Science 4th grade | UNIT 5: Electricity and magnetism 5.8 Magnetic poles
Magnets have magnetic poles, called the north pole and the south pole. For example, on your bar magnets, the red end is the north pole and the blue end is the south pole. Attraction and repulsion are magnetic forces
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Activity 5.8a (Investigating bar magnets)
You will need: two bar magnets - string Scissors
Your magnets have ends marked in different colours, such as red and blue. Tie a piece of string round the middle of each bar magnet. Hold the end of a string in each hand so that the magnets swing When the magnets stop swinging, bring one magnet close to the other. Make sure that the end of one magnet faces the differently coloured end of the other magnet. What happens to the magnets?
Hold the magnets so that two ends of the same colour face each other. What happens to the magnets?
Predict what will happen if you hold the magnets with the other two ends of the same colour facing each other. Test your prediction. Repeat this a few times to check your prediction.
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Activity 5.8b (Identifying the poles on a horseshoe magnet)
You will need: a horseshoe magnet - a bar magnet
The poles on your horseshoe magnet are not marked.
You can use a bar magnet to identify which end is the north pole and which is the south pole. Plan how you will do this. Now carry out your test.
Questions
1) How did you carry out the test?
2) How did you decide which is the north pole and which is the south pole?
3) Draw the horseshoe magnet and label the poles north and south.