Did you know you can make a compass using a magnet, a slice of cork, a bowl of water and a needle?

Magnetism is an invisible force that affects certain materials.

image of a compass on a map

You don’t need an especially strong magnet to do this. Ours was from a magnet set made by Learning Resources.

Make a compass with a magnet instructions

You’ll need

A bowl

Water

Magnet

Slice of cork

Steel needle

Bowl of water, compass, needle, slice of cork and a magnet ready to make a compass using a magnet

How can you make a compass with a magnet?

Stroke the needle with one end of the magnet about 20 times. Make sure you lift the magnet after each stroke.

Fill the bowl of water to near the top and place the cork slice on top so it floats.

Place the magnetised needle on top of the cork. The cork and needle will turn until the needle faces North – South. The needle lines up with the Earth’s magnetic field. If you have a compass you can check this!

Make sure the magnet is far enough away to not interfere.

Why can you make a compass with a magnet and needle?

The needle is made from steel which contains iron. Iron particles can be magnetised when stroked with a magnet. The effect is temporary, but lasts long enough for you to see the needle act like a compass.

Remember only iron, steel, nickel and cobalt are magnetic!

Is the Earth like a magnet?

The inside of the Earth contains a lot of iron, so much that it acts like a HUGE magnet. It produces a magnetic field with field lines concentrated at the poles.

Diagram of the Earth's magnetic field

The magnetised needle in this activity lines up with the Earth’s magnetic field making it act like a compass.

What is a magnetic field?

A magnetic field is an area where magnetic materials experience a force.

You can demonstrate a magnetic field round a magnet using iron filings.

a magnet with iron filings around it showing the magnet field

What is a compass?

A compass contains a magnetic needle which can move freely. The north seeking pole of a compass points towards the north pole of the Earth. Compasses are used for navigating.

More Magnet Experiments for Kids

We love these magnet powered cars!

Defy gravity with a magnet with this easy trick!

Make a magnet pendulum like Teach Beside Me.

This would also make a great pirate themed science activity!

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Collage of ways to make a compass using a magnet

The post Make a Compass with a Magnet appeared first on Science Experiments for Kids.

Originally posted at Science Sparks