1. Magnetism

2. Standard: S8P5c. Investigate and explain that electric currents and magnets can exert force on each other.
Instructional Approach(s): The teacher should introduce the essential question and the standard that aligns to the essential question

3. A magnet is any material that attracts iron or materials containing iron.
Students should define magnet on their notes sheet.

4. Properties of Magnets All magnets have two poles
Magnets exert forces on each other
Magnets are surrounded by a magnetic field
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

5. 4. Magnets are surrounded by a Magnetic Field
Magnetic field lines show both the direction and the strength of a bar’s magnetic field
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

6. Magnets are surrounded by a Magnetic Field
The closer together the lines, the stronger the field
The lines around a magnet are closest together at the poles, because the magnetic force is strongest
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

7. Field lines that curve toward each other show attraction.
Opposites Attract
Field lines that curve toward each other show attraction.
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

8. Field lines that curve away from each other show repulsion.
Likes Repel
Field lines that curve away from each other show repulsion.
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

9. Magnetic Fields
-projects/discoveries/magnetic-fields/p/magnet- and-iron-filings
Instructional Approach(s): The teacher should present the link on the slide to reinforce magnetic fields

10. 5. Whether a material is magnetic depends on the material’s atoms
The Cause of Magnetism
5. Whether a material is magnetic depends on the material’s atoms
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

11. The Cause of Magnetism
As electrons in atoms move around, a magnetic field is generated.
The atom will then have a north and south pole.
The atoms group together in areas called domains, which are like tiny magnets.
In most materials, the magnetic fields cancel each other out because the domains are randomly oriented (as shown below)
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

12. The Cause of Magnetism
In materials such as iron, nickel, and cobalt, the north and south poles of the atoms in a domain line up and make a strong magnetic field (as shown in the diagram below)
The arrangement of domains in an object determines whether the object is magnetic
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

13. The Cause of Magnetism
Instructional Approach(s): The teacher should present the illustration on the slide to provide an example of magnetized and demagnetized domains

14. If the arrangement of domains in an object determines whether the object is magnetic, is there a way to demagnetize an object? If so, how?
Instructional Approach(s): The teacher should present the information on the slide to introduce magnets demagnetized

15. Losing Alignment The domains of a magnet may not always stay lined up
When domains move, the magnet is demagnetized, or loses it magnetic properties
What are some ways you think a magnet might be demagnetized?
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

16. Ways to demagnetize (move domains)
Losing Alignment
Ways to demagnetize (move domains)
Dropping a magnet or hitting it too hard
Putting the magnet in a strong magnetic field that is opposite to its own
Increasing the temperature of a magnet (in higher temperatures, atoms vibrate faster so they may no longer line up)
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes

17. Making Magnets
You can make a magnet from something made of iron, cobalt, or nickel. You just need to line up the domains.
You can magnetize an iron nail by dragging a magnet down it many times (in one direction)
The domains in the nail line up with the magnetic field of the magnet. So, the domains in the nail become aligned.
As more domains line up, the magnetic field grows stronger.
Instructional Approach(s): The teacher should present the information on the slide while the students record the important information on their notes