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Play with your magnets!. ALL magnets have two poles NORTH seeking pole SOUTH seeking pole.

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Presentation on theme: "Play with your magnets!. ALL magnets have two poles NORTH seeking pole SOUTH seeking pole."— Presentation transcript:

1 Play with your magnets!

2 ALL magnets have two poles NORTH seeking pole SOUTH seeking pole

3 Breaking a magnet produces two magnets! NS NS NNSS

4 Opposites attract!

5 Opposite poles attract and like poles repel

6 Magnetic materials

7 Iron (steel), Cobalt and Nickel

8 Magnetic induction

9 When a magnetic material is close to a magnet, it becomes a magnet itself We say it has induced magnetism N S N S magnet

10 Hard and Soft Magnetism

11 Soft Magnetism Pure iron is a soft magnetic material It is easy to magnetise but loses its magnetism easily N S beforeafter Iron nail S N N S Not a magnet N

12 Hard Magnetism Steel is a hard magnetic material It is harder to magnetise, but keeps its magnetism (it is used to make magnets!) N S beforeafter Steel paper clip N N S Its a magnet! N S SN

13 Magnetic field I wonder if this is a magnetic field?

14 Magnetic field Magnets (and electric currents) produce magnetic fields around them. In the magnetic field, another magnet or magnetic material will experience a magnetic force.

15 Magnetic field lines We can represent the magnetic field around a magnet using field lines.

16 Magnetic field lines The arrows show the direction a compass needle would point at that point in the field.

17 Magnetic field lines The closer the field lines are, the stronger the magnetic force felt The arrows show the direction a compass needle would point at that point in the field.

18 Earths Magnetic Field N S Remember the North of a compass needle points to the geographic north pole (i.e. the geographic North pole is a magnetic south pole!)

19 Field around a bar magnet

20 Two bar magnets Strong uniform field

21 Two bar magnets no field!

22 Thats it!

23 Mind-map Mr Porter is now going to put these slides on a loop and youre going to mind-map them!

24 This lesson ac/dc Insulation and double insulation Earthing, fuses and circuit breakers Formative assessment

25 Gather round!

26 Reading! Read carefully pages 192-195 Answer the questions on both pages Finish for homework due Tuesday 13 th January


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