AP Physics 1 FRQ Practice Guide

title: "AP Physics 1 FRQ Practice Guide" description: "Master FRQ scoring, 4 archetypes, free body diagram rules, claim-evidence-reasoning, and 2 worked examples. Score every point on the exam." date: "2026-01-15" examDate: "May AP Exam" topics:

• FRQ Scoring
• FRQ Archetypes
• Free Body Diagrams
• Claim-Evidence-Reasoning

The AP Physics 1 exam includes 5 free-response questions (FRQs) worth 50 out of 200 points. That's 25% of your final score. You cannot skip FRQs and ace this exam.

This guide teaches the scoring rubrics, the 4 archetypes College Board reuses every year, and the non-negotiable physics communication rules that earn full points.

FRQ Scoring Overview

Each FRQ is worth a specific point total:

• Mathematical Routines (15 pts): Multi-part calculation; focuses on setup and correct application of formulas.
• Translation Between Representations (12 pts): Convert between graph/data/equation formats; interpret physical meaning.
• Experimental Design & Analysis (10 pts): Design an experiment, identify variables, propose a method to test a hypothesis.
• Qualitative/Quantitative Translation (7 pts): Explain using both words and math. This is the "claim-evidence-reasoning" format.

⚠️ Key insight: Point totals vary, but setup + justification accounts for 50–70% of points. Your calculation is only half the battle.

The 4 FRQ Archetypes You'll Face

Archetype 1: Mathematical Routine (15 pts)

Structure: Multi-part problem, typically 3–4 parts (a, b, c, d). Each part builds on the prior.

Example: A block slides down a frictionless incline. Part (a) asks for acceleration. Part (b) asks for the speed at the bottom. Part (c) might ask for the time to reach the bottom.

Scoring pattern:

• Correct setup (drawing, identifying the key physics principle): 3–4 pts.
• Correct derivation or application of equations: 3–4 pts per part.
• Numerical answer with units: 1–2 pts per part.
• You can earn partial credit even if part (a) is wrong, as long as part (b) uses the wrong answer from (a) correctly.

How to ace it:

1. Draw a diagram (free body diagram if forces are involved).
2. State the physics principle you're using: "Using Newton's second law, $\Sigma F = ma$…"
3. Set up the equation(s) symbolically before plugging in numbers.
4. Show all algebra and arithmetic.
5. Include units in your final answer.

Archetype 2: Translation Between Representations (12 pts)

Structure: You're given data (table, graph, or verbal description) and asked to extract physics from it or predict what a graph will look like.

Example: A table shows velocity vs. time for a moving car. Part (a) asks you to sketch an acceleration vs. time graph. Part (b) asks you to calculate the displacement.

Scoring pattern:

• Correct interpretation of the data: 2–3 pts.
• Correct graph or calculation: 3–4 pts per part.
• Explanation of what the graph/data tells you about the physics: 2–3 pts.

How to ace it:

1. Read the axes carefully. What does slope represent? Area under the curve?
2. For graphs: label axes with numbers and units. Mark key features (intercepts, slopes, peaks).
3. For calculations: explicitly link the data to the physics (e.g., "slope of $v$ vs $t$ is acceleration").
4. Write the "so what": e.g., "The constant slope indicates constant acceleration, consistent with Newton's 2nd law."

Archetype 3: Experimental Design & Analysis (10 pts)

Structure: Scenario describes a physical phenomenon. You propose an experiment to test it: identify variables, propose a procedure, and explain how you'd analyze results.

Example: "Design an experiment to test whether the period of a pendulum depends on its length."

Scoring pattern:

• Clear identification of independent, dependent, and control variables: 2 pts.
• Procedure (step-by-step): 3–4 pts.
• Data collection plan (what measurements, how many): 1–2 pts.
• Analysis plan (how would you graph or calculate to test the hypothesis?): 2–3 pts.

How to ace it:

1. Variables:

   • Independent: What you change (e.g., pendulum length).
   • Dependent: What you measure (e.g., period).
   • Control: What you keep constant (mass, release angle, amplitude).

2. Procedure: Write in imperative voice ("Attach a mass to a string…"). Be specific (lengths: 0.5 m, 0.75 m, 1.0 m, etc.).

