Download 18-1 Magnetism - Thomas C. Cario Middle School

Name ______________________________________________________ Period ________________
Section 18-1 “What is Magnetism”
Whole-Class Lab Demonstration: Below are drawings of magnets. The teacher will lightly
sprinkle iron filings over each until a pattern emerges. Draw the lines of force that show the
location of the magnetic field.
1.
N
2.
3.
S
S
N
N
S
S
N
S
N
4. What do the letters N and S stand for on the magnets? _________________________
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5. Based on the arrangement of the iron filings, where on the magnet is the strength of the
magnetic field the greatest? ____________________________________________
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Magnetism 18-1 Fill-In Notes (Use pages 518-523 to fill-in the notes below.)
1. Magnets attract objects that contain ___________________________________.
2. All magnets have two ends. What are these ends called? ______________________
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3. Copy the diagram shown at the bottom of page 518 showing the interaction between the North
and South poles of a magnet.
4. All magnets are surrounded by a ________________________________ that exerts a magnetic
force (magnetic push or pull) on other magnets.
5. Magnetic field lines can be used to show where the magnetic force is strongest.
Where is the magnetic field strongest on a magnet?
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6. Earth has a magnetic field shaped similar to that of a ____________________.
7. Earth’s magnetic field causes a ________________________________ to rotate.
8. A compass needle is a ________________________________________________.
Section-1 Review Questions
1. Describe how the behavior of electric charges is similar to that of magnetic poles. (p.520)
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2. Think Critically: A horseshoe magnet is a bar magnet bent into the shape of the letter “U”.
When would two horseshoe magnets attract each other and when would they repel each
other?
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3. Communicate: Ancient sailors navigated by using the Sun, stars, and following the coastline.
How did the development of the compass improve their ability to navigate?
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