Magnets – lesson 3 <ul><li>Target </li></ul><ul><li>To understand more about magnetic fields. </li></ul>Wednesday 16 Septe...
Homework answers <ul><li>The Pole Star- </li></ul><ul><li>This star is situated exactly above the north pole. When the Ear...
Homework answers <ul><li>The Southern Cross. </li></ul><ul><li>This is a prominent star formation, it can only be seen fro...
Homework answers <ul><li>The Southern Cross. </li></ul><ul><li>This star formation is also part of the Australian flag. </...
Homework answers <ul><li>True north- </li></ul><ul><li>This is the point on top of the Earth’s axis. The Earth spins aroun...
Homework answers <ul><li>Magnetic north- </li></ul><ul><li>This is the point near the actual north pole to which a compass...
Inducing magnetic fields <ul><li>If a magnet is placed near a piece of iron it will induce a magnetic field into the iron....
Repulsion test <ul><li>Repulsion is the only real test to see if something is a magnet because a magnet will attract – ano...
Quiz results Name Magnets quiz 1 Black Devil 6 Crazy Cop Guy 9 Cute Cat 9 Flying Horse 5 Kong Fu Skunk 8 Man 2 Merc 1 10 M...
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Magnets L3

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Magnets and electromagnets lesson 3

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Magnets L3

  1. 1. Magnets – lesson 3 <ul><li>Target </li></ul><ul><li>To understand more about magnetic fields. </li></ul>Wednesday 16 September 2009
  2. 2. Homework answers <ul><li>The Pole Star- </li></ul><ul><li>This star is situated exactly above the north pole. When the Earth spins on its axis the star does not appear to move in the sky- see picture. </li></ul>
  3. 3. Homework answers <ul><li>The Southern Cross. </li></ul><ul><li>This is a prominent star formation, it can only be seen from the southern hemisphere. </li></ul><ul><li>A line drawn through the pointers to the horizon will indicate due south. </li></ul>
  4. 4. Homework answers <ul><li>The Southern Cross. </li></ul><ul><li>This star formation is also part of the Australian flag. </li></ul><ul><li>One of the pointers (alpha centauri) is the 3 rd brightest star in the sky and is the closest star to Earth (4.37 light years away). </li></ul><ul><li>It is actually a double star. </li></ul>
  5. 5. Homework answers <ul><li>True north- </li></ul><ul><li>This is the point on top of the Earth’s axis. The Earth spins around this point. </li></ul><ul><li>Also called the geographic north pole. </li></ul>
  6. 6. Homework answers <ul><li>Magnetic north- </li></ul><ul><li>This is the point near the actual north pole to which a compass will point. </li></ul><ul><li>This point varies as time passes. </li></ul>
  7. 7. Inducing magnetic fields <ul><li>If a magnet is placed near a piece of iron it will induce a magnetic field into the iron. </li></ul><ul><li>The iron becomes a temporary magnet, with a north and south pole. </li></ul><ul><li>If steel is used it may become a permanent magnet. </li></ul>Before After
  8. 8. Repulsion test <ul><li>Repulsion is the only real test to see if something is a magnet because a magnet will attract – another magnet and/or an unmagnetised piece of iron or nickel. </li></ul>Homework – Hodder B – page 65 Answer all the questions and box.
  9. 9. Quiz results Name Magnets quiz 1 Black Devil 6 Crazy Cop Guy 9 Cute Cat 9 Flying Horse 5 Kong Fu Skunk 8 Man 2 Merc 1 10 Miley Cyrus 7 Monkey Boy 8 Purple Antelope 8 Teletubbies 6 Timothy Summer Surprise 7

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