3. Data collection: "Measure the time for 10 oscillations using a stopwatch. Repeat 3 times and average."

4. Analysis: "Plot period $T$ (y-axis) vs. length $L$ (x-axis). If the relationship is $T = 2\pi\sqrt{m/k}$, the graph should be a curve, not a line. Fit the data to check."

Archetype 4: Qualitative/Quantitative Translation (7 pts)

Structure: "Explain" or "justify" questions that require both words and math.

Example: "The collision is elastic. Justify this claim using specific energy values."

Scoring pattern:

• Clear claim (1 pt).
• Evidence: numerical calculation or reference to data (2–3 pts).
• Reasoning: explains why the evidence supports the claim (2–3 pts).

How to ace it: Use Claim-Evidence-Reasoning (CER).

Claim-Evidence-Reasoning (CER) Framework

Every "explain" or "justify" prompt on an AP Physics FRQ should be answered using this structure.

Example: An elastic collision occurs. Justify.

Claim (state clearly): "This collision is elastic because kinetic energy is conserved."

Evidence (show the math): "Before: $KE_{\text{before}} = \frac{1}{2}(2\text{ kg})(3\text{ m/s})^2 + \frac{1}{2}(1\text{ kg})(0\text{ m/s})^2 = 9\text{ J}$."

"After: $KE_{\text{after}} = \frac{1}{2}(2\text{ kg})(1\text{ m/s})^2 + \frac{1}{2}(1\text{ kg})(4\text{ m/s})^2 = 1 + 8 = 9\text{ J}$."

Reasoning (explain the physics): "Since $KE_{\text{before}} = KE_{\text{after}} = 9\text{ J}$, kinetic energy was conserved. By definition, a collision is elastic if and only if kinetic energy is conserved. Therefore, this collision is elastic."

⚠️ Never skip the reasoning. A rubric worth 7 pts will award only 3-4 pts if you have claim + evidence but no reasoning. Reasoning shows mastery; calculation alone does not.

The Free Body Diagram Checklist

Every FRQ involving forces requires a clear FBD. Here's how to earn all points:

Checklist:

• ☐ Draw the object as a simple shape (dot or box).
• ☐ Draw every force acting on the object (not forces the object exerts).
• ☐ Label each force with its name or symbol: $N$ (normal), $F_g$ or $mg$ (gravity), $f$ (friction), $T$ (tension), $F_{\text{applied}}$ (applied force).
• ☐ If the object is on an incline or moving in 2D, resolve forces into components (parallel and perpendicular, or $x$ and $y$).
• ☐ Label component magnitudes if applicable (e.g., $mg\cos\theta$ for the perpendicular component of weight on an incline).
• ☐ Include a coordinate system (arrows for +x and +y direction).
• ☐ Don't draw action-reaction pairs; draw only forces on the system you're analyzing.

Example: Block on an incline with friction

        ↑ +y
        |
        | N
     /  |
    /   •--------→ +x
   /    |\ 
  /     | \
       f  mg sin θ
           ↓ mg cos θ

Label: $N =$ normal force (perpendicular to surface), $f =$ friction (up the slope), $mg\sin\theta =$ component of weight down the slope, $mg\cos\theta =$ component of weight into the surface.

Worked Example 1: Mathematical Routine (Kinematics)

Problem: A ball is thrown vertically upward from the ground with an initial speed of 20 m/s. Ignore air resistance. $g = 10\text{ m/s}^2$.

(a) What is the maximum height reached by the ball?

(b) What is the total time in the air?

(c) What is the velocity when the ball returns to the ground?

Solution:

(a) Maximum height

Setup & Claim: At maximum height, the velocity is zero. Using the kinematic equation $v^2 = v_0^2 - 2g\Delta h$ (note: gravity opposes upward motion):

$0 = (20)^2 - 2(10)\Delta h$ $400 = 20 \Delta h$ $\Delta h = 20\text{ m}$

Answer: The maximum height is 20 m.

Why this scores full points: Identified the key condition (v = 0 at max height), stated the physics principle (kinematic equation), set up the equation clearly, solved symbolically first, then substituted numbers.

