Bellwork (3/26/14)

1
Bellwork (3/26/14)

• The structure of the Earth consists of what four
  parts?
• Crust
• Mantle
• Outer Core
• Inner Core

2
Magnetism

• 3/26/14

3
Magnetism

• Magnetism A force of attraction or repulsion
  between various substances, ultimately it is due
  to the motion of electric charges.

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Magnetism Lab

• 3/26/14

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Purpose

• To explore the properties of magnetism.

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Pre Lab (Write the questions and answer them.)

1. What is the difference between an electrical
   insulator and conductor?
2. Of the materials, list the materials from best to
   worst magnetic insulators? (paper, foil, cotton
   cloth, wool felt, and plastic bags)
3. Why do you think these materials will be better
   magnetic insulators?

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Materials

• 2 bar magnets
• 1 horseshoe magnet
• 1 compass
• 10 paper clips
• printer paper
• aluminum foil
• cotton cloth
• wool felt
• plastic bag

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Part 1 Observations

• Make six detailed observations using the
  materials provided.

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Part 2 Magnetic Insulators

1. Put one layer of the material between a bar
   magnet and the paper clips, record how many it
   holds.
2. Place the magnet with the material near the
   compass (5 cm), record if the compass moves.
3. Repeat step 1 and 2 but put two, four and eight
   layers for each of the 5 materials.

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Part 3 Magnetic Fields

• Draw an arrow in the direction of which way the
  red needle points for each of the diagrams that
  are on the lab tables.

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Data Magnetic Insulators

• Make sure you have about 20 lines
• Example on the Smart Board

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Data Magnetic Insulators
Material Layers of paper clips Compass needle
       
       
       
       
(Need 5 total data tables)
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Magnetism Lab

• Day 2
• 3/27/14

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Bellwork (3/27/14)

• What is magnetism?

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Bellwork (3/27/14)

• What is magnetism?
• A force of attraction or repulsion between
  various substances, ultimately it is due to the
  motion of electric charges.

16
Magnetism Lab

• Day 2
• 3/27/14

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Data Collection

• Part 2 and Part 3 Examples
• Layers 1, 2, 4 and 8 (wool and cotton)

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Cautions and Reminders

• Compasses should not be closer then 5 cm (2
  in.) from the magnets.
• Please keep the magnets separated and the compass
  away from the magnets when done and leave the
  area the way that you found it, thank you.
• There are follow-up questions after part 3.

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Questions (in complete sentences)

1. What happen when two similar poles are near each
   other and when two different poles are near each
   other?
2. Are some materials better magnetic insulators?
   Which materials are better insulator which
   materials are not good insulators?
3. Was your prediction correct from pre-lab question
   2? What were the similarities and differences?
4. What factors do you think contributed to the
   magnetic insulators?
5. What observations did you notice about which way
   the red part of the compass needle points. What
   pole is the red part of the needle?