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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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Disney Mythbuster
• https://www.youtube.com/watch?v=HFrCkt60A9w
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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