1.
Write down something you know about magnets or magnetism, and how you know it. Where do you use magnets in your everyday life?
Section 11.1 What Is Magnetism?
Exercises Warm-up Activities
Magnets interact in lots of interesting ways with different types of materials. We will discuss mainly permanent magnets and ferromagnetic objects.
Definition 11.1.1. Permanent magnets.
Permanent magnets are objects that have both attractive and repulsive interactions with each other. These objects have a ``north" and a ``south" pole that react to each other in different ways. Like poles repel and opposite poles attract.
Definition 11.1.2. Ferromagnetic magnets.
Ferromagnetic materials (like iron, cobalt, and nickel) tend to be attracted to permanent magnets 1 .
Exercises Activities
The experiments below will help answer some of the model questions posed in the video above.
1.
Make a prediction about what you think happens if you cut a magnet in half. Then watch the following video in the answer to check your prediction.
2.
Make a prediction about what you think happens if you bring a magnet near a grape. Then watch the following video in the answer to check your prediction.
References References
[1]
"Magnetism: Cutting a magnet in half" YouTube, uploaded by QM Oxford, February, 18, 2019, https://www.youtube.com/watch?v=q0d_SS-0Puk&t=331s&ab_channel=QMOxford
[2]
"magnetic grapes" YouTube, uploaded by Mark Lorch, March 24, 2012, https://www.youtube.com/watch?v=-zOzEvHmaK8
ferromagmetic materials can become permanent magnets through a process known as magnetization
