Magnetism part 1 final

Nov. 20, 2020
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Magnetism part 1 final

• 2. 2-the Freely suspended magnet always takes fixed direction : • Suspend the bar magnet from its centre with a thread fixed to a wooden stand • Move the magnet then leave it to stabilize again and repeat the step. Observation : One pole of the magnet tries to search for the north direction of the earth, While the other pole tries to search for the south direction of the earth. Conclusion : The freely suspended magnet always takes a fixed direction which is (north-south direction) .
• 3. 2-the Freely suspended magnet always takes fixed direction
• 4. 3-Like(similar ) poles repel and unlike (different) poles attract. When we approach the north pole of magnet to the north pole of the other magnet they (repel ) But when we approach the south pole of magnet to the north pole of magnet they (attract )
• 5. Think and answer : 5 Choose the correct answer 1. The similar magnetic poles…. each other. a. attract b. repel c. do not affect d. replace 2. The unlike magnetic poles……… each other. a. Attract b. repel c. do not affect d. eat Write the scientific term: 1-The pole of the magnet that repels with the north pole of anothermagnet. ……………………………... 2-The pole of the magnet that attracts the north pole of another magnet. ……..……………………..…. North pole South pole
• 6. 4-The magnet is surrounded by magnetic field Magnetic field The space around the magnet in which the effect of the magnet appears The magnetic force : it is the ability of magnet to attract magnetic materials existed in its field . (invisible force ) So , we use iron filings to see the magnetic field that is formed by the effect of magnetic force.
• 7. Watch this video to see the magnetic field
• 8. The compass: A small light needle magnet spins freely around fixed axis . The north pole of magnet points to the north direction The south pole of magnet points to the south direction So Compass is used to determine the four main geographical directions. (G.R) The English doctor William gilbert made a magnetized needle which is used in making compass
• 9. Think and answer : 9 choose the correct answer: 1-. The compass contains ................... a. horse-shoe magnet b. bar magnet c. small light magnetic needle d. ring magnet G.R 1- Compass is used to determine the four main geographic directions. Because it has needle magnet where The north pole of it points to the north direction The south pole of it points to the south direction 2- when you approach a magnet to iron nails ,the most of them are attracted to the two poles of the magnet. Because the attraction force of the magnet is concentrated at the two poles of magnet.
• 10. Discovery of magnet : 2000 years ago, Ancient Greeks found a type of black rocks in an area named Magnesia These rocks have a natural force to attract materials made of iron They named this attraction force the magnetism and named the black rock the Natural magnet
• 11. Types of magnet : bar ring
• 12. Types of magnet : Natural magnet • A black rock • it is one of iron ores called magnetite Artificial magnet • A magnet made by man • It has different shapes and sizes such as ring, bar, horse shoe and needle needle U-shaped bar ring
• 13. Magnetic materials Non magnetic materials The materials that are attracted to the magnet Such as iron, nickel and cobalt and steel The materials that are not attracted to the magnet Such as wood, glass, copper, gold, plastic, chalk Aluminium , leather. •Classification of materials
• 14. Think and answer : 14 Give reasons for the following: 1-Iron, cobalt and nickel are called magnetic materials. ........................................................................................................... 2-Wood, copper and glass are called non-magnetic materials. …………………………………………………………………………………………… Complete the following : 1-Magnetic materials such as……………..,…………..and……………… 2- Natural magnet is one of iron ore is called ……… ………………… 3- Artificial magnet has different shapes such as………………… …and…………… Because they can be attracted to magnet Because they can`t be attracted to magnet Cobaltiron Nickel bar ring… Horse shoe magnetite
• 15. Properties of the magnet: The magnets has two poles Freely suspended magnet always takes fixed direction Like poles repel and dislike poles attract The magnet surrounded by magnetic filed 1 2 3 4
• 17. 1-The magnets has two poles When we approach the magnet to the metallic paper clips Most of the paper clips are attracted to the ends of the magnet The magnetic pole : An area of the magnet that has the most powerful magnetic force The magnetic force : it is the ability of magnet to attract magnetic materials existed in its field . (invisible force )