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WOW ! Magnet Magic. 2 Magnetic materials are attracted by magnets Object Made of ? Magnetic? Yes or No?

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Presentation on theme: "WOW ! Magnet Magic. 2 Magnetic materials are attracted by magnets Object Made of ? Magnetic? Yes or No?"— Presentation transcript:

1 WOW ! Magnet Magic

2 2 Magnetic materials are attracted by magnets Object Made of ? Magnetic? Yes or No?

3 3 A paperclip is attracted to the ends of a bar magnet The paperclip is made of steel. The arrow shows the force on the paperclip.

4 4 Representing forces with arrows The magnet also is pulled towards the paperclip. The two forces are the same size and in opposite directions.

5 5 2 magnets These ends attract These ends push apart – (repel) There are two sorts of magnetic poles.

6 6 Making a compass When a magnet is hung up one end will point North.  so it lines up North/South The same end always points North The end that points North is called the north seeking pole N S

7 7 The Earth is a magnet

8 8 A compass uses a tiny magnet which can swing round.

9 9 The Earth is a magnet NORTH POLE

10 10 Using a compass to find directions A compass needle always points to the Earth’s North Pole. Some birds use the Earth’s magnetism to find directions.

11 11 A magnet has a north pole and a south pole. S N

12 12 The north pole attracts the south pole of the other magnet. S N S N S N S N

13 13 The north pole repels the north pole of the other magnet. You can feel the magnets pushing apart. This is called repulsion Note - south poles also repel each other S N S N

14 14 Now for some games!

15 15 Something very new ! A computer that will stay booted up when you switch it off – it will be on sale in a few year’s time. It will have memory called MRAM and use special magnets ! (Magnetoresistive Random Access Memory)

16 16 What have we learned? Magnets will attract magnetic materials  iron and steel Magnets have two sorts of poles  north and south Magnets repel each other as well as attract  similar poles repel  opposite poles attract A compass is a little magnet The Earth is like a magnet  compasses are used to find directions Special magnets are used in computers

17 17 Magnets are used in lots of ways

18 18 It moves ! A motor causes movement. An electric current and a magnetic field can make a simple motor. magnet + electric current  movement

19 19 Spot the motors Can you think of other examples?

20 20 Very tiny motors can be made When the drawer for a CD opens and closes a tiny motor makes it move A tiny motor moves the camera lens when the camera is switched on Many small toys have motors in them  robots, Artificial limbs can use tiny motors to act like muscles

21 Magnets are amazing ! Magnets + electric currents make things move !


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