AP Physics 1
AP Physics 1 FRQ Tips: How to Write Answers That Actually Score
days until your AP Physics 1 exam
Wed, May 6 · Afternoon session
How the AP Physics 1 FRQ points are scored
Five FRQs: experimental design, qualitative/quantitative translation, and short answer. Physics 1 rewards explanation as much as math. A correct number with no reasoning often scores less than correct reasoning with a slightly off number.
Points per FRQ type
Suggested time budget · 100 min
Experimental Design
12 pt · 25 minPropose a procedure, identify variables, predict results with reasoning.
Quantitative/Qualitative Translation
12 pt · 25 minTranslate between a graph, equation, and verbal description.
Short Answer (×3)
21 pt · 50 minConceptual reasoning with a free-body diagram, equation, or comparison.
Exam composite weighting
5 FRQs carry the same weight as 50 MCQs
Decode the task word before you write
Every AP FRQ begins with a task word. It tells you the minimum sentence type required for the point. Writing too much costs time; writing the wrong kind costs the point outright.
Want to know if you're actually doing this?
Write one AP Physics 1 FRQ. Get your reasoning, equations, and final answer scored line by line.
Weak vs. strong: conceptual reasoning
Physics 1 short FRQs reward explanation, not just calculation. A correct answer with no reasoning earns half credit at best.
Prompt
A block slides down a frictionless ramp from rest. Compare the block's speed halfway down the ramp to its speed at the bottom. Justify your answer using energy conservation.
Weak answer
"The block is faster at the bottom because it falls farther and gains more speed."
Why it lost points
- No reference to energy conservation - the prompt requires it.
- No equation relating KE and PE.
- 'Gains more speed' is circular - doesn't explain WHY.
Strong answer
"By conservation of mechanical energy on a frictionless ramp, mgh = ½mv². At half the height, v_half = √(gh), and at the bottom, v_bottom = √(2gh). Therefore v_bottom / v_half = √2, so the block is √2 ≈ 1.41 times faster at the bottom than halfway down - not twice as fast, which is a common intuitive error."
Why it scores full marks
- Names the principle (conservation of mechanical energy) and writes the equation.
- Derives both speeds symbolically before comparing.
- Flags the common misconception explicitly - extra credit territory.
Weak vs. strong: free-body diagram
FBDs are a scoring row. Readers award credit for correct vectors with correct labels - even when the rest of the FRQ has errors.
Prompt
A 2.0 kg box rests on an incline at 30° above horizontal. The coefficient of static friction is 0.40. Draw a free-body diagram and determine whether the box will remain at rest.
Weak answer
"Gravity pulls the box down. Friction holds it in place. The box stays still because friction is strong enough."
Why it lost points
- No FBD drawn or described.
- No calculation comparing required friction to maximum static friction.
- No angle-dependent force components.
Strong answer
"FBD: Weight mg acts straight down (19.6 N). Normal force N acts perpendicular to the incline. Static friction f_s acts along the incline, opposing sliding. Component of gravity along incline: mg sin(30°) = 9.8 N. Maximum static friction: μ_s · N = 0.40 × mg cos(30°) = 0.40 × 16.97 = 6.79 N. Since required friction (9.8 N) exceeds maximum static friction (6.79 N), the box slides."
Why it scores full marks
- Names all three forces (weight, normal, friction) with correct directions.
- Decomposes gravity into incline-parallel and -perpendicular components.
- Compares required friction to maximum static friction - the decisive step.
What you see in GradGPT
This is what your feedback looks like
Every Physics 1 FRQ you write gets scored against the same rubric AP readers use. Strengths, improvements, and notes are highlighted inline.
Your response
The block goes faster at the bottom because of gravity. Using mgh = ½mv², v = √(2gh). At half the height v is smaller. So the block speeds up the whole way.
Inline feedback
Rubric breakdown
You scored higher than 63% of students on this prompt
Principle named
1/1
Energy conservation equation present
Symbolic derivation
1/2
Half-height speed not explicit
Final comparison
0/1
No numerical ratio given
Get this on your own answer.
The 5 FRQ patterns that cover AP Physics 1
Every AP Physics 1 FRQ fits one of these. Recognize the pattern and you know the moves before you start.
Experimental design
Propose a procedure, identify variables, make a prediction. Readers reward specificity.
- Name the IV, DV, and control in one sentence.
- State the relationship you expect (linear, inversely proportional, quadratic).
Free-body diagram
Every force as a labeled vector from a single point. Missing or misdirected arrows lose credit.
- Always decompose gravity on inclines before anything else.
- Label each vector with its name (W, N, f_s, T) - not just an arrow.
Conservation of energy / momentum
'Justify using conservation of…' prompts. The principle must be named AND applied.
- Write the conservation equation at the top of your work.
- Identify initial and final states explicitly.
Graph interpretation
Position-time, velocity-time, force-time. Slope and area under the curve are the key moves.
- Identify what slope represents (velocity, acceleration, force).
- Identify what area represents (displacement, impulse, work).
Qualitative reasoning
'Explain why' or 'Compare' prompts with no calculation required. Readers want physics principles, not analogies.
- Name the principle first (Newton's 3rd law, impulse-momentum theorem).
- Apply it to the specific objects in the prompt.
The mistakes that quietly cost points
These show up every year. Each one is a single habit - fix the habit and you bank points.
Skipping the free-body diagram. It's almost always a scoring row, and it's the fastest credit to earn.
Giving only a number when the prompt says 'justify' or 'explain.' Words earn credit too - sometimes more than the math.
Confusing mass and weight. W = mg. m is in kg; W is in N.
Forgetting to decompose forces on inclines. Always resolve along and perpendicular to the incline before applying Newton's second law.
Using g = 10 when the prompt gives 9.8 (or vice versa). Use the exact value given - it matters for the final sig fig.
Answering with a formula when the prompt asks for a comparison. 'v_bottom / v_half = √2' is the answer readers want - not 'v = √(2gh).'
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Your first FRQ scored against the real AP Physics 1 rubric.
Frequently Asked Questions
Five. One experimental design, one qualitative/quantitative translation, and three short answers. You get 100 minutes total - roughly 25 minutes each for the long FRQs and 15 minutes each for short answers.
Use whatever value the prompt gives. If none is specified, g = 9.8 m/s² is the standard. Using a different value than what the prompt states can cost sig-fig points.
Yes. Conceptual reasoning is a separate scoring row on most Physics 1 FRQs. A correct explanation with an arithmetic error often scores higher than a correct number with no reasoning.
All forces labeled (W or mg, N, T, f, F_applied), arrows starting from a single point on the object, correctly directed. You don't need to draw the object itself - just the force vectors.
Answering the prompt with only numbers. Every 'justify,' 'explain,' or 'compare' prompt requires words. A physics answer without a sentence is an incomplete answer.
50/50. Five FRQs carry the same weight as 50 multiple-choice questions. FRQs are where most students have the most room to grow - making them the highest-leverage prep.
Write one Physics 1 FRQ. See exactly where you lost points.
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