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Magnetic or Nonmagnetic?

Magnetic or Nonmagnetic?. First some review…. All matter has measurable physical properties. Those properties determine how matter is classified, changed, and used. Magnetism is one physical property of matter. . What is Magnetism?. Magnetism is a force of attraction or repulsion

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Magnetic or Nonmagnetic?

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  1. Magnetic or Nonmagnetic?

  2. First some review… • All matter has measurable physical properties. • Those properties determine how matter is classified, changed, and used. • Magnetism is one physical property of matter.

  3. What is Magnetism? • Magnetism is a force of attraction or repulsion • The force of attraction pulls an object towards the magnet. • The force of repulsion pushes an object away from the magnet.

  4. Magnets are the tools used to measure magnetism • poles – two ends of a magnet • every magnet has two poles • north (N) pole • south (S) pole • even if you break a magnet in half, each half will have a north pole and a south pole

  5. Remember • Unlike poles attract • Like poles repel • But, that only when talking about two magnets.

  6. Properties of Magnets • Why do these magnets appear to “float” in air? The same poles are facing each other. S N N S S N

  7. What matter is Magnetic? • Metals that contain iron, nickel, and cobalt are magnetic. In other words, a magnet will pull them. • Not all metals are magnetic. • Aluminum and copper are examples of metals that are NOT magnetic.

  8. What is the ONLY way to tell if an object is magnetic? Use a magnet.

  9. Magnetite is a special rock that is magnetic. Why are these nails attracted to the magnetite? They are made of iron.

  10. 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.

  11. Magnetic Field Lines Field lines come together where the magnetic force is strong, and spread out where it is weak. In a bar magnet, force field lines spread out from one pole and come together towards the other. The magnetic force is strongest near the poles where they come together.

  12. Now that you know more about magnetism, let’s see if you can find the magnetic items.

  13. Magnetic or non-magnetic? Cobalt drill bits Magnetic

  14. Magnetic or non-magnetic? Not Magnetic Pennies are made of copper and copper is NOT magnetic. penny

  15. Magnetic or non-magnetic? Not Magnetic. Remember only iron, nickel, and cobalt are magnetic metals. aluminum

  16. Magnetic or non-magnetic? Not Magnetic Porcelain vase

  17. Magnetic or non-magnetic? Iron filings Magnetic

  18. Magnetic or non-magnetic? Copper wire Not Magnetic

  19. Magnetic or non-magnetic? NOT Magnetic Silver is Not one of the magnetic metals. Silver spoon

  20. Magnetic or non-magnetic? wood Not Magnetic

  21. Magnetic or non-magnetic? Magnetic Iron nails

  22. Magnetic or non-magnetic? Magnetic FACT: The nickels made in the United States are not made of nickel – they are made of copper so they are not magnetic. Nickel coins from Denmark

  23. Magnetic or non-magnetic? Paper clips Trick question – since you don’t know if these paper clips are aluminum or iron, you don’t know if they are magnetic until you put them near a magnet.

  24. Talk with your group • What are the three metals that are magnetic? • What are two things you know about the poles of a magnet?

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