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# Investigating magnetism

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DSVS, 8th Grade, Lab 1, Magnetism

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### Investigating magnetism

1. 1. Investigating Magnetism<br />DSVS Spring 2011<br />Eighth Grade<br />Lab 1<br />
2. 2. Introduction<br />Introduce yourself<br />Explain what DSVS is and what it aims to do<br />Spend time engaging the students in conversation about science, college, Davidson, etc.<br />Spend a maximum of 30 minutes on this before beginning the labs<br />Tailor this presentation to the needs and interests of the class. If they’re bored, move on. <br />
3. 3. The Activities<br />Suggested Activities for Magnetism are <br />4. Making a Magnet<br />5B. Directional Properties of Magnets<br />7. Magnetic Fields<br />8. The Interaction of Magnetic Fields<br />Be prepared to cut activities if you run out of time.<br />All this information can be found in the student worksheets and instructor guide that comes with your equipment kit. <br />
4. 4. Preliminary Discussion<br />Ask: What substances will a magnet attract?<br />Answer: Substances made of iron, steel, nickel and cobalt<br />Ask: Are all parts of a magnet able to attract with equal strength?<br />Answer: No. The ability to attract is centered in each end of the magnet. These are called the poles. <br />
5. 5. 4. Making a Magnet (A)<br />Have the students rub one end of a bar magnet on a steel needle<br />They must go in the same direction each time, using the same side of the magnet<br />
6. 6. 4. Making a Magnet (A)<br />Have them test if the needle is magnetic by holding it near another uncharged needle<br />
7. 7. 4. Making a Magnet (B)<br />Begin by assembling the battery. <br />Use size four, size D batteries. Insert them in the plastic sleeve.<br />Insert one of the metal tabs between each battery<br />Tape the two at the ends<br />
8. 8. 4. Making a Magnet (B)<br />Wrap a nail in the copper wire.<br />Leave a tail off each end<br />Strip the ends of the copper wire, scissors work just fine.<br />Students will likely need help with this. <br />You might consider doing this for them ahead of time. <br />
9. 9. 4. Making a Magnet (B)<br />Hook the nail to the battery, completing the circuit as shown.<br />
10. 10. 4. Making a Magnet (B)<br />Have the students tests the nail for magnetism.<br />Explain the relationship between current and magnetism.<br />
11. 11. 5B. Directional Properties<br />Have the students charge a needle as in 4A.<br />Tape it to the cork and set afloat in water.<br />
12. 12. 5B. Directional Properties<br />Compare the direction of the needle to a compass.<br />What happens when a magnet is placed near the needle?<br />
13. 13. Discussion Questions<br />Did the magnet always come to rest in the same direction?<br />Yes<br />Which direction is the magnet pointing in according to the compass?<br />It points in a N-S direction.<br />Did the needle act like a compass?<br />Yes<br />Why is it important to make sure the magnet is far away from the compass?<br />The magnet will attract the compass.<br />
14. 14. 7. Magnetic Fields<br />Place a magnet in a plastic bag on top of a brightly colored piece of paper.<br />Scatter iron filings over the top.<br />Tell students not to waste the filings. <br />What does the pattern mean?<br />
15. 15. 8. Interactions of Magnetic Fields<br />Repeat, this time using two magnets with opposite poles near. <br />Try several arrangements of the magnets.<br />
16. 16. Discussions Questions<br />Have students draw the field lines shown by the iron filings. <br />
17. 17. Wrapping Up<br />Clean Up<br />Discuss the experiments with the class.<br />Answer any student questions.<br />Conclude the lesson.<br />Remind them you’ll be back next month. <br />
18. 18. References<br />These activities and discussion questions are from:<br />“Investigating Magnetism”<br />John M. Rogan, Pd.D., Western Montana College<br />Hubbard Scientific Inc. Chippewa Falls, Wisconsin<br />Training slides and photos<br />Lerin Rutherford<br />