# Magnets & Stuff - PowerPoint PPT Presentation

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Magnets & Stuff. http://www.sharenator.com/Real_life_Superheroes_10_People_with_Incredible_Abilities/#/a134_magnetic-2.html. Today’s Lesson. Magnetic Fields with Quick Class Demonstration Magnetic Domain Class Activity Temporary & Permanent Magnets Class Activity

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Magnets & Stuff

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Magnets & Stuff

http://www.sharenator.com/Real_life_Superheroes_10_People_with_Incredible_Abilities/#/a134_magnetic-2.html

### Today’s Lesson

• Magnetic Fields with Quick Class Demonstration

• Magnetic Domain

• Class Activity

• Temporary & Permanent Magnets

• Class Activity

• Introduction to Forces Activity

### Big Hint

• When going through a PPT with me, download it from the wiki and save it on your Hard Drive. If there is anything else that I say, write it in the notes. This way it is not lost.

### Magnetic Fields

• All magnets have a North and South Pole.

• This can be seen through a magnetic field, which we will quickly see.

• What do you think will happen to a compass if it is brought close to a magnet?

• What will happen to a compass if it’s in between the North and South Pole of a Magnet?

### Magnetic Domain

• All metals that are magnetic have a magnetic domain.

• If the atoms are not pointing in the same direction, then the metal will not b very magnetic.

• If most/all of the atoms point in the same direction, then it’s magnetic.

http://en.wikipedia.org/wiki/File:Dominios.png

### Small Activity

• In a group of 1 or 2, get a magnet, a nail and a paper clip.

• Hold the nail next to the paper clip to make sure it’s not magnetic. If it is, get a new nail.

• Your job is now to make a Magnet out of the nail. I’m not telling you how, but it is easy to do!!

• Try and get the nail to pick up as many paper clips as possible.

### Magnets In Detail

• In a magnetized material, all of most of the magnetic domains (direction of magnetism) are arranged in the same direction.

• A temporary magnet is a magnet that can easily lose it’s magnetism.

• A magnet that keeps it’s magnetism for a long time is called a permanent magnet.

• Permanent magnets can be destroyed through being heated or hit hard.

### Small Activity

• The class needs to get into 3 groups (6 or so students).

• Each group will need the following:

• 3 wires

• A power supply

• Magnetizer

• Switch

• Nail

• Very weak magnet with some paperclips

### Activity Continued

• Put the material together like described and drawn on the board.

• First, put the nail in the magnetizer for around 10 seconds (do this by turning on the switch.

• See how many paper clips it can pick up (is it stronger than the first magnet we made?

• Get the weak magnet and see how many paper clips it can pick up.

• Magnetize the magnet for 10 seconds and see how many paper clips it can pick up. Is it more or less?

### Forces Activity

• We will need to get into groups of 2 or 3 students. You will be working as a group for a couple of lessons so it will be important to choose partners that will do work!!