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AP Physics 2: Algebra-Based Study Guide (2026)
Last reviewed: 2026-06-10
AP Physics 2: Algebra-Based is the second half of the College Board's algebra-based physics sequence. Where AP Physics 1 lives in mechanics, fluids, and energy, Physics 2 moves into the rest of the discipline: thermodynamics, electric fields and circuits, magnetism and electromagnetic induction, geometric and physical optics, waves and sound, and modern physics. The course is built around three science practices — creating representations, mathematical routines, and scientific questioning and argumentation — so the exam rewards students who can draw a correct field diagram or PV diagram as much as those who can crunch numbers.
The exam itself runs three hours: a 40-question multiple-choice section in 80 minutes, then four free-response questions in 100 minutes. Each section counts for half of your score, and you get a calculator plus the official equation sheet for the entire exam. That equation sheet is a trap for the unprepared — it hands you Coulomb's law and the thin-lens equation, but it will not tell you when an image is virtual, which way an induced current flows, or whether work is done on or by a gas.
This guide walks through all seven units in the current Course and Exam Description, flags what the exam actually tests from each, and lays out a study plan grounded in retrieval practice and spaced repetition rather than passive rereading.
AP Physics 2: Algebra-Based Exam Format
The AP Physics 2: Algebra-Based exam is 3 hrs long and has 2 sections:
| Section | Format |
|---|---|
| Section I | 60 MCQs (90 min) |
| Section II | 6 FRQs (90 min) |
Both sections are worth 50%, the exam is scored 1-5, and there is no penalty for wrong answers — never leave a multiple-choice question blank. The 40 MCQs in 80 minutes give you two minutes each, and many are stimulus-based: a PV diagram, a circuit schematic, a ray diagram, or a data table that several questions share. Practice reading those representations fast. When a question asks how doubling a radius changes Coulomb force or how adding a parallel resistor changes total current, reason proportionally from the equation sheet instead of plugging in numbers.
The four FRQs follow set task models: a mathematical routines question, a translation-between-representations question, an experimental design and analysis question, and a qualitative/quantitative translation question. The experimental design FRQ is the most coachable — learn the template of identifying measured quantities, the equipment to measure them, and how to linearize data (plot 1/d_i versus 1/d_o, or V versus I). On paragraph-length responses, graders reward a coherent causal chain: flux changes, therefore an emf is induced, therefore current flows opposing the change.
Who Should Take AP Physics 2: Algebra-Based?
Take AP Physics 2 if you finished AP Physics 1 (or an equivalent intro physics course) and want the full first-year physics sequence on your transcript — together the two courses mirror a complete algebra-based college physics year, the standard requirement for pre-med, biology, chemistry, and many health-science majors. A 4 or 5 frequently earns credit for the second semester of general physics at colleges that accept algebra-based credit. Difficulty-wise, the math stays at algebra and trig, but the concepts get more abstract than Physics 1: invisible fields, induced currents, photon energies. Students who liked the reasoning in Physics 1 usually find Physics 2 rewarding; students who survived Physics 1 on formula-matching tend to struggle.
AP Physics 2: Algebra-Based Units: What to Study
Unit 1: Thermodynamics
15-18% of examThis unit connects the microscopic kinetic theory of gases to macroscopic variables you can measure. You will use the ideal gas law PV = nRT, relate temperature to average kinetic energy of molecules, and track energy transfer by conduction, convection, and radiation. The centerpiece is the first law of thermodynamics — the change in a gas's internal energy equals heat added plus work done on the gas — applied to isothermal, isobaric, isochoric, and adiabatic processes on PV diagrams. The exam loves PV-diagram reasoning: identifying where work is positive, comparing heat absorbed along different paths between the same two states, and ranking internal energy changes. The second law appears through entropy and the irreversibility of heat flowing from hot to cold, often framed probabilistically.
Key topics
- Ideal gas law and kinetic theory
- First law of thermodynamics
- PV diagrams and work on a gas
- Isothermal, isobaric, isochoric, adiabatic processes
- Conduction, convection, radiation
- Heat capacity and thermal equilibrium
- Entropy and the second law
Unit 2: Electric Force, Field, and Potential
15-18% of examElectrostatics starts with charge itself: it is conserved, quantized in units of the elementary charge, and moves differently through conductors and insulators, which explains charging by friction, conduction, and induction. Coulomb's law gives the force between point charges, and the field concept generalizes it — you must draw and interpret field vectors and field-line diagrams for point charges and parallel plates. The unit then layers on energy: electric potential energy of charge configurations, electric potential V = kq/r, and equipotential lines that always cross field lines at right angles. Exam questions hinge on the distinctions students blur — field versus force, potential versus potential energy — and on superposition: finding where the net field or potential from two charges is zero.
