Engineering Activities for Kids

Engineering is not building things. It is building things that have to work, against a constraint, and finding out where they fail. The failing is the subject.

The four things that must hold

Almost every engineering challenge is one of these, and naming them helps a child see the pattern.

Hold: something must take weight without collapsing. Towers, shelves, chairs.

Span: something must cross a gap. Bridges, roofs.

Carry: something must move a load. Boats, trolleys, bags.

Move: something must go, stop, or change direction. Vehicles, catapults, ramps.

Challenges by what they teach

For structure: the tallest freestanding tower from twenty sheets of paper. Children discover triangles and tubes on their own, which is worth far more than being told about them.

For load spreading: a paper bridge across a thirty centimetre gap that holds the most coins. The first design always fails in the middle.

For buoyancy and stability: a foil boat carrying the most weight. Most children learn about width before they learn about displacement, and both are visible.

For energy: a ramp sending a marble as far as possible. Height, angle and surface all matter and can be tested one at a time.

For protection: the egg drop. The classic, because the failure is dramatic and instantly informative.

For consistency: a catapult that hits the same target twice. Harder than distance, and it introduces the idea that reliable beats impressive.

For systems: a chain reaction with five steps that works three times running. Debugging a physical system is exactly the same activity as debugging a program.

The habit worth insisting on

Test, break, change one thing, test again.

Children want to change everything at once when something fails. Holding them to one change at a time is the single most useful piece of coaching available, and it is the same discipline as a fair test in science.

Talk about failure properly

When it collapses, ask where it failed rather than whether it worked. The specific point of failure is the information.

This is worth labouring, because most children arrive believing that a collapsed tower means they were bad at it. An engineer sees a collapsed tower and knows exactly which joint to fix.

What to use

Newspaper, tape, straws, string, cardboard, spaghetti, marshmallows, foil, lolly sticks, elastic bands. Cheap materials are better than good ones because failure is expected and nobody minds.

A child who has built ten things that fell down has learned more engineering than one who has assembled ten kits that worked.