# Magnets

In this worksheet, students will read an introduction to magnets and magnetic materials, and they will explore how magnets were first discovered and that they can pull and push away other magnets.

Key stage:  KS 3

Curriculum topic:   Physics: Electricity and Electromagnetism

Curriculum subtopic:   Magnetism

Difficulty level:

### QUESTION 1 of 10

An ancient Cretan shepherd called Magnes once noticed that the iron–tipped end of his crook was pulled down when he walked near a certain type of rock. This rock was Lodestone and is iron-rich with a natural magnetism. The early Chinese also knew about lodestone and in the 12th Century simple compasses began to be used. In about 1600, an Englishman called William Gilbert suggested that the reason compasses always point north was because Earth itself acted as a giant magnet.

Magnets attract (pull) or repel (push away) other magnets. This happens without them coming into contact with each other, as there is a magnetic field, which extends outwards from the magnet. Permanent magnets, which keep their magnetism for a long period of time, are mostly made from iron.  All magnets exert a force on the space around them - the magnetic force - the size of which depends on the strength of the magnet. All magnets have two ends: the north-seeking pole (N) and the south=seeking pole (S). The magnetic field is the strongest at the poles. The N pole would turn freely to the North Pole of the Earth. This is how a compass works. A North and a South seeking pole would attract each other, whereas two same poles would repel.

Apart from compasses, magnets have many other uses, for example:

• In computer hard-drives, where data is recorded on thin magnetic coats
• On magnetic strips on credit cards
• In loudspeakers and microphones
• In food manufacture
• In recycling

What was the first magnetic rock discovered called?

Why do compasses always point north?

Because they are in a fixed position.

Because they are attracted by the Earth's magnetism.

Because they are made this way.

Because they are expensive.

What is the force that magnets exert?

What is the reason that magnets work without touching each other or touching the magnetic object?

They have a magnetic field.

They are very strong.

They do not work if they touch each other.

In the answer box below, write the word which completes this sentence:

If two magnets were placed near each other with their North poles almost touching, they would __________.

In the answer box below, write the word which completes this sentence:

If two magnets were placed near each other with their opposite poles almost touching, they would ___________.

You have a mixture of iron filings and sulphur powder. How can you separate them?

You can put them through a sieve.

You can put them through a filter paper.

You can use a magnet to attract the iron, so you can collect it.

You can blow away the sulphur powder and keep the iron.

Select two uses of permanent magnets.

in loudspeakers and microphones

in computer hard-drives

in washing machines

in microwaves

Why do you think magnets are used in the food industry?

To make the food tasty.

To make the food last longer.

To keep metal filings from machines getting into the food.

To attract vitamins.

How do you think you could see the magnetic field?

You can view it under the microscope.

You cannot see the magnetic field with the naked eye.

You can see it through a camera.

You can test two magnets and see if it works.

• Question 1

What was the first magnetic rock discovered called?

lodestone
EDDIE SAYS
Lodestone is one of the first magnetic types of rock ever discovered in ancient times.
• Question 2

Why do compasses always point north?

Because they are attracted by the Earth's magnetism.
EDDIE SAYS
They are attracted to the geographical North pole of the Earth.
• Question 3

What is the force that magnets exert?

the magnetic force
magnetic force
magnetic
EDDIE SAYS
The name suggests it is a force related to magnetism.
• Question 4

What is the reason that magnets work without touching each other or touching the magnetic object?

They have a magnetic field.
EDDIE SAYS
The magnetic field is the area around the magnet where the magnetic force works.
• Question 5

In the answer box below, write the word which completes this sentence:

If two magnets were placed near each other with their North poles almost touching, they would __________.

repel
EDDIE SAYS
The same poles always repel each other.
• Question 6

In the answer box below, write the word which completes this sentence:

If two magnets were placed near each other with their opposite poles almost touching, they would ___________.

attract
EDDIE SAYS
Opposite poles always attract each other.
• Question 7

You have a mixture of iron filings and sulphur powder. How can you separate them?

You can use a magnet to attract the iron, so you can collect it.
EDDIE SAYS
Iron is magnetic so it will be attracted to the magnet, whereas the sulphur will not be attracted.
• Question 8

Select two uses of permanent magnets.

in loudspeakers and microphones
in computer hard-drives
EDDIE SAYS
The intro of this worksheet mentions the first 2 as uses of permanent magnets at home.
• Question 9

Why do you think magnets are used in the food industry?

To keep metal filings from machines getting into the food.
EDDIE SAYS
Machines in food factories are made from metals and using a magnet would stop iron filings from dropping into food cans and packets.
• Question 10

How do you think you could see the magnetic field?

You cannot see the magnetic field with the naked eye.
EDDIE SAYS
The magnetic field is an area not an object.
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