Difficulty Verdict
The May/June 2025 sittings for IGCSE Physics 0625 presented a moderate-to-high challenge, particularly in the Extended Theory (Paper 42) component. While fundamental definitions and standard formulaic calculations remained highly accessible, several conceptual discriminators pushed candidates to demonstrate precise mathematical and physical rigor. The inclusion of the refreshed Space Physics syllabus (e.g., lifecycle of massive stars and gravitational field dynamics) demanded absolute clarity of recall rather than general descriptions.
Where the Marks Are Won or Lost
Marks were heavily concentrated in the application of mechanical and electrical formulas. Structured calculation questions, such as the conservation of linear momentum and the principle of moments, provided substantial marks but were also high-risk. In momentum conservation, candidates who successfully designated a coordinate direction (recognizing that train B was travelling in the negative direction, i.e., \(-0.12\text{ m/s}\)) easily claimed full marks. Conversely, those who ignored the sign lost significant accuracy points. In electricity, converting power to kilowatts before finding kilowatt-hour energy consumption proved to be a frequent stumbling block for candidates who rushed their calculations.
Examiner Pitfalls and Traps
A recurring examiner classic was the definition of the 'moment of a force'. Scores of students lost a mark here by failing to state the keyword 'perpendicular' when describing the distance from the pivot. Similarly, in graphical interpretation, calculating the deceleration of the ice skater at \(t = 9.0\text{ s}\) required drawing a clear, physical tangent line. Many candidates attempted to calculate a rise-over-run directly from coordinates of the curve, yielding an incorrect gradient and forfeiting the method mark entirely. In the waves section, the exact alignment of dispersed colors (red at the top, violet at the bottom) at both boundaries of a glass prism remained a highly penalized visual detail.
Revision Strategy and Prediction
For future sittings, students must focus on multi-step calculations that integrate across chapters, such as using moments to find mass, and then using mass and geometric volume to compute density. Additionally, standard definitions must be learned word-for-word as specified in the syllabus. Our analysis suggests that Boyle's Law calculations (\(P_1V_1 = P_2V_2\)) and structured Snell's Law refraction problems are highly overdue for prominent written parts in upcoming sessions. Focus on mastering these along with vector equations to secure top-tier marks.