Name: ________________________________________

Notes: Magnetism

Three Properties of Magnets

1. Magnets have poles; a __________________________ pole and a __________________ pole.

2. Magnets exert ___________________________________; they can ____________________________________ other magnets.

3. Magnets have a magnetic _________________________ around them. This is the area where the _____________________acts.

Magnetic Field

______________________ magnets and exerts a _______________________ _________ other objects

Magnetic fields also have a __________________________________________.

The field lines are __________________ at the ________________ of the magnet -- the ________________________ - every magnet has a _______________________ and a _________________ pole

Oddly shaped magnets still have a north and a south.

The magnet above is a _________________________ magnet.

Magnets either attract or ___________________ each other.

__________________ poles are attracted to _____________________ poles.

For each set, indicate whether they ATTRACT or REPEL

Draw an arrow to show which way the magnets move.

How Does a Compass Work?

The needle of a compass ______________________ itself with the __________________ of the earth.

It always points _______________________________.

What would happen if you placed a magnet near a compass? Try it!

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Mini- Lab: Make your own compass.

Rub a magnet over a needle, the needle will become magnetized. Float this needle on water and it will point north.

Good Survival Skills!

How did it work for you? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Magnetic Domains = groups of________________________________ with aligned poles

Magnets can be_________________________ or ________________________________.

In your own words, write a definition for the word INDUCED.

____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

This nail has its atoms __________________________, but the effect is only ______________________________. You can get this effect by rubbing the nail on a magnet.

Neat fact: Hitting the nail can _______________________ it, you are basically __________________________________the atoms.

In 1820, Hans Christian Oersted discovered that a compass needle is affected by an _________________________________________________.

He went further to propose that the _______________________________ of the field changed with the direction of the_______________________________.

What is an ELECTROMAGNET?

A temporary magnet made by wrapping a_______________________ carrying a current around an ____________________ core.

Magnets Can be Used to Move Objects

When you turn_____________ the power, the magnet stops working (and you can drop the object)

Maglev Trains

Maglev vehicles “___________________” over an electromagnetically powered fixed steel track.

This eliminates ____________________________________ They are propelled by ______________________________________, and are quiet and

environmentally friendly. Take a look at: http://dsc.discovery.com/videos/extreme-engineering-season-1-shorts-

maglev-train.html

Properties of Electromagnets

1. _________________________________, only magnetic when there is a_________________

2. Strength is increased by adding more ____________________________ of wire

3. ______________________________other magnetic materials

4. When current is turned__________, the magnet may be attracted to other magnets.

**The movement can then be converted to_____________________________________ energy to do _______________________, such as spinning wheels.**

What is an electric motor?

Device that changes _________________________energy into ______________________ energy - causing something to move:

___________________________________ ___________________________________ ___________________________________ ___________________________________

Electric Motors - ______________________________

_____________________________________________________________________________

This motor runs a current through a wire. The wire is then attracted and then repelled by the magnet underneath - this will cause it to _____________________

Mini-Lab: How to Build a Simple Electric Motor

Resources:

https://www.youtube.com/watch?v=it_Z7NdKgmY https://www.youtube.com/watch?v=VhaYLnjkf1E

1. Drawing of design! Add labels:

2. Conclusion: How did your mini-Lab turn out? Explain how your simple electric motor works.

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

What is a GENERATOR?

Converts ____________________________ energy to _________________________________ energy. This is the ______________________________ of a motor!!!

You spin a wheel and it creates a current, which then powers a device.

Motors use ____________________________________________________________ _______________________________________________________________________.

Generators ______________________________________________________________ _______________________________________________________________________.

What is an MRI?

MRI - ______________________________________________________________________.

- uses _____________________ waves and a powerful ________________________________ to produce images of the body.

- remove all ____________________________ objects before entering the tube. Explain why? _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________