Isabella is researching how to charge objects through friction. Isabella rubs a balloon on her hair. When she pulls the balloon away from her hair, the hair is attracted to the balloon. Which BEST explains why the hair becomes attracted to the balloon? (1 point)
Responses
Rubbing the balloon along her hair creates protons that will stick to both the balloon and her hair.
Rubbing the balloon along her hair creates protons that will stick to both the balloon and her hair.
Rubbing the balloon along her hair creates electrons that will stick to both the balloon and her hair.
Rubbing the balloon along her hair creates electrons that will stick to both the balloon and her hair.
Rubbing the balloon along her hair moves protons from the balloon to her hair.
Rubbing the balloon along her hair moves protons from the balloon to her hair.
Rubbing the balloon along her hair moves electrons from her hair to the balloon.
The correct answer is: Rubbing the balloon along her hair moves electrons from her hair to the balloon.
You are holding two negatively charged balloons. What will happen if you bring the balloons close to each other?(1 point)
Responses
The amount of the electrostatic force between the balloons will decrease, and they will attract each other.
The amount of the electrostatic force between the balloons will decrease, and they will attract each other.
The amount of the electrostatic force between the balloons will decrease, and they will repel each other.
The amount of the electrostatic force between the balloons will decrease, and they will repel each other.
The amount of the electrostatic force between the balloons will increase, and they will repel each other.
The amount of the electrostatic force between the balloons will increase, and they will repel each other.
The amount of the electrostatic force between the balloons will increase, and they will attract each other.
The correct answer is: The amount of the electrostatic force between the balloons will decrease, and they will repel each other.
As you are sliding down a plastic slide in a playground, your hair stands up on its ends. Which statement best explains why your hair stands up after sliding down the plastic slide?(1 point)
Responses
Friction causes a transfer of electrons between the slide and you, making each of your like-charged hairs repel each other.
Friction causes a transfer of electrons between the slide and you, making each of your like-charged hairs repel each other.
Energy is transferred from you to the slide through conduction, causing your hair to become charged and stand up.
Energy is transferred from you to the slide through conduction, causing your hair to become charged and stand up.
Energy is transferred from the slide to you through induction, causing your hair to become charged and stand up.
Energy is transferred from the slide to you through induction, causing your hair to become charged and stand up.
Friction causes a transfer of electrons between the slide and you, making your like-charged hairs attract the air through induction.
The correct answer is: Friction causes a transfer of electrons between the slide and you, making your like-charged hairs repel each other.
Question
Which statement about electric insulators is true?(1 point)
Responses
Electric insulators are the best heat conductors.
Electric insulators are the best heat conductors.
Charges within electric insulators do not readily move.
Charges within electric insulators do not readily move.
Electric insulators have a high flow of heat and electricity.
Electric insulators have a high flow of heat and electricity.
Electric charges move freely in electric insulators.
The correct answer is: Charges within electric insulators do not readily move.
What electrical charges do two balloons have if they repel each other?(1 point)
Responses
negative and neutral
negative and neutral
Both are neutral in charge
Both are neutral in charge
positive and negative
positive and negative
positive and positive
The correct answer is: positive and negative.
A scientist wipes a rubber rod with a wool cloth which leads to a negative charge on the rod. After this, the scientist touches the rod to a neutral metal sphere. This will transfer the negative charges from the rod to the sphere:
Which statement explains what will happen to the negative charge, and why?
(1 point)
Responses
It will remain only on one spot of the sphere, because the low conductivity of the metal prevents the charges from spreading out.
It will remain only on one spot of the sphere, because the low conductivity of the metal prevents the charges from spreading out.
It will spread uniformly over the surface of the sphere, because of the conducting nature of the sphere and similar charges push away from each other.
It will spread uniformly over the surface of the sphere, because of the conducting nature of the sphere and similar charges push away from each other.
It will only spread to the air around the sphere, because negative charges need to occupy a big area.
It will only spread to the air around the sphere, because negative charges need to occupy a big area.
It will slowly move to the bottom of the sphere, because the charges are heavy and will sink to the bottom.
It will slowly move to the bottom of the sphere, because the charges are heavy and will sink to the bottom.