You can find translated past problems from the national finals and semi-finals on dedicated physics competition platforms: : CPhO 2022 English Translation on Scribd. 2019 Finals : CPhO 2019 Theoretical Exam on Physoly.

: Students must decompose systems into different physical regimes and formulate governing equations for stepwise derivations.

A typical CPhO Problems PDF is structured in two distinct phases, mirroring the competition itself. The first part, the "Preliminary" or "Competition" round, presents a series of short-answer and calculation problems designed to be solved in three hours. These problems cover classical mechanics, electromagnetism, thermodynamics, and optics, but with a twist: they require a fluency in calculus and vector analysis that goes far beyond the typical AP or A-level curriculum. For example, a problem might ask for the moment of inertia of a non-uniform rod or the electric field of a charge distribution using Gauss’s law in differential form. The second part, the "Experimental" round, is what truly distinguishes the CPhO. The PDF often includes detailed descriptions of real-world setups—measuring the Young's modulus of a steel wire using optical levers or determining the unknown capacitance of a circuit. The challenge is not just in performing calculations but in designing the experimental procedure itself, analyzing systematic errors, and graphing data with precision.

The most valuable are the , because the current problems (2021-2025) are often copyrighted or behind paywalls.

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