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Do now! You have 2 minutes to play with your magnets. What do you need to know about magnets? Magnets are fun! ALL magnets have two poles • http://www.youtube.com/watch?v=B4UGZ EjG02s NORTH seeking pole SOUTH seeking pole Breaking a magnet produces two magnets! N N S N S S N S Opposites attract! Opposite poles attract and like poles repel Making a magnet Destroying a magnet Magnetic materials Magnetic materials Iron (steel), Cobalt and Nickel Magnetic induction Magnetic induction When a magnetic material is close to a magnet, it becomes a magnet itself magnet S N S We say it has induced magnetism N Hard and Soft Magnetism Soft Magnetism Pure iron is a soft magnetic material before S N S after N S NN Not a magnet Iron nail It is easy to magnetise but loses its magnetism easily Hard Magnetism Steel is a hard magnetic material before S after N S S N NN S N It’s a magnet! Steel paper clip It is harder to magnetise, but keeps its magnetism (it is used to make magnets!) Magnetic fields I wonder if this is a magnetic field? Magnetic fields Magnets (and electric currents) produce magnetic fields around them. In the magnetic field, another magnet or magnetic material will experience a magnetic force. Magnetic field lines We can represent the magnetic field around a magnet using field lines. Magnetic field lines The arrows show the direction a compass needle would point at that point in the field. Magnetic field lines The arrows show the direction a compass needle would point at that point in the field. The closer the field lines are, the stronger the magnetic force felt Field around a bar magnet Earth’s Magnetic Field Remember the North of a compass needle points to the geographic north pole (i.e. the geographic North pole is a magnetic south pole!) Draw the sentence or mind map Draw the sentence 1. Magnets ALWAYS have two poles, North and South. 2. Opposite poles attract, and like poles repel. 3. Iron (steel), cobalt and nickel are the only elements that are attracted to magnets. 4. When a magnetic material is close to a magnet, it becomes a magnet itself. 5. Iron is a SOFT magnetic material;it is easily magnetised but easily loses its magnetism. 6. Steel is a HARD magnetic material; it is hard to magnetise but keeps its magnetism. 7. The magnetic field around a bar magnet is shaped like a burger, with lines and arrows going from N to S. 8. Nottingham is the home of good football. Twice European Champions Independent Wimbledon CD Nottingham Spiderman Forest Times football Guardian Bristol University trumpet Kirsten Dunst teaching cheap physics newspapers red wine Gato negro Rush Tetley Milk, no sugar tea likes music Bruckner Peru Lima places Mr Porter rock classical 3 kids family England Norway George 15 Louis 14 wife Oslo PNG Alice 17 dislikes Port dogs Moresby banks Mr Bean Poo! rudeness Natwest dogs Lik lik hus Blackadder queuing Norway! shopping Alison 21 clothes Poo! Marks and Spencer