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Students will complete a number of activities to learn about magnetic fields.
Harcourt Science,Grade 4,2002
Harcourt Science,Grade 5,2002
Electricity and Magnetism,Glencoe,McGraw-Hill
Electricity and Magnetism,Prentice Hall
The Magnet Book,Shar and Leslie Johnstone,Sterling Publishing Co.
Learn About Magnets,Steve Parker,Lorenz Books
Magnetism,Peter Riley,Franklin Watts
We know that magnets have forces that will draw iron and steel objects toward them. We also know that when two magnets are brought close to each other, they will repel each other if the north ends or south ends are facing each other. The opposite occurs when the north end faces a south end. They attract each other and if they are close enough, they will collide.
There are unseen magnetic fields around single magnets, between two magnets attracting each other, and between two magnets repelling each other. With the use of iron filings we can see these magnetic fields. By sprinkling metal filings over a single bar magnet, we can see its magnetic field pattern. You will see a different magnetic field pattern when iron filings are sprinkled between two attracting bar magnets. A different magnetic field will be observed when iron filings are sprinkled on two repelling bar magnets. But it doesn't stop there. By getting all types of magnets and sprinkling iron filings on them, you will see all different kinds of magnetic field patterns.
The lines that form these magnetic field patterns are called magnetic field lines. These lines show the direction of the magnetic forces. When iron filings are sprinkled on a bar magnet, you see that these magnetic field lines start at the magnet 's north end and will end at the magnet 's south end. The field lines that curve toward each other show attraction. You will even see these curved lines if you sprinkle iron filings on two attracting bar magnets. However, if iron filings are sprinkled between two bar magnets repelling each other, the magnetic field line will curve away from each other and even stand on edge. The magnetic field forces are pushing each other away and this causes the curving and standing on edge.
1-Use science process and thinking skills.
2-Manifest scientific attitudes and interests.
3-Understand science concepts and principles.
4-Communicate effectively using science language and reasoning.
Invitation to Learn:
What happens when metal filings are put on a bar magnet?
What happens when metal filings are put on a horseshoe magnet?
What happens when metal filings are put on a disc magnet?
What happens when metal filings are put on a domino magnet?
Describe what magnetic fields look like when iron filings show attraction.
Describe what magnetic fields look like when iron filings show repulsion.
Have pictures of different kinds of magnets that have iron filings on them. Have the students describe on paper what is happening by using the vocabulary words magnetic field, repel, and attract. Have them label where the attractions and the repulsions are on the magnets.
This lesson is part of the Fifth Grade Science Teacher Resource Book (TRB3) http://www.usoe.org/curr/science/core/5th/TRB5/. The TRB3 is designed to be your textbook in teaching science curriculum to your students. This book covers all the objectives of each standard and benchmark. If taught efficiently, a student should do well on the End-of-Level (CRT) tests. The TRB3 is designed for teachers who know very little about science, as well as for teachers who have a broad understanding of science.