Take it apart to understand it: exploring how everyday things work

"What's inside?" Sooner or later, most children want to know what's inside a clock, a toy car or a torch. Some try to find out on their own, with mixed results. With an adult beside them and the right object, that curiosity can turn into one of the best hands-on thinking activities there is: taking something apart to understand how it works.

This article explains why it's worth doing, how to keep it safe, and how to turn it into real learning.

Why taking things apart builds thinking

Parts working together. Children see that a toy car moves because a motor turns gears, which turn the wheels. It's systems thinking in their hands.
Spatial thinking. How do the pieces fit? Which part goes on top? How does it all close up?
Cause and effect. "When I push this button, that piece moves."
Patience and care. Screws, clips and tiny springs teach children to slow down.

Choosing safe things to take apart

Choose old, broken objects that nobody needs, and that are safe to open.

Good choices:

A clicking ballpoint pen
A broken toy car or plastic toy held together with screws (batteries removed)
An old battery wall clock (battery removed), which has small plastic gears inside
A torch (batteries removed)
A hand-turned egg beater or an old padlock with its key

Avoid:

Anything that plugs into the mains, such as microwaves, televisions, old monitors and power supplies, even when unplugged, because some parts can store electricity
Anything with button batteries or rechargeable batteries; remove all batteries first, and keep button batteries far away from children, as swallowing one is very dangerous
Glass, sharp metal edges and tightly wound springs

An adult should always be there, and the object should be unplugged and battery-free before you start.

How to do it, step by step

Set up a tray to catch small parts, plus a few cups or an egg box for screws.
Take photos before each step, so you can see how it looked.
Use the right small screwdriver, and let your child turn it with your help.
Go slowly and talk: "What do you think this part does? Why is it shaped like that? What would happen without it?"
Try things out: turn a gear and watch what else moves; press a spring and feel it push back.

Drawing the parts

Drawing helps children remember and understand what they found.

Lay out the parts on a sheet of paper in the order they came out.
Draw each part and give it a name, even a made-up one: "the wiggly bit", "the turning wheel".
Draw arrows to show what moves what: "this gear turns that gear, which turns the wheel".
Older children can try an "exploded" drawing, with the parts drawn slightly apart in the order they fit together.

Can we put it back together?

Putting things back together is a great spatial challenge, but it's fine if it doesn't work.

Use your photos, working backwards from the last one.
Reverse the order: the last part out is usually the first part back in.
Count the screws at the end. Any left over? Where did they come from?

Even if the object never works again, your child has learned how it was built, and that's the real goal.

In Dologi, "Fit the gear" puzzles in the Space topic ask children to drag a gear that fits into each empty spot so that every gear can turn: thinking about how parts work together.

In short

Taking old things apart shows children how parts work together, and builds spatial thinking and patience.
Choose safe, broken, unplugged objects with no batteries, and never open mains appliances.
Go step by step with a tray, photos and lots of "what does this part do?" questions.
Draw and name the parts, then try to put it back together, using your photos in reverse.