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Science - 5th Grade
Standard 3 Objective 1
Science - 5th Grade
Standard 3 Objective 2
Students will compare and contrast the patterns that they create using iron fillings and different types of magnets.
For each group:
We know that magnets have forces that draw iron and steel objects toward them. We also know that magnets have poles usually referred to as North and South. Opposite poles attract each other and like poles repel. North ends attract South ends, South ends attract North ends. North ends repel North ends and South ends repel South ends. If they are close enough, depending upon the strength of the magnet, they will come together with great force and must be treated with care.
There are unseen magnetic fields around magnets. North and South polarized ends of magnets are where the strong pulling and repelling occurs. Bar, ring, disc, and horseshoe magnets each have different, distinctly-shaped magnetic fields. Lines within these fields and the patterns they create are referred to as magnetic field lines. These lines seem to flow away from the North end of a magnetic field and return again to the South end.
Earth has a magnetic field very similar to a bar magnet, with magnetic field lines flowing away from the North and returning in an oval pattern to the South Pole. The magnetic North and South Poles are not the same as the true North and South poles as depicted on globes and maps. The North Magnetic Pole is slowly drifting across the Canadian Arctic. The Geological Survey of Canada keeps track of this motion by periodically conducting magnetic surveys to determine the Pole’s location. The most recent survey, completed in May 2001, determined an updated position for the Pole and established that it is moving northwest at approximately 40 km per year.
1. Use Science Process and Thinking Skills
2. Manifest Scientific Attitudes and Interests
Invitation to Learn
Duct tape a strong magnet under a table or sheet of cardboard or poster board. Ask the students what the forces are around a magnet. Slide paper clips along the table/cardboard until they are attracted to the magnet. Explore the patterns.
Note: Ziploc bags are great for freezers and short term storage, but oil left in Ziploc bags overnight makes a mess.