<ul><li>Target:  </li></ul><ul><li>to know about magnetic materials and about the properties of magnetic poles. </li></ul>...
Material Prediction Observation
Electromagnetism : Magnetic? Which of the metals below are  magnetic  metals? Aluminium(Al) Silver (Ag) Iron (Fe) Gold (Au...
Electromagnetism : Magnetic? Only Iron [Fe], Nickel [Ni] and Cobalt [Co] are. Al Zn Ag Cu Au Mg N  S Fe Ni Co
<ul><li>Not all metals are magnetic </li></ul><ul><ul><li>Iron, cobalt, nickel and steel are magnetic </li></ul></ul><ul><...
1 2 3 Attract Repel Repel
<ul><li>A magnet has 2 ends called poles </li></ul><ul><li>They are known as North and South </li></ul><ul><ul><li>They li...
<ul><li>Magnets are made of either iron, nickel or cobalt </li></ul><ul><li>Only a magnet will be repelled by another magn...
<ul><li>A compass needle is a small magnet with a North pole, N, and a South pole, S. </li></ul><ul><li>Ruth placed two co...
<ul><li>(a) Joan placed a bar magnet with its  South pole  between the two compasses. The compass needles moved as shown b...
<ul><li>(b) Joan turned the bar magnet round so that the  North pole  was between the two compasses. </li></ul><ul><li>On ...
<ul><li>(c) Joan repeated her experiment with an aluminium bar instead of a bar magnet. </li></ul><ul><li>What happened to...
<ul><li>(a) Ann put a paper cup into a glass beaker. She glued a magnet in the bottom of the paper cup. She glued another ...
<ul><li>What  two  forces act on the paper cup and its contents to keep it in this position? </li></ul><ul><li>1. ...........
<ul><li>(b) Ann put 5 g of aluminium rivets into the paper cup. It moved down a little as shown in diagram B. </li></ul>
<ul><li>Ann plotted a graph to show how the mass of aluminium rivets affected the distance the cup moved down. </li></ul>
<ul><li>(i) Use the graph to find the mass that made the cup move down 4 mm.......... g </li></ul><ul><li>(ii) Why did the...
<ul><li>(c) Ann removed the 5 g of aluminium rivets and put 5 g of iron nails into the cup.   </li></ul>
<ul><li>The paper cup moved down more with 5 g of iron nails than with 5 g of aluminium rivets as shown in diagram C. Give...
<ul><li>1. What is the ‘Pole Star’? </li></ul><ul><li>2. What is ‘True North’? </li></ul><ul><li>3. What is ‘Magnetic Nort...
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Magnets and electromagnets - lesson 1

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Magnets and electromagnets lesson 1 year 8

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Magnets and electromagnets - lesson 1

  1. 1. <ul><li>Target: </li></ul><ul><li>to know about magnetic materials and about the properties of magnetic poles. </li></ul>Friday 28 August 2009 Lesson 1
  2. 2. Material Prediction Observation
  3. 3. Electromagnetism : Magnetic? Which of the metals below are magnetic metals? Aluminium(Al) Silver (Ag) Iron (Fe) Gold (Au) Nickel (Ni) Cobalt (Co) Copper (Cu) Zinc(Zn) Magnesium (Mg)
  4. 4. Electromagnetism : Magnetic? Only Iron [Fe], Nickel [Ni] and Cobalt [Co] are. Al Zn Ag Cu Au Mg N S Fe Ni Co
  5. 5. <ul><li>Not all metals are magnetic </li></ul><ul><ul><li>Iron, cobalt, nickel and steel are magnetic </li></ul></ul><ul><li>Non magnetic materials include; </li></ul><ul><ul><li>Copper, Aluminium, Magnesium </li></ul></ul><ul><ul><li>All non metals </li></ul></ul>Key points
  6. 6. 1 2 3 Attract Repel Repel
  7. 7. <ul><li>A magnet has 2 ends called poles </li></ul><ul><li>They are known as North and South </li></ul><ul><ul><li>They line up with the Earth’s magnetic field </li></ul></ul><ul><li>Like poles repel and unlike poles attract </li></ul>
  8. 8. <ul><li>Magnets are made of either iron, nickel or cobalt </li></ul><ul><li>Only a magnet will be repelled by another magnet </li></ul><ul><li>Non magnetic objects are neither repelled or attracted to magnets </li></ul>Key points
  9. 9. <ul><li>A compass needle is a small magnet with a North pole, N, and a South pole, S. </li></ul><ul><li>Ruth placed two compasses onto a piece of card. Both compass needles pointed in the direction shown below. </li></ul>
  10. 10. <ul><li>(a) Joan placed a bar magnet with its South pole between the two compasses. The compass needles moved as shown below. </li></ul><ul><li>On the diagram below , label the North pole and South pole of each compass needle. Use the letters N and S. </li></ul>
  11. 11. <ul><li>(b) Joan turned the bar magnet round so that the North pole was between the two compasses. </li></ul><ul><li>On the diagram below , label the North pole and South pole of each compass needle now. Use the letters N and S. </li></ul>
  12. 12. <ul><li>(c) Joan repeated her experiment with an aluminium bar instead of a bar magnet. </li></ul><ul><li>What happened to the compass needles? </li></ul><ul><li>..................................................................................................................... </li></ul>
  13. 13. <ul><li>(a) Ann put a paper cup into a glass beaker. She glued a magnet in the bottom of the paper cup. She glued another magnet in the bottom of the beaker. The magnets repelled. </li></ul>
  14. 14. <ul><li>What two forces act on the paper cup and its contents to keep it in this position? </li></ul><ul><li>1. ........................................................... </li></ul><ul><li>2. ........................................................... </li></ul>
  15. 15. <ul><li>(b) Ann put 5 g of aluminium rivets into the paper cup. It moved down a little as shown in diagram B. </li></ul>
  16. 16. <ul><li>Ann plotted a graph to show how the mass of aluminium rivets affected the distance the cup moved down. </li></ul>
  17. 17. <ul><li>(i) Use the graph to find the mass that made the cup move down 4 mm.......... g </li></ul><ul><li>(ii) Why did the graph stay flat with masses greater than 40g? </li></ul>
  18. 18. <ul><li>(c) Ann removed the 5 g of aluminium rivets and put 5 g of iron nails into the cup. </li></ul>
  19. 19. <ul><li>The paper cup moved down more with 5 g of iron nails than with 5 g of aluminium rivets as shown in diagram C. Give the reason for this. </li></ul><ul><li>..................................................................................................................... </li></ul><ul><li>..................................................................................................................... </li></ul>
  20. 20. <ul><li>1. What is the ‘Pole Star’? </li></ul><ul><li>2. What is ‘True North’? </li></ul><ul><li>3. What is ‘Magnetic North’? </li></ul><ul><li>4. What is the ‘Southern Cross’? </li></ul><ul><li>5. Where does the word ‘news’ come from? </li></ul>

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