The Mistake Museum: How Students Actually Get Mechanics Wrong

Students aren't bad at physics. They're wrong in predictable ways.

Every mechanics teacher meets the same errors. Displacement read as distance. Acceleration treated as speed. The normal force set equal to mg. A force invented to keep an object moving. These mistakes aren't random. They come from models students build before they reach your class, and they survive being told the right answer.

The Mistake Museum is a field guide to those models — 89 entries across six mechanics topics, each one a single misconception. Every entry follows the same plan:

The Trap — what students actually say, in their own words

What's True — the physics, stated plainly

Never Say / Say Instead — the wording to drop, and the wording to use in its place

The Repair — a move you can make in the moment

Where It Shows Up — the problems and contexts where the error surfaces

A language index at the back collects every wording fix in one place, grouped by topic, for planning or for the moment in class when the words matter.

Topics: motion and kinematics, Newton's laws, energy, momentum, and projectile and circular motion. Drawn from physics-education research and classroom diagnostics.

This is the full-colour edition, delivered as an instant PDF download — 187 pages, formatted for screen and print. Built for teachers of IB Diploma, A-Level, AP, and IGCSE physics.