AP Physics C Mechanics FRQ how to answer the free response.
The AP Physics C Mechanics free-response section is half your exam score, and it rewards clear, calculus-based reasoning as much as a correct number. Here is what the four questions look like, how they are scored, and how to write solutions that earn the points.
What the AP Physics C Mechanics free response looks like
Section II is four multi-part free-response questions in 100 minutes, worth 50% of your score, and you handwrite your solutions. Because the course is calculus-based, expect to set up derivatives and integrals — for example deriving velocity from a position function, or integrating to find work or center of mass — and to reason with graphs and experimental setups.
A calculator and the equation sheet are allowed, so the questions are not about recall; they are about choosing the right physics and the right calculus and showing it clearly.
How the AP Physics C Mechanics FRQ is scored
Each question is scored point by point against a rubric, and the points are spread across the work, not just the final answer: the calculus setup, the equation you select, the substitution, the algebra, the units, the physics justification, and any labeled diagram can each earn credit. That means a wrong final number can still score well if the reasoning is sound — and a right number with no work often scores poorly.
Answer every part, even briefly, because the points are distributed across parts rather than concentrated in one.
Justify every step
Communication matters in Physics C. Write in precise sentences, state the principle you are using before the equation, and explain why your approach works. A reliable habit: name the principle, write the equation, do the calculus or algebra, then state the result with units and a one-line justification.
When a problem looks messy, check whether an energy approach is simpler than a force approach — conservation of energy often avoids a hard differential equation that Newton’s second law would create.
Where students lose the most points
How to practice the AP Physics C Mechanics FRQ
Work official past free-response questions under a timer, then grade yourself against the published scoring guidelines so you learn where the points actually live. Keep our equation sheet next to you so setups become automatic, and use the broader AP Physics C Mechanics review guide to connect the FRQ work to the rest of the exam. To check where a practice score lands, run it through the score calculator.
Frequently asked questions
Quick answers — written by humans, not a chatbot.
How many free-response questions are on AP Physics C Mechanics?
Four multi-part questions in 100 minutes, worth 50% of the exam, handwritten in a paper booklet.
Is calculus expected on the AP Physics C Mechanics FRQ?
Yes. You should expect to take derivatives and evaluate integrals, since it is the calculus-based mechanics course.
How is the AP Physics C Mechanics FRQ scored?
Point by point against a rubric — setup, equation choice, calculus, units, justification, and diagrams all earn credit, with generous partial credit.
Should I use energy or forces on a Physics C FRQ?
Often energy is simpler. Conservation of energy can avoid a difficult differential equation that a force approach would create.
Do I get an equation sheet on the AP Physics C Mechanics FRQ?
Yes — the equation sheet and a calculator are available for the free-response section as well as the multiple choice.