Question

1. what happened to the sweater? how did it get charged?

1. bring the balloon in the middle, between the sweater and the wall. what happens to the balloon when you let it go? explain.

1. what is the overall charge of the wall?

1. what do you think will happen when the balloon is brought close to the wall? predict first.

1. what happens to the negative charges in the wall when you move the balloon near it?

1. what happens to the positive charges in the wall when you move the balloon near it?

Explanation:

Analyze the sweater's charge and mechanism

• The sweater loses electrons to the balloon when rubbed.
• It becomes positively charged through charging by friction (triboelectric effect).

Analyze the balloon's behavior in the middle

• The balloon is negatively charged after rubbing against the sweater.
• When placed in the middle, it is attracted back to the positively charged sweater and moves toward it.

Determine the wall's overall charge and interaction

• The wall is initially neutral (overall charge is zero).
• When the negatively charged balloon approaches, it repels the mobile negative charges (electrons) in the wall, causing local polarization while positive charges remain stationary.

Answer:

Question 5

What happened to the sweater? How did it get charged?
<blank>The sweater lost electrons and became positively charged. It got charged through charging by friction (the triboelectric effect) when rubbed by the balloon.</blank>

Question 6

Bring the balloon in the middle, between the sweater and the wall. What happens to the balloon when you let it go? Explain.
<blank>The balloon flies back toward the sweater. This happens because the negatively charged balloon is attracted to the positively charged sweater (opposite charges attract).</blank>

Question 7

What is the overall charge of the wall?
<blank>The overall charge of the wall is neutral (zero net charge).</blank>

Question 8

What do you think will happen when the balloon is brought close to the wall? Predict first.
<blank>The balloon will be attracted to and stick to the wall.</blank>

Question 9

What happens to the negative charges in the wall when you move the balloon near it?
<blank>The negative charges (electrons) in the wall are repelled by the negatively charged balloon and move away from the surface, leaving a local positive charge.</blank>

Question 10

What happens to the positive charges in the wall when you move the balloon near it?
<blank>The positive charges (protons in the nuclei) do not move because they are bound within the atomic structure of the wall.</blank>