Free SJPO training, run by physics students from RI and NYJC.
We teach the Singapore Junior Physics Olympiad syllabus through weekly lessons on Discord, recorded lectures, and notes with worked problems.
Why do they line up again?
A pendulum’s period is T = 2π√(L/g), so a shorter pendulum swings faster. These lengths are chosen so that every pendulum completes a whole number of swings in 60 s. At t = 60 s each one is back where it started, so they line up. At t = 30 s, neighbouring pendulums are half a period apart and swing in opposite directions, so you see two rows.
Notes and lectures
Recorded lectures to watch at your own pace, and PDF notes to download.
Take it slowly. Be patient with yourself. Struggle a little. And most of all, enjoy the journey.
Questions
Who can join?
Anyone preparing for SJPO, at any level. If you’re new to physics olympiads, say so on the Discord and we’ll point you to where to start.
Does it cost anything?
No. Lessons, notes and recordings are all free.