Post on 18-Nov-2014
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MAGNETS OBJECTIVES
• To know that some materials are magnetic and others are non-magnetic.
• To know that like poles of a magnet repel while unlike poles of a magnet attract.
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ALL ABOUT MAGNETS
Look at the pile of rubbish. Your task is to list which bits (of rubbish) can be picked up with a magnet for recycling.
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ALL ABOUT MAGNETS
Look at the pile of rubbish. Your task is to list bits (of rubbish) which
cannot be picked up with a magnet for recycling. And explain why?
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MAGNETIC OR NON-MAGNETIC?LOOK AT LETTERS A-D and Discuss.
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POLES OF A MAGNET• Suggest practical ways of verifying the
Poles of a Magnet.
REPULSION AND ATTRACTION
Write a complete sentence using the following keywords:
i) Attractionii) Repulsion iii)Like polesiv)Unlike poles
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TASK IITASK 1 Which of these bar magnets will attract each other and which pair will repel? And why?
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Demonstrate magnets in slings for attraction/repulsion.
• Prediction: Make a prediction for this practical activity.
MAGNETIC MATERIALS AND MAGNETS
• Distinguish between Magnetic materials and Magnets.
• A magnet is a material or object that produces a magnetic field and is able to attract or repel.
• All magnetic materials are affected by magnetism, but they do not repel like magnets.
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PRACTICAL ACTIVITY
• Demonstrate all magnetic materials attracted but only magnets repelled.
• Equipment
• Sample of magnet / non-magnetic materials in sets of 8-10.
• 8-10 magnets
REPULSION TEST FOR MAGNETS
OBJECTIVE
• To understand that repulsion is used to test whether or not an object is a magnet.
LEVELS 5-7 HOMEWORK
• Draw a bar magnet showing north and south poles. Use your diagram to answer the following questions
• Where is the magnetism strongest? Put an X.
• Explain why magnetic effect or magnetism is strongest at point X as shown by your diagram.
• Draw a diagram showing the field lines around a bar magnet. What are magnetic field lines?
LEVELS 3-4 HOMEWORK
• Recognise that both magnets and the Earth have magnetic field lines.
• Draw a diagram showing the field lines around a bar magnet.
• What are magnetic field lines?