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Lesson 1.6 Magnets and magnetic fields - teacher’s plan

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1 Lesson 1.6 Magnets and magnetic fields - teacher’s plan

2 What do you think is being shown here?

3 Today I will be able to… Keywords Magnet North pole South pole Magnetic material Magnetic field Magnetic field line Describe how magnets interact To Show how magnetic fields are drawn Describe the earth magnetic field

4 Demo What happens to a paperclip when it is placed near a magnet?
What do you think would happen if a piece of cardboard was placed between the paperclip and the magnet? What about slotting a piece of metal between the paperclip and the magnet? Does it matter which type of metal it is?

5 Forces between magnets – experiment

6 Electromagnet

7 Worksheet

8 Questions How does a magnet affect the movement of the compass needle?
How does the strength of the magnetic field vary around a bar magnet? How does a compass work?

9 Magnetic fields – summary
1. When two like poles (e.g. two north poles or two south poles) are put together, they repel each other. 2. When two unlike poles (e.g. a north and a south pole) are put together, they attract each other. 3. Scattering iron filings around a bar magnet makes it possible to see the lines of force of the magnetic field.

10 There are three methods that can be used to make a magnet:
Making a magnet A magnet can be made by magnetizing a material which is attracted to a magnet, e.g. a paper clip. There are three methods that can be used to make a magnet: Stroke a magnet along the paperclip from one end to the other and then starting from the same place, repeat the movement. The more times this is done, the more magnetic the clip becomes. Hold a nail in a magnetic field and hit it with a hammer. Put a magnetic material in a strong magnetic field.

11 Shape of a magnetic field
What is the shape and direction of the lines of force in the magnetic field around a bar magnet? strongest field at poles strongest field at poles N S weakest field further away from poles Where is the magnetic field strongest?

12 True or False? Work out which are true and which are false. Copy the true ones into your books. Copy out a correct version of the false statements. 1. Magnetic materials do not have to be touching a magnet to feel an attraction. 2. Magnetic field lines always point from South to North. 3. The magnetic field is weakest when the field lines are close together. 4. The magnetic field is strongest at the poles. 5. Opposite poles repel each other.

13 Today I will be able to… Keywords Magnet North pole South pole Magnetic material Magnetic field Magnetic field line Describe how magnets interact To Show how magnetic fields are drawn Describe the earth magnetic field

14 Use your check point sheet to check off how much you know.


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