Magnetism

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Magnetism

  1. 1. Magnetism
  2. 2. Science Background : <ul><li>Earth itself is like a giant magnet. </li></ul><ul><li>The magnetic field of Earth extends about 50,000 miles out into space. </li></ul><ul><li>Earth has a north and south magnetic pole. </li></ul>
  3. 3. Compass : <ul><li>A compass’s needle is a magnetic. </li></ul><ul><li>The north pole of a compass, or any other magnet, is really a north-seeking pole. </li></ul><ul><li>Why do you think a compass might not work correctly in a large steel building or on a steel ship? </li></ul>
  4. 4. Answer: <ul><li>Magnets attract steel objects. The compass needle used inside a steel building or ship would be affected by the closet steel object and not necessarily point in a northerly direction. </li></ul>
  5. 5. Warm-Up Activity: <ul><li>Spread some paper clips on a table. </li></ul><ul><li>Lower a bar magnet over the paper clips. </li></ul><ul><li>Where do most of the paper clips stick to on the magnet. WHY? </li></ul>
  6. 6. Identifying A Magnetic Field: <ul><li>A magnetic field surrounds all magnets. </li></ul><ul><li>Magnetic Field : An area around a magnet in which magnetic forces can act. The magnetic forces will attract or repel other magnets. </li></ul>
  7. 7. Magnetic Field …(p. 351) <ul><li>You cannot see magnetic fields, but you can see their effects. </li></ul><ul><li>Lines of Force : Lines that show a magnetic field. </li></ul><ul><li>Lines of force are caused by the magnetic field and show the field. </li></ul><ul><li>The lines of force reach around the magnet from one pole to another. </li></ul><ul><li>The lines are closet together near the poles. Where the field is the strongest and the forces are greatest. </li></ul>
  8. 8. The Earth as a Magnet : <ul><li>The Earth itself is a giant bar magnet. </li></ul><ul><li>The Earth’s magnetic poles are located near the geographic north and south poles. </li></ul><ul><li>The Earth’s magnetism allows compasses to work. </li></ul>
  9. 9. Earth As a Magnet Continued … <ul><li>Page. 352 </li></ul><ul><li>The north magnetic pole of Earth attracts the north pole of a compass. </li></ul><ul><li>This happens because Earth’s north magnetic pole is actually like the south pole of a magnet. </li></ul><ul><li>It is called the north magnetic pole because it is located near the geographic North Pole. </li></ul>
  10. 10. Lesson 2 Review: <ul><li>1.) What is a magnetic field? </li></ul><ul><li>2.) What pattern is made by magnetic lines of force around a bar magnet? </li></ul><ul><li>3.) How does a compass work? </li></ul><ul><li>4.) Where are magnetic lines of force closest? </li></ul>

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