pilot project

Study Circle — Math & Physics

We work the problems, then argue about them.

A small circle working through math and physics together: shared notes, collected resources, and weekly problem sets we publish so anyone can work along.

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A copy carries over only the public parts you see here — the owners' private files never leave their own vaults.

Published for anyone to work along — our worked solutions stay in the circle until we've all had a real attempt.

A ball is thrown straight up at 12 m/s. How long until it returns to the thrower's hand? (g = 9.8 m/s²)
Two trains 60 km apart approach at 40 and 20 km/h. A bird flies between them at 90 km/h until they meet. How far does the bird fly? (There's a hard way and an easy way. Find the easy way.)
Sketch position, velocity, and acceleration vs. time for a bouncing ball. Where do people always get the acceleration wrong?