Overall Verdict & Difficulty Assessment

The May/June 2026 examination series maintains Cambridge's established standard of rigorous testing with a solid distribution of straightforward recall, quantitative problem-solving, and qualitative physical explanations. With an overall difficulty rating of 3.2 / 5.0, the paper is very accessible for well-prepared students, while offering discriminators in multi-step calculations (e.g., rocket acceleration accounting for weight, Hubble's law unit conversions) and precise particulate descriptions in thermal physics.

Where the Marks Are Distributed

Mechanics remains the cornerstone of the assessment across all papers, with substantial mark allocations awarded to Motion, Forces, and Energy, Work and Power. Electricity and Magnetism features heavily in Paper 42 and Paper 22, testing potential divider logic, relay circuits, and transformer ratios. Thermal physics demands thorough particle-level reasoning for evaporation and gas pressure. Practical papers (52 and 62) allocate major weight to experimental planning, graph plotting (notably linearized $1/V$ against $R$), and density determination using displacement.

Key Pitfalls and Areas Where Marks Were Lost

  • Neglecting Weight in Resultant Force: In rocket acceleration problems, candidates frequently calculated acceleration as \(a = F/m\) using purely thrust without subtracting gravitational weight \(mg\).
  • Unit and Prefix Handling in Astronomy: Converting light-years to metres and orbital periods into years caused widespread arithmetic errors due to missing factors like seconds per year or incorrectly handling standard form exponents.
  • Vague Particulate Explanations: Explaining evaporation cooling and gas pressure requires explicit mention of the highest kinetic energy particles escaping, leaving lower average kinetic energy behind, or frequent collisions exerting force per unit area. Generic statements like 'heat is lost' forfeit key marking points.

Preparation & Exam Strategy

Ensure systematic working is shown for every calculation, especially where unit conversions are required before applying formulas. In graph-based questions, always choose scales where the plotted points occupy more than half the grid in both dimensions, draw single clean best-fit lines, and show clear gradient triangles covering at least half the plotted line. Master standard definitions word-for-word, particularly for impulse, principal focus, and electric fields.