Key topics
- Charge conservation and quantization
- Charging by induction and conduction
- Coulomb's law
- Electric field diagrams and superposition
- Electric potential energy
- Electric potential and equipotential lines
- Conductors versus insulators
Unit 3: Electric Circuits
15-18% of examThis unit turns potential difference into moving charge. You will define current, compute resistance from resistivity, length, and cross-sectional area (R = ρL/A), and apply Ohm's law where it holds — while recognizing non-ohmic elements like light bulbs whose resistance changes with temperature. Kirchhoff's junction rule (charge conservation) and loop rule (energy conservation) anchor the analysis of series, parallel, and combination circuits, including batteries with internal resistance. Capacitors enter here: capacitance, energy storage, and the behavior of RC circuits immediately after a switch closes versus at steady state, when a fully charged capacitor acts like an open switch. Expect ranking tasks — which bulb is brightest, what happens to ammeter readings when a resistor is removed — and an experimental-design favorite: determining resistivity from a V-I graph.
Key topics
- Current, resistance, and resistivity
- Ohm's law and non-ohmic behavior
- Kirchhoff's loop and junction rules
- Series and parallel combinations
- Internal resistance and terminal voltage
- Power dissipation P = IV
- Capacitors and steady-state RC circuits
Unit 4: Magnetism and Electromagnetism
12-15% of examMagnetism is the most right-hand-rule-dependent unit on the exam. You will map fields of permanent magnets and current-carrying wires, then compute forces: F = qvB sinθ on a moving charge and F = BIℓ sinθ on a current-carrying wire, with direction from the right-hand rule (reversed for negative charges). Charged particles in uniform fields travel in circles, linking back to circular-motion reasoning from Physics 1. The second half is electromagnetic induction: magnetic flux through a loop, Faraday's law relating induced emf to the rate of flux change, and Lenz's law giving the direction of induced current that opposes that change. FRQs routinely ask you to argue in words why a current is induced as a loop enters a field region, and which way it flows — direction errors are the classic point-loser here.
Key topics
- Magnetic fields of currents and magnets
- Right-hand rules
- Force on moving charges (qvB)
- Force on current-carrying wires
- Charged-particle circular motion
- Magnetic flux and Faraday's law
- Lenz's law and induced current direction
Unit 5: Geometric Optics
12-15% of examGeometric optics treats light as rays. Reflection from plane and curved mirrors and refraction at boundaries — governed by Snell's law, n₁sinθ₁ = n₂sinθ₂ — explain everything from why a pool looks shallow to fiber-optic cables, via total internal reflection beyond the critical angle. The core skill is image formation: drawing principal-ray diagrams for concave and convex mirrors and converging and diverging lenses, then confirming with the thin-lens/mirror equation 1/f = 1/d₀ + 1/dᵢ and magnification m = -dᵢ/d₀. You must classify images as real or virtual, upright or inverted, enlarged or reduced, and track how the image moves as the object slides toward the focal point. The lab-design FRQ frequently asks you to find a focal length by graphing 1/dᵢ against 1/d₀.
Key topics
- Law of reflection and plane mirrors
- Snell's law of refraction
- Total internal reflection and critical angle
- Ray diagrams for mirrors and lenses
- Thin-lens and mirror equation
- Real versus virtual images
- Magnification
Unit 6: Waves, Sound, and Physical Optics
12-15% of examIn the revised course, all of waves and sound lives in Physics 2. You will describe transverse and longitudinal waves with amplitude, wavelength, frequency, and speed (v = fλ), then build on superposition: constructive and destructive interference, beats from two close frequencies, and standing waves on strings and in open and closed tubes, where boundary conditions fix the allowed harmonics. The Doppler effect explains pitch shifts qualitatively. Physical optics then treats light as a wave: Young's double-slit experiment and diffraction gratings produce interference patterns governed by path-length differences (d sinθ = mλ), single slits diffract, and thin films interfere depending on film thickness and phase changes at reflection. Expect questions comparing how pattern spacing changes with wavelength, slit separation, or the medium.
