1. Magnetic Forces
Non-Contact Force

2. What are we going to learn today?
Characteristics of magnets.
Magnets can repel and attract each other
How magnets behave
What happens when you put two magnets together

3. What do all these new words actually mean?
Magnet
A stone or a piece of metal that attracts some other metal.
Iron, Nickel, Cobalt are metals that are magnetic
Attract
To pull towards each other.
Repel
To push away from each other.
Poles
The ends of a magnet.

4. What are the characteristics of magnets?
They can attract (pull) other materials.
They can also repel (push) from other magnets.
They are usually made of iron, cobalt, or nickel. Steel (paper clips) are also magnetic.
They have two ends called magnetic poles.

5. What do the poles do? When a magnet is held from a string:
The north pole points north
The south pole points… can you guess?
How do we know this?
We can measure it with a compass!
On school magnets, the RED pole is the north pole and the BLUE pole is the south.

6. But what happens if you put two magnets together?
Talk to your partner- what do you think?
So let’s try it.
First of all, north to south…
south to north…
north to north…
south to south…

7. All magnets have two poles

8. Two magnets with unlike poles facing will attract (pull towards) each other.

9. Two magnets with like poles facing will repel (push away) each other.

10. The pull of a magnet can be measured with a Newton (N) meter.

11. RECAP: “like” poles _______each other…
“opposite” poles ________ each other.
They do this because there is a FORCE between them.

12. Magnetic Field of our Earth:

13. Magnetic Field on Earth
Earth is surrounded by huge magnetic
NO scientific explanation
Iron, Nickel, liquid inside the core of Earth
Forces causes objects to line up with Earth’s magnetic field

14. MAGNETS AND MEGASTRUCTURES:
Can you think of any megastructures that use magnetic forces?