AP Physics 2 FRQ Practice by Topic 2027
Every topic has four substantial free-response tasks: Mathematical Routines, Translation Between Representations, Experimental Design and Analysis, and Qualitative/Quantitative Translation. Select one topic, write the response before opening guidance, then use the evidence checklist or self-grader to find what your reasoning is missing.
What do the four AP Physics 2 FRQ practice modes test?
The four sets force you to calculate, translate representations, design/analyze experiments, and connect qualitative predictions to quantitative relationships. That prevents FRQ practice from becoming four copies of the same algebra problem.
One topic at a time keeps the page focused
Lesson pages link directly to the matching set; the base FRQ page remains a directory rather than rendering all 184 prompts at once.
Blackbody Radiation FRQ Set
An ideal blackbody absorbs all incident radiation and emits a continuous temperature-dependent spectrum: increasing absolute temperature shifts the peak to shorter wavelength and increases total emitted power very strongly.
Use absolute temperature in kelvin. Keep the quantitative treatment to the ideal-blackbody Wien and Stefan–Boltzmann relationships rather than adding a real-body emissivity/net-radiation model as required content.
Situation: A student analyzes this Blackbody Radiation situation: As a hot object’s temperature rises, its continuous thermal spectrum becomes more intense and its peak shifts toward shorter wavelength.
- State the governing model and define the system or physical quantities that matter.
- Starting from λmax T = b, derive a symbolic expression for a requested target quantity before substituting numbers.
- Explain how the result changes when one relevant variable is multiplied by a factor while the other model conditions remain fixed.
- Give one units, sign/direction, limiting-case or order-of-magnitude check that could expose an incorrect result.
Open reasoning and scoring evidence
- The response must select λmax T = b only when peak wavelength of an ideal blackbody spectrum.
- Symbols should be consistent with: λmax peak wavelength (m); T absolute temperature (K); b Wien displacement constant (m·K).
- The proportional comparison must follow the functional dependence of the selected relationship rather than an unrelated equation.
- The final check must be physically interpretable, not just a calculator repeat.
Situation: Consider Stars with different surface temperatures have differently located blackbody-like spectral peaks, allowing temperature comparisons from spectra. The same physics must be represented verbally, graphically and mathematically.
- Draw or describe a labeled physical representation showing the important objects, directions, boundaries or measured quantities.
- Sketch the graph or spatial representation that best displays the predicted behavior; label axes, signs and important features.
- Write a relationship consistent with the representation, using P = σAT⁴ when its condition “total emitted power of an ideal blackbody” is satisfied.
- Explain one explicit connection among the diagram/graph, the equation and the physical meaning of blackbody.
Open reasoning and scoring evidence
- The representation must encode the actual physical situation rather than act as decoration.
- Graph features such as slope, area, intercept, curvature, maxima/minima or direction must be linked to the relevant model.
- A valid equation must use variables/units consistently: P total emitted power (W); σ Stefan–Boltzmann constant (W·m⁻²·K⁻⁴); A surface area (m²); T absolute temperature (K).
- blackbody means an idealized object that absorbs all incident electromagnetic radiation and emits a spectrum determined only by its temperature; the explanation should use that meaning to connect the representations.
Situation: Design an investigation for this target: Use blackbody-spectrum simulation or measured thermal-emission data to graph peak wavelength versus 1/T and total power versus T⁴; evaluate whether the transformed graphs support the model.
- State the independent variable, dependent variable and at least two quantities that must be controlled or measured.
- Describe a feasible apparatus/procedure that produces repeated measurements across a useful range of the independent variable.
- Choose a graph or linearization whose slope/intercept/shape tests a relationship such as P₂/P₁ = (A₂/A₁)(T₂/T₁)⁴ and explain the expected trend.
- Explain how repeats, uncertainty and one plausible systematic effect influence the strength of the conclusion.
Open reasoning and scoring evidence
- The procedure must vary one intended cause while controlling plausible competing causes.
- Measurements must be sufficient to test a relationship rather than produce one isolated value.
- The graph choice must follow the expected functional dependence and connect a graph feature to a physical quantity.
- Uncertainty discussion must affect the evidence claim; simply saying “human error” is not enough.
Situation: Compare two valid Blackbody Radiation scenarios based on As a hot object’s temperature rises, its continuous thermal spectrum becomes more intense and its peak shifts toward shorter wavelength. In the second scenario, one relevant variable changes while the model remains valid.
- Predict whether the target physical quantity increases, decreases or remains unchanged before doing algebra.
- Justify the prediction using the physical meaning of blackbody spectrum (the continuous distribution of emitted intensity per wavelength versus wavelength for a blackbody).
- Use λmax T = b or another appropriate relationship from this topic to determine a symbolic factor or ratio.
- State the model boundary that must remain satisfied: Use absolute temperature in kelvin. Keep the quantitative treatment to the ideal-blackbody Wien and Stefan–Boltzmann relationships rather than adding a real-body emissivity/net-radiation model as required content.
Open reasoning and scoring evidence
- The qualitative prediction should appear before the quantitative calculation and should not depend on hindsight.
- The justification must name a physical cause/model, not simply restate that one variable became larger or smaller.
- The symbolic ratio must follow the correct functional dependence and preserve what is held fixed.
- A complete answer states the boundary/assumption so the comparison is not overgeneralized.
Use the FRQ Self-Grader to check evidence quality, then switch to a different topic or a full model exam. Do not improve the response merely by copying phrases from the scoring guide.
AP Physics 2 FRQ practice questions
How many FRQs are available per topic?
Four original multipart FRQs per topic, for 184 topic FRQs across all 46 topics.
Why are there four different FRQ modes?
They deliberately exercise different physics actions: mathematical reasoning, representation translation, experimental/data reasoning and qualitative-to-quantitative reasoning.
Should I open the reasoning guide while writing?
No. Finish a defensible response first. Open the guide only after you have committed to your model, representation and evidence.
Are drafts uploaded or stored on a server?
No server submission is used. The optional response workspace stores drafts only in your own browser when local storage is available.
How should I score my response?
Use the task-specific reasoning guide plus the separate FRQ Self-Grader. Look for explicit evidence, not just a correct final number.
When should I move to full practice exams?
After you can produce complete topic-level responses without relying on the guide. Full exams test whether you can identify the model without a topic heading.