By: Dana A, Robin B. & Tatyana P.

Are these items magnetic or not?Out of the few items below, can you place the items in the correct box.

Magnetic Nonmagnetic

If you grouped these objects If you grouped these objects this way, then you are correct.this way, then you are correct.

Magnetic Nonmagnetic

At the end of the slide show, you will understand why some items are magnetic and are non-magnetic.

What is magnetism?What is magnetism?

Magnetism is the invisible force , Magnetism is the invisible force , which means that you cannot see it which means that you cannot see it happening. Why? Because it is happening. Why? Because it is invisible.invisible.

Can you see the magnet pulling the Can you see the magnet pulling the nail?nail?

What is a magnet?What is a magnet?

A magnet is a piece of metal that can A magnet is a piece of metal that can attract another piece of metal.attract another piece of metal.

What do magnets look like?What do magnets look like?

Magnets can be almost any shapeMagnets can be almost any shape..

Horseshoe

Doughnut or ring magnetBar magnet

Refrigerator magnets

Disk Magnet

Why do magnets Why do magnets attractattract or or repel repel objects?objects?

ATTRACT

REPEL

*Items that contain metals such as iron, cobalt, steel and nickel are magnetic and are therefore, attracted to magnets.

Pushes away object

Pull towards object

Are some of the foods we eat Are some of the foods we eat magnetic?magnetic?

Which breakfast food do you think Which breakfast food do you think contains the most iron?contains the most iron?

a. A bagel with butter

b. Waffles and syrup

c. Total breakfast cereal with milk

If you guessed C, you are If you guessed C, you are correctcorrect..

-Many breakfast Cereals contain iron which -Many breakfast Cereals contain iron which means that it is magnetic.means that it is magnetic.

-Try the experiment on the next page to see which of your favorite cereal contain iron.

-1 Cup iron-fortified cereal (Total) -2 Cups hot water-Deep mixing bowl or glass-Spoon-White Magnet (or painted white)

1.Place the magnet in the bowl.

2. Pour 1 cup iron-fortified cereal, such as "Total," into the mixing bowl.

3.Add 2 cups of hot water.

4. Stir the water and cereal for at least ten minutes. (Thirty minutes will give the maximum iron recovery.)

5. Carefully take the magnet out of the bowl.

6. The black residue left on the white

magnet is iron.

Experiment: Is my breakfast food magnetic?

PROCEDUREMATERIALS

The Poles of A MagnetThe Poles of A Magnet

There are two poles of a magnet.There are two poles of a magnet. They are North and South. The north pole They are North and South. The north pole

is the strongest.is the strongest.

North South

How is Earth a magnetHow is Earth a magnet??

Earth has a north magnetic pole and Earth has a north magnetic pole and a south magnetic pole. It also has a south magnetic pole. It also has an invisible magnetic field.an invisible magnetic field.

The Earth’s core is made up of solid The Earth’s core is made up of solid iron and hot liquid iron.iron and hot liquid iron.

The iron moves around as the Earth The iron moves around as the Earth rotates.rotates.

Earth’s magnetic field is called the Earth’s magnetic field is called the magnetosphere.magnetosphere.

What is a compass?What is a compass?

-A magnet that is free to swing around. It always point to the magnetic poles.

-Many years ago, sailors used a compass to find their way at sea, today many people use navigation systems to help find their way..

-A device used to determine geographic direction (such as North, South, East and West) usually consisting of a magnetic needle.

What is a magnetic field?What is a magnetic field?

Earth’s magnetic field

-The lines of force surrounding a permanent magnet or a moving charged particle. These lines of force are invisible.

Do the lines of force look the same? What’s different about them?

Do all magnets carry the same Do all magnets carry the same strength?strength?

-No, some magnets are stronger than others.

-A horseshoe magnet may be the strongest out of the three magnet above because the poles of the magnets are close together.

-When the poles of the magnets are close together, it makes the magnet more powerful than if they were farther apart.

Can the magnets act Can the magnets act through solids, liquids and through solids, liquids and

gases?gases?

Gases

Liquids Paper clip in a half jar of water

Paper clip with a sheet of paper over it

Paper clip

Solids

Is the object still magnetic?

YES

YES

YES

How important is magnetism in How important is magnetism in our everyday livesour everyday lives??

The edge of the refrigerator door is lined with a magnet. It holds the door to the metal frame.

Floppy disks are made of plastic and coated in magnetic particles. Floppy disks are used to save and retrieve information.

Compasses help people use the earths magnetic force to find their way.

Doorbells use magnets too. The magnet pulls the hammer forward to strike the bell. Ding dong!

Credit cards. The thin, black bar on the back is coated with tiny magnets. It holds information.

There are tiny magnets inside a stereo, telephone, vacuum cleaner and washing machine.

Check out these links to learn more about magnetism.Check out these links to learn more about magnetism.

www.engineringinteract.org.

http://www.bbc.co.uk/schools/scienceclips/

http:/www.quia.com/rr/42166.html

http://www.ndt-ed.org/EducationResources/HighSchool/Magnetism/hs_mag_index.htm

http://www.tooter4kids.com/Magnets/fun_facts.htm

http://ksnn.larc.nasa.gov/k2/s_magnetsWork_v.html

http://home.interserv.com/~skyblade/charges.htm

Explore the Filamentality Website to learn more about magnetism.

http://www.kn.att.com/wired/fil/pages/listmagneticda.html

Take this quiz after you have Take this quiz after you have navigated through each of the navigated through each of the

websites.websites.

1. Will the South Pole and North Pole attract or repel?2. The area around a magnet that behaves like a magnet is

a magnetic_____.3. Which pole is the strongest?4. Would a magnet will most like attract a plastic bottle or a

screw?5. Two north poles will________.6. What is the name of the particles everything around us is

made up of?7. Name a breakfast food that is considered to be

magnetic.8. An example of a metal that is magnetic is called_______.9. Which pole is the strongest?10. The biggest magnet in the world is ________.11. The earth’s magnetic field is called the ______________.12. What tool is used to find directions?