1. Ch 7.4 Magnets and electric fields page 273 YR 7 CH 7 FORCES WIKI LIQUID FERRO MAGNETS - YOUTUBE 3 MINS ELECTRO-MAGNET ELECTRO-MAGNET – YOUTUBE 1MIN

2. Don’t copy

3. Magnetic Fields Page 274  Magnetic FieldRegion around a magnet in which a magnetic force is experienced  PolesEnds of a magnet, may be a north or a south pole 

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6. The Earth’s magnetic field  The Earth’s magnetic field protects us from harmful solar radiation – evidence of this are the Aurora Borealis (northern lights) and Aurora Australis (southern lights).  Aurora – dawn/sunrise  Boreas – God the northwind  Auster - Southern

7. Attraction and Repulsion of poles page 276

8. Magnetic domains page 276  DomainsSmall regions inside a magnet which each behave as a mini- magnet, with a north and south pole

9. Types of Magnets page 276  Electro magnets – caused by the floor of electricity in a metal.  Temporary Magneta magnet made from a material that easily loses its magnetism – eg stroking an iron nail with a permanent magnet.  Permanent MagnetA material that remains magnetic for a long period of time – can be formed by heating or hitting a metal to arrange its domains effectively.  The magnetic strip on your credit card can be damaged by powerful magnets.  Dropping a magnet may disturb its domains – destroying its magnetism.

11. Electric Fields page 277  Electric Field- Region around a charged object in which another will experience a force  AtomsTiny particles that make up all matter

12. Charging up page 277  Insulator- Substance through which electrons do not flow, such a plastic  Conductor- Substance through which electrons can flow, such as metal  Positively charged- has more protons (+) than electrons (-)  Negatively ChargedHaving more negative charges (electrons) than positive charges (protons)  Static electricity - a tiny imbalance between positive and negative charge on an object  Electrostatic ForceForce experienced inside an electric field (also called electric force)

13. Page 278 Van de Graaff generator

14. Electric charge discharge page 278

15. LightningLightning safety rules page 279  If outside, seek refuge in a car or grounded building when lightning or thunder begins.  If inside, avoid taking baths, or showers, and washing dishes. Also avoid using landline phones, televisions, and other appliances that conduct electricity.  Stay inside for 30 minutes after you last see lightning or hear thunder. People have been struck by lightning from storms centered as far as 10 miles (16 kilometers) away.  If caught outside away from a building or car, stay clear of water bodies and tall objects like trees.  Find a low spot or depression and crouch down as low as possible, but don't lie down on the ground. Lightning can move in and along the ground surface, and many victims are struck not by bolts but by this current.