What Our Lives Would Be Like without Magnets

1
What Our Lives Would Be Like without Magnets

• Their influence in our lives and the world

2
What is a magnet?

• A material or object that produces a magnet field
• is due to the motion of electric charge
• Plate tectonics explain the large scale motions
  of the Earth's lithosphere, causing magnetic
  rocks to exist.

3
What do you know about magnets?

• Use in everyday life
• Attract objects
• Most have two poles
• Have a space around them called magnetic field

4
Where do they come from?

• Nature
• Man-made

5
Things that need magnets

• Headphones
• Stereo speakers
• Computer
• Telephone receivers
• Phone ringers
• Doorbell ringers
• Seal around refrigerator doors
• Credit card magnetic strip

• Television coils
• Computer hard drive
• CD and DVD spinner
• Dishwashers
• Refrigerators
• Fans
• Cell phones
• Starter motor of cars
• And many more

6
Types of Magnets

• Magnetic metallic elements (more common)
• Iron ores, cobalt, and nickel
• Composites (common)
• Powder iron and ceramic
• Aluminum and other materials
• Resin and magnetic powder
• Others

7
What do you want to know about magnets?

• Think about magnets
• Develop an idea
• Write down questions
• Make list
• Discuss ideas with partner
• Present to class

8
Where to learn about magnets

• In books
• On the web
• Manipulating magnets
• Thinking about things that require magnets
• Searching for objects that need magnets

9
Where do we go from here?

• Make our own magnets
• Develop activities involving magnets
• Educate friends
• Discuss about the world in relation to magnets

10
Bibliography

• NASAs KSNN - why do magnets work
  http//ksnn.larc.nasa.gov/k2/videos/s_magnetsWork
  _H.html
• ISIS Data Analysis http//www.isis.rl.ac.uk/DataA
  nalysis/e-science/2004_povs/2004_povs.html
• Wikipedia http//en.wikipedia.org/wiki/Magnet
• KidsKonnect http//www.kidskonnect.com/content/vi
  ew/90/27/