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Students will construct a compass and explain how it works.
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.
Magnets, Janice VanCleaves, Spectacular Science Projects
Magnet Science, Glen Vecchione, Sterling Publishing Co., Inc.
We can make a compass out of a needle. Rub a needle with a magnet. Make sure you always rub it in the same direction. The needle becomes magnetized. By placing the needle on a cork floating on water, one end will point toward the North pole and the other end will point toward the South pole. A compass has been made. The end pointing toward the North pole is called the north end of the compass and the end pointing toward the South pole is called the south end of a compass. The ends are, therefore, named North (N) and South (S) because of the direction each points.
If the north end (N) of a bar magnet is held close to a compass, the south end (S) of the compass will be attracted to it. The same holds true when the south end (S) of a bar magnet is held close to the north end (N) of a compass. When a magnet is brought close to a compass, the magnet 's magnetic field overrides Earth 's effect on the needle. When the magnet is taken away, Earth's magnetic field affects the compass once again.
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.
5-Demonstrate awareness of social and historical aspects of science.
Invitation to Learn:
Magnetize a needle and tape it on a cork. Put the cork in a bowl of water and let it float. With the bowl in your hand, turn in all directions and see what the needle does.
Glue thread to a magnet ball and suspend in mid-air. When the ball has stopped turning, mark the side "N" that is facing north. Paint that side of the ball white. Suspend the ball in mid-air. Stand in place and turn in a circle. What do you observe? Walk around the room with the ball suspended in mid-air. What do you observe?
Experiment to see what other things might be magnetized to become compasses, (e.g., nail, paperclip, screws, nuts, different types of wire).
Make a compass with a small nail, magnet, and thread. Show which end is north and which end is south.
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.