Why do two magnets sometimes snap together and sometimes shove apart?
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After you watchWhy do two magnets sometimes snap together and sometimes shove apart?
The short answer
Two magnets pull together or push apart depending on which ends are facing each other, not on whether the magnet is simply 'sticky.' Every magnet has two opposite ends — a north pole and a south pole. Opposite ends pull together; matching ends push apart.
Try this next
- What if you slide the magnets sideways past each other instead of straight on? Predict first: will they still snap, or slip away? Then drag one magnet across the other off-center and watch which way it gets nudged.
- What if you slowly widen the gap between two ends that pull? Guess how far apart they can be and still feel each other, then pull them apart bit by bit and notice when the snap fades to nothing.
- What if both magnets are turned so matching ends face — can you make one float? Predict whether the top one will balance or flip, then face two matching ends and let go to see the springy push.
Now you — bend it
- What if What if you don't just halve the gap but keep halving it — does the pull double each time, like it would for gravity?Two magnets each have a north AND a south end, so the far end partly cancels the near end. Predict whether that makes the force fade FASTER or slower with distance than a single attracting blob would.
- What if What if you cut the magnet smaller and smaller — past a chip, past a speck, down toward a single atom — does a north-only or south-only piece ever appear?Every cut so far made a fresh little two-ended magnet. Predict whether the very last piece breaks that pattern, and where you think the magnetism is actually coming from inside the metal.
- What if What if you let a magnet float freely on the shove cushion with nothing guiding it — can you ever balance it so it just hangs there, perfectly still?Try to picture nudging it sideways or tilting it a hair. Predict whether the push corrects the nudge and pulls it back to center, or makes it slip and flip away.
Can you prove it?A magnet's pull doesn't live in one 'sticky' lump — it always comes in a north-and-south pair you can never separate. — Hang a magnet from a thread so it swings free and mark which end points north — that's its north pole. Now snap it in half and re-hang each piece: predict you'll get one north-only and one south-only stub, then watch each half still swing to point north on one end and south on the other. Every cut gives a whole new two-ended magnet, which proves the pull is never one lone end.
Design your own test:Before you slide it: if the magnets feel a certain pull at one gap, predict how much stronger they'll feel at HALF that gap — twice as strong, four times, more? Then close the gap step by step and watch how fast the force ramps up near the end.
Explain it to a 6-year-old: Every magnet has a grabby end and a pushy end, and turning one magnet around swaps which kind is saying hello to the other.
The whole story
How it works
The pull of a magnet lives at its two ends, which scientists call poles: one north and one south. When you bring two magnets close, a north end and a south end attract and snap together, while two north ends or two south ends repel and shove apart. Flipping one magnet around swaps which end is facing, so the very same pair can switch from pushing to pulling. The force grows quickly stronger as the gap between them shrinks.
What people get wrong
A common belief is that a magnet is either 'sticky' or it isn't, as if attraction is a fixed property of the magnet. It isn't. The same two magnets can either snap together or refuse to touch depending only on which ends point at each other. Turn one magnet around and a shove becomes a snap, which shows the behavior comes from the ends (poles), not from the magnet being magic-sticky.
The catch
Each behavior is useful for a different job. Opposite ends attracting clamp together tightly, which is great for holding a note on the fridge or latching a cabinet, but once stuck they don't easily let go. Matching ends repelling create an invisible springy cushion that can even make a magnet float — the idea behind maglev trains — but that floating is wobbly and tends to slip sideways or flip over unless something keeps it lined up.
Questions kids ask
Why does flipping one magnet change a push into a pull?
Each magnet has a north end and a south end. Flipping one magnet swaps which end faces the other magnet. If matching ends were facing (a push), flipping makes opposite ends face instead, which pull together. Only the facing ends changed, not the magnets.
Do opposite ends of magnets attract or repel?
Opposite ends attract: a north end and a south end pull toward each other. Matching ends repel: two north ends, or two south ends, push apart.
What happens if you cut a magnet in half?
You don't get one piece with only a north end and one with only a south end. Each half instantly becomes a complete smaller magnet with its own north and south end. There is no such thing as a magnet with a single end.
Why does the pull feel stronger when the magnets are closer?
The magnetic force between two magnets grows quickly stronger as the gap between them shrinks, so the last little bit before they touch feels like a sudden hard snap rather than a gentle tug.
Talk about it
- Same two magnets, but one snaps and one shoves — what do you think changed between the two tries?
- Guess: if we cut this magnet in half, do we get one 'pull' piece and one 'push' piece, or something else?
- Why do you think the magnets fight hardest right when they're almost touching?
For grown-ups
Every magnet is a dipole with a north and a south pole that always occur together; isolated magnetic monopoles have never been observed. Like poles repel and unlike poles attract because the force follows the magnetic field lines, which emerge from the north pole and re-enter at the south. For two small magnets the attraction or repulsion strengthens steeply as they approach, falling off faster with distance than gravity's inverse-square law. Cut a magnet in half and you don't isolate a single pole — each piece becomes a complete smaller magnet with its own north and south.
Keep going
What else makes you wonder?
- If cutting a magnet in half makes two whole magnets, what would happen if you kept cutting and cutting?
- The pull jumps off the ends called poles — so what is filling the empty space between two magnets before they touch?
- Magnets push without touching. What other things in the world reach across a gap to push or pull?