(b) Total time in the air

Setup & Claim: The ball returns to ground level, so $\Delta y = 0$ for the entire trip. Using $\Delta y = v_0 t - \frac{1}{2}gt^2$:

$0 = 20t - \frac{1}{2}(10)t^2$ $0 = 20t - 5t^2$ $0 = t(20 - 5t)$

So $t = 0$ (initial) or $t = 4\text{ s}$ (final).

Answer: The total time in the air is 4 seconds.

Why this scores full points: Recognized that return to ground means $\Delta y = 0$, factored the quadratic (didn't just use the quadratic formula), interpreted the two solutions correctly.

(c) Velocity at ground level

Setup & Claim: Using $v = v_0 - gt$:

$v = 20 - 10(4) = 20 - 40 = -20\text{ m/s}$

The negative sign indicates downward direction.

Answer: The velocity is –20 m/s (or "20 m/s downward").

Why this scores full points: Calculated correctly and interpreted the sign. Noted that the magnitude is the same as the initial speed (expected by symmetry), and the direction is opposite.

Worked Example 2: Qualitative/Quantitative Translation (Energy Conservation)

Problem: A block of mass 2 kg starts at rest on a frictionless ramp of height 5 m. It slides down and compresses a spring at the bottom of the ramp by 0.5 m before coming to rest momentarily. Is the spring's elastic potential energy greater than the gravitational potential energy the block lost?

Use $g = 10\text{ m/s}^2$, $k = 1600\text{ N/m}$.

Solution (CER format):

Claim: "No, the spring's elastic potential energy is less than the gravitational potential energy lost by the block, because some energy was converted to heat due to the collision between the block and spring."

Wait — let me recalculate for a frictionless setup:

Revised Claim: "Actually, on a frictionless surface, the spring's elastic potential energy equals the gravitational potential energy lost, due to conservation of mechanical energy."

Evidence:

Gravitational PE lost: $\Delta PE_{\text{grav}} = mgh = 2 \times 10 \times 5 = 100\text{ J}$

Spring PE at maximum compression: $PE_{\text{spring}} = \frac{1}{2}kx^2 = \frac{1}{2}(1600)(0.5)^2 = \frac{1}{2}(1600)(0.25) = 200\text{ J}$

Reasoning:

This scenario reveals an inconsistency: the spring has more PE (200 J) than the block lost (100 J). This violates conservation of energy in a frictionless system.

Correction: Either (1) friction is present (and dissipated 100 J of energy), or (2) the problem parameters are inconsistent. Assuming a frictionless surface and that collision with the spring is elastic:

$PE_{\text{grav}} = PE_{\text{spring}} \rightarrow 100\text{ J} = \frac{1}{2}(1600)x^2 \rightarrow x^2 = 0.125 \rightarrow x \approx 0.35\text{ m}$

Final Answer: If frictionless and elastic, the spring compresses to 0.35 m, and the potential energies are equal, consistent with conservation of mechanical energy.

Why this scores points: Identified the principle (energy conservation), calculated both forms of PE, detected the inconsistency, and explained the physics correctly. The reasoning step elevated this from a pure calculation to a demonstration of mastery.

FRQ Test-Day Strategies

1. Read all 5 questions first. Identify which you're strongest on. Start there (confidence boost).
2. FBD before calculation. If you're stuck on a dynamics problem, draw an FBD. It clarifies the setup.
3. Partial credit is your friend. If you can't solve part (a), use a reasonable value for part (b). You'll earn points for the method.
4. "Explain" = CER. Always include claim, evidence (numerical), and reasoning (why it matters).
5. Don't erase; cross out. Graders see crossed-out work and might give partial credit if your final answer is wrong.
6. Check units on every final answer. Missing units = lost points.

Your Next Steps

1. Redo both worked examples above without looking at the solution.
2. Take a full practice FRQ set (5 questions, 90 min, timed).
3. Grade using the official rubric. Note where you lost points.
4. Return to the 7-day plan → or deep dives → for targeted review.

You've got this. Write clearly. Show your reasoning. Trust the rubric — it wants to give you points. 🎯