Technician’s ListClass Practical

1. Which metal is magnetic? Range of different metals (labelled) –Cu ,Al, Fe, Zn, Sn, Ni, Steel. 2xbar magnets, paper clips.

2. Anti Gravity Challenge. Clamp stand, clamp, bosses, magnet, cotton, paper clip and a selection of materials, including paper, thin card, sheet of iron and piece of tin foil (one set per group)

Demos

1. Iron Filings on bar magnet – bar magnet, iron fillings in a sealed plastic folder, overhead projector.

2. 3d magnetic field viewer (from 6th form).

3. Small transparent compasses to show field lines.

Magnets and their Properties – Part 1

Date

Lesson Outcomes How I did

Targets

Task 1:

To be able to describe some common properties of a magnet.

Level 5

Task 2:

To be able to explain the field lines around a magnet.

Level 6

Task 3 :

To be able to explain how the Earth acts as a Magnet.

Level 7

Connector: (Level 4)

What do you know about Magnets. List as many things as you can.

BIG picture

• What skills will you be developing this lesson?

• Literacy• Team work• Self management• Creative thinking• Independent enquiry • Participation• Reflection

• How is this lesson relevant to every day life? • (WRL/CIT)• Navigation and other uses of magnets.

Anti Gravity ChallengeAnti Gravity Challenge

• You are now tasked with making a paper clip fly in the air.

• You will only be given limited resources. • First group to successfully make the anti

gravity device will get positive points

Are all Materials Are all Materials Magnetic?Magnetic?

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• Have a look at these materials and record which one is magnetic and which one isn’t.

• Form a conclusion. • Are all materials given to you pure metals or

are some of them alloys (mixture of two or more different metals)?

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Magnetic or not?Magnetic or not?

Material Magnetic or non-magnetic?

Conclusion: only certain metals (iron, nickel and cobalt) are magnetic (and anything made from this, like steel)

Electromagnetism : Magnetic?

Which of the metals below are magnetic metals?

Aluminium(Al)

Silver (Ag)

Iron

(Fe)

Gold (Au)

Nickel (Ni)

Cobalt (Co)

Copper (Cu)

Zinc(Zn)

Magnesium (Mg)

Al ZnAg

Cu

Au

Mg

Electromagnetism : Magnetic?

N

S

Fe

NiCo

Only Iron [Fe], Nickel [Ni] and Cobalt [Co] are :

Magnetic or non-magnetic?Magnetic or non-magnetic?

Investigate the different Investigate the different poles of magnetspoles of magnets

• Bring the N and N pole together. What happens?

• Bring the N pole of one magnet to the S pole of another. What happens?

• What can you conclude from this?

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Forces between magnets – Forces between magnets – experimentexperiment

Task 1: Review

Lesson Outcomes How I did Targets

Task 1:

Level 5

Met?

Partly met?

Not met?

How can I improve on task 1?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

Magnetic Fields

What’s a field?

Field is a word we all understand – it’s a place with lots of grass!

But scientists also use the word ‘field’ with another meaning.

A field is an area where a force acts.

So, a magnetic field is the area where a magnet could attract something.

Can you think of any other sort of field in science?

What does a magnetic field look like?

Well, we can’t see it for a start, but...

Small particles of iron filings are pushed into patterns by a magnetic field. If we sprinkle iron filings on a piece of paper over a magnet we can see...

The lines of force are very close together here – the field is very strong.

The lines of force are further apart here – the field is weaker.

A line of force links one pole of a magnet to the other pole.

Demonstrating Magnetic Fields

• Demonstrate the magnetic field around a bar magnet using iron fillings in a plastic container.

• A 3d magnetic field can also be shown here.

• Use a transparent compass to demonstrate that the field lines come out of the N pole and go into the S pole.

Electromagnetism :Magnetic Fields

What does the magnetic field around a bar magnet look like ? [shape and direction].

N S

Strongest at poles

Weaker further away

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N S

Magnetic fieldsMagnetic fields

The rule about directions...

The magnetic force acts in a direction.

The arrowheads on this diagram show you the way the needle of a compass point would go if it was free to move.

You can see that the magnetic force runs from the north pole to the south pole of the magnet.

1. Iron filings can be used to show the shape of the magnetic field.

2. Magnetic field lines always go out of the north pole.

3. Magnetic field lines come out of both ends of a magnet.

4. Magnetic materials placed in the magnetic field will be attracted towards the magnet.

True or false?

TRUE

TRUE

FALSE

TRUE

Magnetic Fields - Summary

1. When two like poles (e.g. two North poles or 2 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 the bar magnets allows us to see the lines of force of the magnetic field.

Task 2: Review

Lesson Outcomes How I did Targets

Task 2:

Level 6

Met?

Partly met?

Not met?

How can I improve on task 2?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

Making a MagnetMaking a Magnet

Try one of these experiments

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Making a magnet

It is possible to make a magnet by magnetising a material which can be attracted to a magnet, e.g. a paperclip. This can be done by:

• Stroking 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.

• Holding a nail in a magnetic field and hitting it with a hammer.

• Putting a magnetic material in strong magnetic field.

Watch this video to help you.

Can you explain why the Can you explain why the paper clip becomes paper clip becomes

magnetised?magnetised?• USE CAMS HILL writing frames to answer this

question. • Watch this to help you

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Task 3: Review

Lesson Outcomes How I did Targets

Task 3:

Level 7

Met?

Partly met?

Not met?

How can I improve on task 3?

Go back to your lesson outcome grid and fill out the ‘How I did’ and the ‘Targets’ column.

Homework

• Homework task: What are the different types of magnets. (names and their definitions)

• Due date:

• Criteria for level 5:

• Criteria for level 6:

• Criteria for level 7:

Review of lesson

A the two ends of a magnet

B not attracted to a magnet

D the end of a freely suspended magnet that faces north

F force that pushes two objects apart

E attracted to a magnet

C attracts a magnetic material to a magnet

C attracts a magnetic material to a magnet

F force that pushes two objects apart

B not attracted to a magnet

D the end of a freely suspended magnet that faces north

E attracted to a magnet

A the two ends of a magnet

Match each word to its correct meaning.

1 magnetic force

2 repulsion

3 non-magnetic

4 north-seeking pole

5 magnetic

6 poles

an alternative task