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Can you make sure you finished last lesson’s brain map? Do now! Do you know the formulae for Friday’s Test? D = m/V P = F/A P = ρhg P1V1 = P2V2 (constant temp and fixed mass) P1/T1 = P1/T1 (constant volume and fixed mass) Vincent (aged 8¾) What do you need to know about magnets? ALL magnets have two poles 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 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 Mr Porter will put these slides on a loop and you are going to mind-map them (Colours, drawings, single words) Mind-map Plotting magnetic fields Plotting magnetic fields Plotting magnetic fields Plotting magnetic fields 1. Single bar magnet 2. Two magnets, opposite poles facing each other 2 cm apart 3. Two magnets, like poles facing each other 2 cm apart 4. Two magnets along side each other, 3 cm apart, opposite poles opposite each other. Field around a bar magnet Two bar magnets Strong uniform field Two bar magnets no field! Uniform field 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!)