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Magnetism Grade 5 Assessed Skills: Explore and describe uses of magnets Identify the poles of a magnet Identify the description of a magnetic field Magnets A magnet will pull some metals towards itself.

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magnetism

Magnetism

Grade 5 Assessed Skills:

Explore and describe uses of magnets

Identify the poles of a magnet

Identify the description of a magnetic field

magnets
Magnets
  • A magnet will pull some metals towards itself.
  • Metals that contain iron, nickel, and cobalt are magnetic. In other words, a magnet will pull them.
we use magnets in many ways

We use magnets in many ways!

Which of the following items in a home use a magnet?

Blender washer dryer

Radio can opener dishwasher

Refrigerator doorbell compass

Click here to find out! (select kitchen on the left of the screen, close window to return to this presentation) http://www.fossweb.com/modules3-6/MagnetismandElectricity/index.html

uses of magnets
Uses of magnets
  • Magnets were first put to use in navigation because they always point north and south.
  • Magnets are used to hold, separate, control, convey and elevate products and to convert electrical energy into mechanical energy or convert mechanical energy into electrical energy.
magnets around the house
Magnets around the House:

Headphones Refrigerator magnets Computer speakers Telephone receiversPhone ringers Microwave tubesSeal around refrigerator door

Plug-in battery eliminatorsFloppy disk recording and reading headAudio tape recording and playback headVideo tape recording and playback headCredit card magnetic strip TV deflection coilComputer monitor Computer hard drive Shower curtain weights / attach to tubPower supply transformers

magnets inside of motors
Magnets inside of motors:

CD and DVD spinner and head positioner

Audio and VHS tape transport

VHS tape loader Microwave stirring fans

Kitchen exhaust fans Garbage disposal motor

Sump pump Furnace blower and exhaust   

Garage door opener Bathroom exhaust fan

Electric toothbrush Ceiling fan

Pager or cell phone vibrator

Clocks (not the wind-up type or LCD type)

Computers

magnets in your car
Magnets in your Car:

Starter motor

A/C clutch

Interior fan motor

Electric door locks

Windshield wiper motor

Electric window motor

Side-view mirror adjuster motor

CD/tape player motor and playback

Engine speed sensors

Alternator

Starter relay

Windshield washer pump motor

magnets have poles
Magnets have Poles

Just like the Earth has a North and South Pole, magnets also have two poles.

If you take a bar magnet and hang it from a string, the end that points north is the magnets North Pole, and the end that hangs south is the South Pole.

This is because the Earth is actually a HUGE magnet itself!

Similar magnetic poles repel, while opposite magnetic poles attract.

magnets also have a magnetic field
Magnets also have a Magnetic Field
  • Every magnet has a magnetic field around it. It can be thought of as a line of force running from the north end of the magnet to the south end of a magnet.
  • Earth’s magnetic field is what causes the needle of a compass to point north and south.
the following links can help you learn more about magnets
The following links can help you learn more about magnets:
  • http://www.bbc.co.uk/schools/revisewise/science/physical/12_fact.shtml click next after reading the facts to take a quiz!
  • Complete this activity to explore magnetic fields http://www.galaxy.net/~k12/electric/fields.shtml
  • Ten facts about magnets:

http://tm.wc.ask.com/r?t=c&s=a&id=30780&sv=za5cb0dc7&uid=2d0b7690bd0b7690b&sid=3d0b7690bd0b7690b&p=%2flinks&o=0&u=http://www.execpc.com/~rhoadley/magbasic.htm