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# Lesson 7 the power of magnets

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### Lesson 7 the power of magnets

1. 1. The power of magnets <br />Lesson 7<br />
2. 2. Magnetism<br />Is a force of attraction or repulsion that acts at a distance. <br />It is due to a magnetic field, which is caused by moving electrically charged particles or is inherent in magnetic objects such as a magnet.<br />A magnet is an object that exhibits a strong magnetic field and will attract materials like iron to it.<br />Magnets have two poles, called the north (N) and south (S) poles. <br />
3. 3. Attraction<br />When two magnets or magnetic objects are close to each other, there is a force that attracts the poles together.<br />Force attracts N to S<br />Magnets also strongly attract ferromagnetic materials such as iron, nickel and cobalt.<br />
4. 4. Repulsion<br />When two magnetic objects have like poles facing each other, the magnetic force pushes them apart.<br />
5. 5. Magnetic materials<br />Magnets can attract other magnets but they can also attract magnetic materials.<br />The magnetic materials are always metals but only a few metals are magnetic.<br />Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip, for example, will be attracted to a magnet.<br />
6. 6. Most other metals, for example aluminium, copper and gold, are NOT magnetic. An aluminium drinks can, for example, will not be attracted to a magnet.<br />http://www.youtube.com/watch?v=2vqgXRKHI-s&feature=related<br />
7. 7. Game <br />http://www.funny-games.biz/magnetism.html<br />http://www.candystand.com/play/magnets<br />http://www.bbc.co.uk/schools/scienceclips/ages/7_8/magnets_springs.shtml<br />