Agenda 5/18 Circular Motion Warm-Up Hand back GA Packets Demo: Disney Mythbusters Notes: Magnets...

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Agenda 5/18 Circular Motion Warm-Up Hand back GA Packets Demo: Disney Mythbusters Notes: Magnets Conclusion: In-class Mythbusters

Transcript of Agenda 5/18 Circular Motion Warm-Up Hand back GA Packets Demo: Disney Mythbusters Notes: Magnets...

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Agenda 5/18

• Circular Motion Warm-Up• Hand back GA Packets

• Demo: Disney Mythbusters• Notes: Magnets

• Conclusion: In-class Mythbusters

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It this really possible?

• Could Pluto swallow a magnet and still be able to pick up all kinds of metal things?

• What do you think?

• Why or why not?

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Magnetism

• The physics behind magnets parallel the physics behind charge very well.

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Electric Charges vs Magnets

• Positive & negative charges

• Like charges repel• Opposite charges

attract• Electric Fields

surround electric charges

• Can isolate a charge

• North (seeking) & south (seeking) poles• Like poles repel• Opposite poles attract• Magnetic fields surround magnets• Cannot isolate a pole

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Different Types of Magnets

• Magnets come in many shapes and sizes. (bar magnets, circular magnets, horseshoe, etc.)

• No matter what the shape or size every magnet must have a north and south pole.

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What happens if you break a magnet in half?

• If you break a magnet in half, each side will still have a north pole and a south pole.

• If you continued breaking the magnet into smaller and smaller pieces every piece will have a north pole and a south pole.

N S N S N SNS

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More on Breaking Magnets

• This picture further shows what happens when a magnet gets broken in half.

• Breaking magnets can be purchased but we believe it works better to “fake” it.

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Agenda 5/19/15

• Warm-Up• Finish Notes: Magnetism

• Electromagnets Activity– Paper clip activity

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Magnetic Domains• This diagram represents an

unmagnetized iron nail. The arrows represent the alignments of the magnetic domains. These domains are not aligned.

• This diagram represents a bar magnet. The domains in the magnet are aligned.

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How Does Something Become Magnetized?

• If you touch the nail to the bar magnet, the nail becomes magnetized.

• This is because the domains in the nail will now align.• If you remove the nail, the domains fall back out of

alignment and the nail loses its magnetism.

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Magnetic Fields

• A magnetic field can be thought of as a field that shows magnetic force lines.

• You can easily show the magnetic field with iron filings and a magnet. The iron filings will line up with the magnetic field.

• Out of the South into the North

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The Earth’s Magnetic Field

• The north pole of a compass seeks north because is aligns with the Earth’s magnetic field.

• What gets a bit confusing is the magnetic south is in the geographic north and vice versa.

• Scientists believe that the Earth’s magnetic field comes from convection currents in the liquid outer core.

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Agenda 5/20/15

• Warm-Up

• Breakdown Electromagnets– Demo Electromagnets

• Complete Magnetic Fields

• 2nd Period: Research for Mouse Trap Car

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Electromagnets

• Benefits:– Can be turned on and off by switch– Can be adjusted depending on use of magnet

• Drawbacks:– Must have a current supply– Potential for dangerous situations

• Fires, shorted circuits

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Electromagnet Applications

• Motors

• Crane

• Projectiles

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Magnetic Field Lines

• Which direction do the run??

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Bar Magnet

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Horseshoe Magnet

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Ring Magnet

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Problems

N S

S N

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Problems

N S

N S

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Agenda 5/22

• Two Tasks Today:

1. Complete the construction of your mousetrap car

2. Complete your semester 2 review guide– Cheat Sheet/Formula Sheet Allowed