At a glance
A learner magnetises a sewing needle, floats it on a sliver of cork, and watches it swing into line with the planet. Then they name the four directions in English, Bulgarian, and any language spoken at home.
Objectives
- Build a working floating compass from household materials
- Name the four cardinal directions in English and Bulgarian (and any home language)
- Observe and discuss what makes the needle align north–south
- Connect the experiment to navigation, geography, and language
What you need (all from the kitchen)
- A bowl or shallow dish of water
- A small cork — a flat slice from a wine cork is ideal
- A sewing needle
- A magnet — a fridge magnet works; a neodymium magnet works better
- A pencil and paper
Why it belongs here
The Now I See It library serves classrooms with a sensor hub — but it also serves home educators, parents at the kitchen table, autodidacts working alone, and anyone without specialist kit. This lesson is deliberately low-tech, and belongs to that side of the library.
What you’re reading is one fixed version. Built — or simply opened — in the Now I See It Lesson Planner, almost any part of it becomes adjustable, as many times as you like:
- Re-pitch the age group — slide it younger or older and the language, questions, and assessment move with it.
- Take it outside — reframe it for the playground or a field, using the sun and a landmark alongside the needle.
- Put them on a ship — set the whole lesson at sea, so learners don’t just read about a sailor’s problem, they live it: a rolling deck, a spilling bowl, iron pulling the needle wrong.
Same core idea, endlessly re-shaped to the learner in front of you. That is the difference between a worksheet and a living lesson.
Educator Guide
Why this lesson
Long before satellites, sailors found their way using a needle and a piece of cork. This lesson lets a learner build a working compass from things already in the kitchen, name the four cardinal directions in two languages, and watch a piece of metal align with the planet’s magnetic field.
It is deliberately low-tech. The platform spans sensor-supported and entirely sensor-free experiments; this is one of the latter.
Lesson flow
Wonder (5 min)
Show the materials. Ask: “How did sailors find north before phones, before computers, before satellites?” Take three answers without judgement. Then: “Today we are going to make the kind of compass they actually used.”
Make (15 min)
Stroke the needle with one end of the magnet, in the same direction, about 50 times. (Back-and-forth does not work — the strokes have to all go the same way.)
Float the cork in the bowl of water. Place the magnetised needle gently on top.
Watch. The needle will swing, pause, and settle along Earth’s magnetic field — pointing roughly north–south.
Name (10 min)
The needle now points roughly north–south. Ask the learner to:
- Mark N on the rim of the bowl where the tip of the needle settles
- Mark S at the opposite side
- Mark E 90° clockwise from N
- Mark W 90° anticlockwise from N
Name them aloud in English: north, south, east, west. Then in Bulgarian: север (sever), юг (yug), изток (iztok), запад (zapad). Then in any other language the learner speaks at home.
Reflect (10 min)
- Why does the needle settle the way it does?
- What would change if you took the compass to a different room? A different country? The South Pole?
- Sailors used compasses like this for centuries. What problems do you think they had at sea?
- The English “north” and the Bulgarian север sound nothing alike, but север and the German “Norden” share roots. What might that tell us about how languages travel?
Assessment
Ask the learner to draw a compass rose, label the four directions in two languages, and explain in their own words why the needle settles the way it does.
Extension for stronger learners
- Investigate magnetic declination — the difference between magnetic north and true north — and find the declination for your location today.
- Try the experiment with the bowl placed near a metal object or a phone. What happens? Why?
- Research one navigation tool older than the compass (the astrolabe, the kamal, Polynesian wave charts) and explain in 100 words how it worked.
Notes for the educator / parent / tutor
This works equally well in a classroom, at the kitchen table, or with a single autodidact learner. It needs no special equipment and produces a real, working scientific instrument in 30 minutes.
The cross-disciplinary thread — Earth Science (magnetic field), Geography (cardinal directions), Language (vocabulary across at least two languages) — is the point, not a side-effect.
Troubleshooting
- If the magnet is weak, double the number of strokes.
- If the cork sinks, use a smaller piece.
- If the needle won’t lie flat on the cork, push it through the cork sideways instead of laying it on top.
A note on learners outside the band
Year band is a starting hint, not a rule. If a learner’s answers consistently far exceed expectations, please read about Gifted and Talented students — recognising these learners early and planning for them well makes a profound difference. If a learner is consistently working below the band, drop back to where they last mastered cleanly and rebuild from there — “more of the same, harder” rarely helps.
This platform serves classrooms, but also autodidacts, home educators, tutors with mixed-ability groups, and adult learners returning to topics. If your learner sits outside any standard cohort, trust readiness over year band.
Student Worksheet
Make a compass at home
What you will need
- A bowl with a few centimetres of water in it
- A small cork (or a slice of one)
- A sewing needle
- A magnet (a fridge magnet is fine)
- A pencil and paper
What you will do
Magnetise the needle. Stroke the needle with the magnet, always in the same direction, about 50 times. Always the same direction — not back and forth.
Float the needle. Float the cork in the bowl. Lay the needle gently on top of the cork.
Watch. The needle will swing, pause, and settle. Mark on the rim of the bowl where the tip points.
Label the directions. The tip points roughly north. Fill in the table with the words for each direction in two languages — and a third if you can.
| Direction | English | Bulgarian | Another language you know |
|---|---|---|---|
| ↑ | north | север | |
| ↓ | south | юг | |
| → | east | изток | |
| ← | west | запад |
Questions to think about
- Why does the needle settle the way it does?
- What would happen if you carried your compass to a different country? Would it still point north?
- Sailors used compasses like this for centuries. What problems do you think they had at sea?
- Look at the words for “north” in three languages. Do any of them sound alike? Why might that be?
A challenge if you want one
Find out what magnetic declination is, and what the magnetic declination for your home is today.
Answer Key
Year: Y05 • Sensor: none (deliberately low-tech home lesson)
Answer guidance pitched at Y05 readiness: use simple sentences and concrete observations (e.g. “The needle pointed the same way every time, which means something invisible was pushing it”).
Q1 · Why does the needle settle the way it does?
The needle has been turned into a small magnet by stroking it. The Earth is also a giant magnet, so the needle pulls into line with the Earth’s pull and points roughly north–south.
Q2 · What would happen if you carried your compass to a different country? Would it still point north?
It would still point north, because the Earth’s magnetic field is the same all over the planet. But near the very top or bottom of the world (the magnetic poles) the compass gets confused because it’s sitting right on top of the thing it’s trying to point at.
Q3 · Sailors used compasses like this for centuries. What problems do you think they had at sea?
Waves moved the bowl. The water spilled. Storms made everything wet. Iron in the ship pulled the needle wrong. Cloud meant they couldn’t check against the sun. Good sailors learned to use many tools together — never just one.
Q4 · Look at the words for “north” in three languages. Do any of them sound alike? Why might that be?
Words sound alike when languages share the same family — like cousins. English north and German Norden sound alike because they both come from old Germanic. Words that sound completely different usually come from different language families that grew up far apart.
A note on learners outside the band
Year band is a starting hint, not a rule. If a learner’s answers consistently far exceed expectations, please read about Gifted and Talented students. If a learner is consistently working below the band, drop back to where they last mastered cleanly and rebuild from there — “more of the same, harder” rarely helps. This platform serves classrooms, but also autodidacts, home educators, tutors with mixed-ability groups, and adult learners returning to topics. Trust readiness over year band.
Accessibility is built in. This page carries the same language, text-size and reading views the platform carries — and Now I See It is working toward full conformance with the European Accessibility Act.