How do science concepts apply to your world? Here are some questions you'll be able to answer after you read this chapter.

• What causes two magnets to push and pull each other, even when they aren't touching?
• How do electric motors work?
• How do loudspeakers use magnets to change electrical signals into sound?
• How is electric current generated?
• How does electric current get to your home?
• How do doctors use magnetic fields to see inside the human body?

How Do Magnets Interact With One Another?

Procedure

1. Bring the north pole of one bar magnet close to the south pole of another bar magnet. Observe and record what happens.
2. Bring the north pole of one bar magnet close to the north pole of another bar magnet. Observe and record what happens.
3. Predicting   Predict what will happen if you bring the north pole of one bar magnet close to the center of another bar magnet. Test your prediction.

Think About It

1. Observing   Describe the similarities and differences between the interactions of the north and south poles and the two north poles.
2. Inferring   How do you think distance affects the way magnets interact?
3. Posing Questions   Write a question about how magnets interact with other materials, such as glass, plastic, paper, and cloth.