Science

Magnets (F 18-21)

Objecives:
1. TLW find out about magnet poles.
2. TLW findout how magnetic fields cause magnetic force.
3. TLW find out how to use Earth's magnetic field to find direction.

Brainpop review - Magnets

Study Guide
1. A _______________________ is an object that attracts certain materials, usually objects made of iron or steel.

2. A magnet has two ends called __________________________________________.

3. The north-seeking pole always swings ________________________________________.

4. The south-seeking pole will always point _______________________________________.

5. A ___________________________________ is the space around a magnet where the force of the magnet can act. Opposite magnetic poles attract, and like poles repel.

6. The ppull of the magnet is the strongest at the ____________________________________________.

7. If you cut a magnet in half, you get _______________________________ magnets because each half is a magnet with a pole at teach end. (example on page F18)

8. For hundreds of years people have used magnets to find ____________________________________.

9. The first magnets used were made of a heavy natural material called _______________________________.

10. A compass today uses a light weight magnetic _______________________ that is free to ______________.

11. A compass needle points along an imaginary line connecting the __________________ and ________________ oles.

12. This is because Earth is like a giant ___________________________________________.

13. How does a compass work? ___________________________________________________________________________________

___________________________________________________________________________________

14. A ___________________________________ magnet has a field that is about the same shae as the magnetic field of the earth.

15. Open field lines are formed as the two magnets __________________________ each other.

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Answers
1.  A magnet is an object that attracts certain materials, usually object made of iron or steel.

2. A magnet has two ends called magnetic poles.

3. The north-seeking pole always swings north.

4. The south seeking pole will always swing south.

5. A magnetic field is the space all around a magnet where the force of the magnet can act. Oposite magnetic poles attract, and like poles repel.

6. The pull of the magnet is the strongest at the poles.

7. If you cut a magnet in half, you get two magnets because each half is a magnet with a pole at each end.

8. For hundreds of years, people  have used magnets to find direction.

9. The first magnets used were made of a heavy natural material called lodestone.

10. A compass today uses a lightweight magnetic needle that is free to turn.

11. A compass needle points along an imaginary line conncecting the North and South poles.

12. This is because Earth is like a giant magnet.

13. How does a compass work?The north seeking pole of the free movign magnet in the compass points to Earth's North Pole.

14. A bar magnet has a field that is about the same shape as the magnetic field of the Earth.

15. Open field lines are formed as the two magnets repel each other.