1. Magnetism

2. Silent Seven What are the three ways static electricity can occur?
What is the difference between current, voltage, and resistance? What are their units?
Draw an example of a parallel circuit
Draw an example of a series circuit

3. What is a magnet?
Any material that attracts iron and materials that contain iron (ferromagnetism)
Magnetism is the attraction or repulsion of magnetic materials
Can be made, changed, or broken apart

4. Magnetic poles Magnets have two ends
North points towards the north pole
South points towards the south pole

5. Magnetic Force
Attraction or repulsion between magnets that is produced when magnetic poles interact
A magnet must exert a magnetic force
Ex: how a maglev train moves

6. Attraction
When field lines curve towards each other it shows attraction.

7. Attraction Magnets are attracted to:
Other magnets (based on their poles)
Iron and materials made of iron
The North Star when swinging freely

8. Repulsion
Field lines that curve away from each other show repulsion.

9. Magnetic Field
Magnetic field lines start at a magnets north pole and end on the south pole.

10. Magnetic Field Lines Magnetic field lines strength depends on distance
Closer together where the field is strong
Further apart as the field gets weaker.
Fields are stronger at
the poles.

11. Combined Magnetic Fields
The magnetic field of one bar changes when another magnet is brought near it

12. Where do magnetic fields come from?
A moving electric charge, such as a moving electron, creates a magnetic field.

13. Inside every magnet are atoms with moving charges called electrons.
Not only do electrons swarm around the nucleus, they spin.

14. Because of the movement, each electron produces a magnetic field.
Atoms that make up magnets have their electrons arranged so that each atom is like a small magnet.

15. In some magnets, there’s a large amount of atoms that have their magnetic fields pointing in the same direction. Are these atoms lined up?

16. Magnetic Domain
When groups of atoms have their magnetic fields pointing in the same direction
Objects that are magnetic have a magnetic domain

17. Types of Magnetic Materials
Ferromagnetic
Behaves like iron in a magnetic field
Iron, nickel, cobalt, gadolinium, samarium, neodymium
Ferrite
Mixture of substances that contain ferromagnetic materials
This is why the screw was magnetic
Common magnets

18. Temporary Permanent Can be recharged to gain magnetism
Are not always magnetic
Ex: Iron nails and other items that are attracted to magnets
Permanent
Will always be magnetic
Lodestone
Magnetite

19. Demagnetize Breaking up the domain of a magnet
Physically
Increasing the temperature
You cannot separate the north and south poles, you can only change the strength of the force

20. Our magnetic Earth Molten material in our core is related to it
Compass: device that has a magnetic needle that spins freely
Turn to page 672.
Answer questions 1-3
Read the prompt
answer the questions
in your INB