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Magnets PowerPoint Presentation

Magnets

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Magnets

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Presentation Transcript

  1. Magnets Investigation 1 Review

  2. Stuck on Magnets • Magnets stick to some metals, but not all metals. • Magnets stick only to items that are steel or iron. • Magnets do not stick to aluminum.

  3. Forces: Attract and Repel Opposite poles of a magnet attract, or pull together, as seen in the top magnets in the picture. Like poles of a magnet repel, or push apart, such as the magnets at the bottom of the picture.

  4. Magnetic Detectors • Compasses can be used as detectors because the needle of the compass will always point toward the magnet’s force. • Other good detectors are iron filings, metal screens, and paper clips.

  5. Induced Magnetism • When magnetic force travels from a magnet through a metal item, the metal item can become a temporary magnet as long as it continues to touch the magnet. • The nail below is a temporary magnet.

  6. Breaking the Force • As the distance between two magnets increases, the force of magnetism decreases, and it is easier to break the force. • The force is much stronger when the magnets are close together.

  7. Time for a QUIZ! • Which of these items will NOT stick to a magnet? • Steel nail • Paper clip • Aluminum foil • Penny • A and B • C and D

  8. FA magnet does not stick to materials that don’t have steel or iron in them, such as a penny or aluminum foil.

  9. If two magnets are placed end to end with the same poles touching…. • The magnets will attract. • The magnets will repel.

  10. BLike poles will repel each other.

  11. Which of these items would NOT be a good detector? • Penny • Compass • Iron Filings • Paper Clip

  12. AA penny does not have iron or steel in it, so it could not detect a magnet.

  13. Why does the paper clip stick to the nail? • Force of Repulsion • Force of Attraction • Magnetic Field • Induced Magnetism

  14. DInduced magnetism can create temporary magnets from items with steel or iron, as long as the item remains in contact with the magnet.

  15. Breaking the Force • What happens to the force of magnetism as the distance between two magnets increases? • The force gets stronger. • The force gets weaker. • Nothing happens to the force.

  16. BThe force is weaker when there is a greater distance between the magnets.

  17. May the “force” be with you. 