2025 AP AP Physics 2: Algebra-Based Past Paper: Analysis & Answers

Executive Overview

The 2025 AP Physics 2 Free-Response section was balanced across four core operational task models: Mathematical Routines (MR), Translation Between Representations (TBR), Experimental Design and Analysis (LAB), and Qualitative/Quantitative Translation (QQT). With an overall mean score of 3.38/5 and 21.7% of candidates scoring a 5, performance was robust in algebraic starts and data plotting, but notable mark drops occurred in conceptual justifications and scientific notation handling.

Where Marks Were Won and Lost

• Question 1 (Magnetism & Induction - 10 Marks): Students scored well on identifying magnetic field directions (78%) and basic equation identification (76%). However, only 21% earned the final point on Lenz's law justification (\(B3\)) due to failure to articulate the direction of the opposing induced flux when the loop recedes.
• Question 2 (Thermodynamics - 12 Marks): The strongest question on the paper (mean 8.19/12). Free-body diagrams and \(PV\) compression curve sketches were largely executed well, though many students mixed scalar pressures and vector forces in equilibrium statements.
• Question 3 (RC Circuits LAB - 10 Marks): Plotting and line-of-best-fit skills were strong (>85%), but calculating the final experimental capacitance value (\(D2\)) scored only 35% because students routinely omitted the \(10^{-10}\text{ C}\) multiplier from the charge axis.
• Question 4 (Physical Optics QQT - 8 Marks): While students easily related \(c = f\lambda\), only 26% correctly identified the double-slit geometry factor where the distance between Bright Band A (\(m=2\)) and Bright Band B (\(m=-2\)) spans \(4y_1\).

Examiner Pitfalls & Strategic Advice

To maximize marks on future sittings, students should:

• Always state fundamental starting equations before substituting given variables.
• Never write scalar pressure terms (\(P\) or \(P_{\text{atm}}\)) directly on free-body diagrams—forces must be labeled as \(F_{\text{gas}}\) or \(P \cdot A\).
• Scrutinize table headers and graph axes for scientific notation scaling factors before finding slopes.
• Ensure qualitative wave interference claims explicitly mention path length difference \(\Delta D = m\lambda\) rather than generic wavelength assertions.