide. Which statement best describes why the child's hair stands up after he slides down the slide?

    • Friction caused a transfer of electrons between the slide and the child, making each of his like-charged hairs repel each other.

  4. If a student rubs the balloon against his or her hair, giving the balloon a negative charge, which image correctly shows how the charges in the balloon and wall will be arranged?

    • (Without the images, I can't select one, but when a negatively charged balloon approaches a neutral wall, the wall's positive charges will be attracted towards the side nearest to the balloon, creating a distribution of charge.)

  5. A negatively charged rod touched a mounted sphere. What does this result mean for the sphere touched?

    • The sphere is a conductor because the charge was distributed across the surface of the sphere.

  6. How do the electrons move in the soda cans when a negatively charged balloon is brought near the left soda can?

    • They move from the left can to the right can. (Electrons are repelled from the negatively charged balloon.)

  7. What will happen to the excess electrons when the negatively charged rod touches the metal sphere?

    • The excess electrons will move from the rod to the sphere and spread out on the sphere.

Feel free to ask if you have more questions or need further clarifications!