Tower Lab

Explain why a tower tips or bends

Help your child distinguish the whole tower tipping from a leg bending under compression.

🏗️

Tall and narrow looks efficient — but it changes the physics.Height, base width, beam thickness and bracing all change the tower drawing immediately.

Nallo’s guide for parents

Before the first test

The setup is ready. Ask your child what they expect, then start the test.

Steps

Ask your child: “Will the whole tower tip, will a leg bend, or will it stay standing?”
Start the prepared test after discussing your predictions.
Ask your child to describe the feet and legs separately before naming the failure.

1.00 m tower · 0.34 m basebalanced proportions

Build the tower and predict its first failure.Tipping moment + Euler buckling teaching model

Make a guess

Prediction

Discuss the observation

Ask your child what changed and what stayed the same.

READYWill it tip, buckle, or stay up?

The model checks both failure modes instead of using one generic “strength” score.

Show the numbers

Tip safety—above 1 = stable

Buckle safety—above 1 = stable

Wind force—simplified

First limit——

WHAT TO TRYRun the starter tower.

Then make it much taller without widening the base.

A closer look at this test

💡What your tower teaches

Tipping depends strongly on height and base width. Buckling depends strongly on how long and slender the compressed legs are.

After the first test, change one dimension and compare both safety factors.

What makes a tower fall?

Wind pushes the tower sideways. Shaking moves its heavy parts back and forth. A wide base helps against tipping; bracing helps slender legs.

Try it: make the base wider, test again, and compare the two safety numbers.

An explanation to share

How you can explain it

Wind pushes the tower sideways. A wide base makes the whole tower harder to tip. Diagonal bars help keep its long legs from bending. Those are two different ways to help.

BracingExtra diagonal bars that help a frame keep its shape.

Away from the screen

An activity for you to guide

Build two block towers of the same height: one narrow and one with a wider base.
Place the board on the floor and tilt it gently yourself while your child observes.
Watch which falls first. Use light blocks and keep feet clear.

Explanation guide for parents

Stay with your child throughout the experiment. Read the task together, compare your predictions and start the test. Operate the controls, then discuss what changed.

Support your child’s reasoning

Help children name what failed: the whole tower tipped, or a leg bent. Open Wind & shaking to explore shaking after they understand the wind test.

Ask: “What did you change? What did you notice? What will you try next?” A different result is a clue, not a bad score.

Screen and real life

The wind and shaking tests use simplified forces. Real buildings have joints, moving parts and many other details.

Use the simulation to discuss patterns. You remain responsible for choosing and supervising any physical activity; real results can differ.

A question to take it further

Would a wider base and thicker legs help in the same way?

A common misunderstanding

A wider base and diagonal bracing solve different problems. Neither makes every tower safe; these are simplified model tests, not building calculations.

How the model works

2D teaching model with symmetric legs, idealized payload, simplified wind pressure and Euler buckling. Braced levels shorten the unsupported leg span; unbraced floors add mass. One idealized anchor provides 12 N hold-down; the isolated base transmits 65% of selected acceleration. The first failure is found while the sideways load rises, with the tower’s own weight already acting. Leg compression is approximated from vertical support reactions. Shaking is an equivalent static load, not a time-history earthquake simulation. Real quake response, joint failure, imperfections and 3D torsion are not modeled.

Quick guide: s = seconds · m = metres · cm = centimetres · kg = kilograms. For weight, g means grams. In the landing or shaking results, g means acceleration compared with Earth’s gravity.

BUILD 20 · PARENT GUIDE · 29 SEP 2026