A magnet is a rock or piece of metal that can pull certain types of metal toward itself without touching them. That invisible pulling force is called magnetism, and it’s one of the basic forces of nature, right alongside gravity and electricity. If your child has ever stuck something to the fridge or watched two magnets snap together, they’ve already seen magnetism in action.
How Magnets Work
Every magnet has two ends called poles: a north pole and a south pole. These poles follow one simple rule that kids pick up quickly. Opposite poles attract each other, so a north pole pulls toward a south pole. But two of the same pole, north to north or south to south, push each other away. You can feel this yourself by flipping a magnet around and noticing how it switches from snapping together to resisting your push.
Magnets don’t need to touch an object to affect it. They produce an invisible area of influence around themselves called a magnetic field. Anything magnetic that enters that field will feel a pull or a push. The field is strongest right at the poles and gets weaker the farther you move away. If you sprinkle iron filings around a bar magnet, they’ll arrange themselves in curved lines that map out the field, making the invisible suddenly visible.
What Sticks to a Magnet (and What Doesn’t)
Only certain metals respond strongly to magnets. Iron, nickel, and cobalt are the big three. These metals are called ferromagnetic, meaning they’re strongly attracted to a magnetic field and can even hold onto some magnetism after the magnet is taken away. That’s why a steel paperclip (steel contains iron) jumps to a magnet, but an aluminum can barely notices it.
Most materials in everyday life, including wood, plastic, glass, copper, silver, and gold, are not attracted to magnets. Some of these materials are actually pushed away by magnetic fields, though the effect is so slight you’d never notice it without lab equipment. This is a great starting point for a sorting activity with kids: hand them a magnet and let them test objects around the house to discover what sticks and what doesn’t.
Natural Magnets and the First Discovery
People didn’t invent magnets. They found them. Lodestone is a naturally magnetic rock, a form of the mineral magnetite, that ancient people discovered could attract iron. It was once thought to have magical properties, but it’s just magnetism occurring in nature. Early navigators figured out that a piece of lodestone, when allowed to swing freely, would always point in the same direction, which led to the invention of the compass.
Permanent vs. Temporary Magnets
Not all magnets behave the same way. Permanent magnets, like the ones on your fridge, keep their magnetism indefinitely. They’re made from materials that hold onto their magnetic properties once they’ve been magnetized. The bar magnets and horseshoe magnets in a child’s science kit are permanent magnets.
Temporary magnets lose their pull when the thing magnetizing them goes away. A soft iron nail, for example, becomes magnetic when held near a strong magnet, picking up paperclips on its own. Remove the magnet, and the nail gradually drops them. Electromagnets are the most useful type of temporary magnet. They work by running electricity through a coil of wire, creating a magnetic field that can be switched on and off. Electric motors, doorbells, and junkyard cranes all rely on electromagnets.
Earth Is a Giant Magnet
The planet itself produces a magnetic field. Deep inside Earth, the core is surrounded by a mixture of molten iron and nickel. As Earth rotates, currents of electricity flow through that molten metal, hundreds of miles wide and moving at thousands of miles per hour. Those currents generate a magnetic field that reaches from the core all the way out into space.
By the time the field reaches the surface, it’s relatively weak, but it’s still strong enough to nudge a compass needle. A compass is just a lightweight magnet balanced so it can spin freely. Because opposite poles attract, the needle’s north-seeking end points toward Earth’s magnetic pole in the Arctic, giving travelers a reliable way to find direction. Kids can actually make a simple compass at home by magnetizing a sewing needle, resting it on a small piece of cork, and floating it in a bowl of water. The needle will slowly swing to point north.
Magnets in Everyday Life
Magnets are hidden inside dozens of objects your family uses every day. The seal that keeps your refrigerator door shut is a flexible magnet. The speakers in your phone, computer, and TV all use magnets to convert electrical signals into sound. Any appliance with a motor, from a blender to a vacuum cleaner to an electric toothbrush, relies on magnets spinning inside to do its job.
- Fridge doors and cabinet latches: thin magnetic strips that hold doors closed without a latch
- Speakers and headphones: magnets vibrate a thin cone to produce sound waves
- Motors: found in fans, washing machines, hair dryers, and electric cars
- Computers: traditional hard drives store data using tiny magnetic patterns on a spinning disk
- Debit and credit cards: the magnetic stripe on the back holds account information
- Children’s toys: magnetic building blocks, drawing boards, and fishing games all use small magnets
Simple Experiments to Try at Home
Hands-on play is the fastest way for kids to understand magnetism. Here are three activities that need very little setup.
Magnetic scavenger hunt. Give your child a bar magnet or fridge magnet and let them walk around the house testing surfaces and objects. Have them sort items into “magnetic” and “not magnetic” piles. Most kids are surprised that not all shiny metal things are magnetic (aluminum foil, for instance, won’t stick).
Drawing magnetic field lines. Place a bar magnet under a sheet of paper. Sprinkle iron filings on top of the paper and gently tap it. The filings will arrange themselves along the invisible field lines, curving from one pole to the other. It’s one of those experiments that genuinely feels like a magic trick.
Magnetic hopping. Stack two ring magnets on a pencil with the same poles facing each other. Instead of stacking flat, the top magnet floats above the bottom one, pushed up by the repelling force. Kids can press down on the floating magnet and feel the invisible cushion pushing back.
Magnet Safety for Young Children
Small, powerful magnets pose a serious swallowing hazard, especially for children between 6 months and 4 years old. Tiny magnetic beads and high-powered rare-earth magnets (sometimes called neodymium magnets) are the biggest concern. If a child swallows two or more of these magnets at different times, the magnets can attract each other through the walls of the intestines, pinching tissue between them. This can cause blockages, tears in the intestinal wall, and infections that require surgery. A multi-center study in the United Kingdom found that 51% of children who swallowed magnets needed surgical intervention even when the problem was caught early.
A single small magnet that passes through the digestive tract on its own is less dangerous, but multiple magnets or a magnet swallowed alongside a metal object is a medical emergency. Keep small magnetic toys, desk toys with tiny magnet balls, and loose magnets from building sets well out of reach of young children. Age-appropriate magnetic toys designed for small hands, with magnets sealed inside large plastic casings, are a much safer choice for early exploration.