Key topics
- Wave speed, frequency, wavelength
- Superposition and interference
- Standing waves in strings and tubes
- Beats and the Doppler effect
- Double-slit interference
- Diffraction gratings and single-slit diffraction
- Thin-film interference
Unit 7: Modern Physics
12-15% of examThe course closes where classical physics breaks down. The photoelectric effect — electrons ejected only above a threshold frequency regardless of intensity — forces the photon model, with photon energy E = hf and the work function setting the cutoff. Matter returns the favor: de Broglie's λ = h/p gives particles a wavelength, confirmed by electron diffraction, completing wave-particle duality. Atomic models culminate in discrete energy levels, where electron transitions absorb or emit photons whose energies match level differences, producing emission and absorption spectra. Nuclear physics covers the strong force, mass-energy equivalence E = mc² and binding energy, conservation of charge and nucleon number in alpha, beta, and gamma decay, half-life reasoning, and fission versus fusion. Exam items often blend units — a photon's wavelength feeding a double-slit calculation.
Key topics
- Photoelectric effect and work function
- Photon energy E = hf
- De Broglie wavelength
- Wave-particle duality
- Atomic energy levels and spectra
- Mass-energy equivalence
- Radioactive decay and half-life
How to Study for AP Physics 2: Algebra-Based
Study the units in order, because the course is cumulative in disguise. Thermodynamics stands mostly alone, but Units 2 through 4 form a chain: fields explain potential, potential difference drives circuits, and moving charges create the magnetism that closes the loop with induction. Optics splits across Units 5 and 6 — master ray-model geometric optics before wave-model physical optics so the contrast between the two models of light is sharp. Modern physics then leans on both: photon energy connects to potential difference (electron-volts), and de Broglie wavelengths feed interference math from Unit 6.
Replace rereading with retrieval. After each topic, close the book and reproduce the core representation from memory: a labeled PV diagram for each process type, a field-line map for two opposite charges, a ray diagram for an object inside a lens's focal length. Then check, correct, and schedule the next review. MaxYourScore's unit quizzes and SM-2 spaced-repetition engine handle that scheduling automatically — questions you miss on induced-current direction come back in days, ones you nail come back in weeks. Interleave old units into every session; a Friday mixing circuits, Snell's law, and half-life problems beats a Friday of only circuits.
On timeline: if you start in the fall, one unit every three to four weeks leaves all of April for full practice exams. Starting in January, run two units per month and protect the final three weeks for mixed review. Either way, take at least three timed practice exams, and grade your own FRQs against real College Board rubrics from past exams — you will discover that the points come from justifications (citing flux change, energy conservation, or a path-length difference), not from final numbers. The last week, drill the equation sheet: know where every formula lives and what its symbols mean.
AP Physics 2: Algebra-Based FAQ
Is AP Physics 2: Algebra-Based hard?
It is conceptually harder than AP Physics 1 but mathematically similar — algebra and trig only, no calculus. The difficulty comes from abstraction: invisible electric and magnetic fields, induced currents, photons. Students who reason from diagrams and proportions do well; students who hunt for a formula to plug into struggle, because the exam deliberately writes questions the equation sheet alone cannot answer.
Do I need AP Physics 1 before AP Physics 2?
The College Board recommends completing AP Physics 1 or a comparable introductory physics course first, plus precalculus (taken before or concurrently). Physics 2 assumes you can already handle forces, energy conservation, and circular motion — magnetism, for instance, reuses circular-motion reasoning directly. Skipping Physics 1 is technically possible but rarely advisable.
What is the difference between AP Physics 2 and AP Physics C: Electricity and Magnetism?
AP Physics 2 is algebra-based and broad: thermodynamics, E&M, optics, waves, and modern physics. AP Physics C: E&M is calculus-based and narrow, going much deeper into just electricity and magnetism with tools like Gauss's law. Pre-med and life-science students typically want Physics 2; engineering and physics majors typically want Physics C.
How long is the AP Physics 2 exam and what is on it?
Three hours total. Section I is 40 multiple-choice questions in 80 minutes; Section II is 4 free-response questions in 100 minutes, including an experimental design question and a qualitative/quantitative translation question. Each section is worth 50% of the composite, a calculator is allowed throughout, and the official equation sheet is provided.
What percent do you need for a 5 on AP Physics 2?
There is no fixed published percentage. The exam is scored 1-5 from a composite of the multiple-choice and free-response sections, and the cut points are set after each administration, varying slightly year to year. Practically, you do not need anywhere near a perfect raw score for a 5 — consistent partial credit on all four FRQs plus solid MCQ accuracy is the realistic path.
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