Transcript What is a Scientist? - Cockeysville Middle School

Objective: To diagram magnetic lines of force
in order to identify the magnetic
fields of single magnets.
Energy Note: How can magnetic fields be seen??
Drill: 1. Get a new lab from the SET.
2. Complete the Drill in Activity 1.
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What do you think is meant by the
term “magnetic field”?
The area around a magnetized object
affected by its magnetism.
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Activity 2: Diagramming Magnetic
Fields DEMO
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Why do you think this pattern occurs?
The iron filings line up according to the
forces within the magnetic field.
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MAGNETIC FIELDS
Any magnet, no matter what its shape, has
two ends called poles. A pole is the area of
a magnet where the magnetic effect is
strongest. One pole of a magnet points
towards magnetic north of the earth and is
labeled north. The other pole is labeled
south.
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Although magnetic forces are strongest at
the poles of a magnet, they are not limited
to the poles alone. Magnetic forces are
felt around the rest of the magnet as well.
The region over which the magnetic
forces can act is called a magnetic field.
A magnetic field can be drawn using
magnetic lines of force extending from one
pole of a magnet to the other.
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The following guidelines should be applied
when making magnetic field diagrams of
magnets:
• Representative arrows must leave the
north pole of the magnet.
• Representative arrows must enter the
south pole of the magnet.
• Representative arrows are more
concentrated at the poles of a magnet.
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Proper Force Diagram
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You have diagrammed the magnetic fields
for bar magnets. Now, let’s consider the
magnetic fields for other shaped magnets.
In your Log Book draw a horseshoe magnet.
Draw magnetic lines of force to predict
how the magnetic field will look.
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HOMEWORK
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Objective: To diagram magnetic lines of force
in order to identify the magnetic
fields of pairs of magnets.
Energy Note: How can magnetic fields be seen??
Drill: 1. Take out your Activity Sheet from Friday.
2. Get a new ditto from the SET.
3. Make your first prediction only.
4. Take out your Career Day form.
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Opposite Poles
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North and North
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South and South
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Two Horseshoe Magnets – Like Poles
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Analysis:
Explain how the magnetic field of each bar
magnet is altered when the north pole of one
magnet is brought near the south pole of the
other magnet. Justify your response using
evidence from the investigation.
When the north pole of one magnet is
brought near the south pole of the other
magnet, the magnetic fields __________ each
other. The iron pieces formed
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