|Physical Science||Motions and Forces 6B2.00||Unifying Concepts of Science||Scale and Model 2.1ac|
CONTENT STANDARD: Physical Science
CONTENT TOPIC: Motions and Forces
CONCEPT: Magnets are either natural or man-made.
CONTENT OBJECTIVE: 6B2.00 To understand the construction of a magnet and the force it produces
INSTRUCTIONAL OBJECTIVES: The learner will:
TN COMPONENT OF SCIENCE: Unifying Concepts of Science
BENCHMARK: Models are often used to represent concepts of various magnitudes.
2.1c Models are often used to study processes that happen too slowly, too quickly, or on too small or too large a scale to observe directly.
BENCHMARK: Models are often used to represent processes that cannot be directly observed.
The earth is a large magnet with a north pole and a south pole which repel each other.
How did you use the cork and needle to illustrate a magnet?
1. Work with students in groups and ask them to list the materials they are using as magnetic and non-magnetic. Also have students wrap their nails with the wire and connect to their battery. Have them list the materials that can be picked up with their electromagnets.
2. Lead class discussion on the uses of magnetic properties such as lifting tons of steel. Ask for other uses. Have students research ways of making magnets.
3. Make a compass. Find a cork and a needle or pin. Magnetize the needle by rubbing it with the north pole of a magnet. Rub the needle from the blunt end toward the pointed end. Place the cork in a glass bowl or dish filled with water, to which a small amount of soap has been added. Place the magnetized needle on top of the cork so that it is balanced. In which direction does the needle point? Move an iron or magnetic object near the side of the needle. What happens? Why?)
Compare the earth to a magnet.
1. All matter is made up of atoms. (True)
2. The positive charged particles of an atom are electrons. (False, protons)
3. Magnetism is the action of attracting a certain material by the movement of electrons traveling around the nucleus of an atom. (True)
4. Non-magnetic materials available to man are iron, steel, cobalt, and nickel. (False, magnetic)
5. If you place a piece of soft iron next to a permanent magnet and then stroke the iron with the magnet, what will happen?
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