AP Physics 1 and AP Physics 2 are the two algebra-based AP physics courses, and they’re often confused — but they’re not alternatives, they’re a sequence. Physics 1 comes first (mechanics), Physics 2 second (electricity, magnetism, optics, modern physics). Since a recent redesign, they share the identical exam format, so the real differences are content, difficulty, and where each fits in your plan. This guide compares them head to head — content, format, difficulty, pass rates, and order — so you know exactly how they differ and which to take.
The quick answer: AP Physics 1 and AP Physics 2 are both algebra-based (no calculus), taken in sequence — Physics 1 first, Physics 2 second. Physics 1 covers mechanics (motion, forces, energy, momentum, rotation) plus fluids — first-semester college physics. Physics 2 covers thermodynamics, electricity and magnetism, optics, and modern physics — second-semester, more abstract, with a symbolic-reasoning emphasis. Physics 1 is a prerequisite (Physics 2’s units are numbered 9–15, continuing after Physics 1’s 8). Since the redesign, they share the identical format: ~3 hours, 40 MCQ/80 min + 4 FRQ/100 min, 50/50, hybrid digital. On difficulty: Physics 2’s content is a bit harder, but its pass rate is stronger (self-selection); Physics 1 was historically the lowest-scoring AP until a redesign raised its numbers. Here’s the full comparison.
For each exam in full, see the AP Physics 1 exam guide and the AP Physics 2 exam guide. Estimate a score for either with the AP score calculator.
What this guide covers
AP Physics 1 vs 2 at a glance
Before the detail, here’s the head-to-head that captures the essential differences and the key thing they share. Same structure, different content.
First-year mechanics
Second-year E&M & more
The single most important thing this table shows: both are algebra-based, share the identical exam format (since the redesign), and are meant to be taken in sequence — so the real differences are the content (mechanics vs. everything after mechanics) and the flavor of difficulty (Physics 1’s conceptual reasoning vs. Physics 2’s abstract content and symbolic reasoning). The unit numbering tells the story at a glance: Physics 1 is units 1–8, Physics 2 is units 9–15 — literally a continuation. The rest of this guide unpacks each dimension.
The key point: AP Physics 1 and 2 aren’t competing options — they’re a two-course sequence. Physics 1 (mechanics + fluids) is first-semester physics and comes first; Physics 2 (thermodynamics, E&M, optics, modern physics) is second-semester and builds on it. Both are algebra-based with the identical exam format; the difference is the content and the flavor of difficulty.
Why they’re a sequence, not a choice
The most common misconception is treating Physics 1 and 2 as either-or options — they’re not. One builds on the other.
The framing that trips people up is thinking of AP Physics 1 vs 2 as a choice between two alternatives. In reality, they’re a sequence: Physics 1 is the first-year introductory course, and Physics 2 is the second-year continuation that builds on it. Physics 1 is functionally a prerequisite for Physics 2. The clearest evidence is the unit numbering: in the recent redesign, the College Board renumbered Physics 2’s units to 9 through 15, continuing directly after Physics 1’s eight units — a deliberate signal that Physics 1 comes first and Physics 2 picks up where it leaves off. What Physics 1 provides that Physics 2 assumes: the foundational physics reasoning skills, problem-solving approaches, experimental and data-analysis practice, and mathematical comfort that Physics 2 builds on without re-teaching. So the practical implication is important: for most students, the path is Physics 1 first, then Physics 2 (often in consecutive years), not one or the other. That said, plenty of students take only Physics 1 and stop there — that’s a perfectly valid choice, especially if you just want one year of physics or Physics 1 satisfies your goals. The point isn’t that you must take both; it’s that if you take Physics 2, you should take Physics 1 first. The comparison in this guide is therefore less “which one should I pick?” and more “how do these two sequential courses differ, and how do I plan for them?” For each course in depth, see the Physics 1 and Physics 2 exam guides.
Content: mechanics vs. everything after
The biggest real difference between the two courses is what they actually cover. Tangible mechanics vs. abstract fields and more.
Content is where Physics 1 and 2 genuinely diverge. AP Physics 1 covers mechanics — the physics of motion, forces, energy, momentum, rotation, and oscillations — plus fluids (which moved into Physics 1 in the recent redesign). This is first-semester college physics, and it’s relatively tangible: you can picture blocks, ramps, collisions, and spinning objects. AP Physics 2 covers the second-semester topics: thermodynamics (heat, gases, entropy), electricity and magnetism (electric force and fields, circuits, magnetism, electromagnetic induction), optics (geometric and physical optics, waves), and modern physics (quantum, atomic, and nuclear physics). This content is generally more abstract — you’re reasoning about invisible fields and phenomena that don’t map onto everyday experience as directly as mechanics does. One redesign detail worth knowing: fluids used to be in Physics 2 but moved to Physics 1, and in exchange Physics 2’s optics and modern physics coverage was expanded. The tables below lay out each course’s topics. The upshot: if you like concrete, visualizable mechanics, Physics 1’s content may feel more intuitive; if you’re drawn to electricity, magnetism, and modern physics, Physics 2’s content will be the draw (though more abstract). Both demand genuine conceptual understanding, not formula memorization.
| Course | AP Physics 1 topics | AP Physics 2 topics |
|---|---|---|
| Core focus | Mechanics | Thermodynamics, E&M, optics, modern physics |
| Main units | Kinematics; forces & dynamics; work, energy & power; momentum; rotation; oscillations; fluids | Thermodynamics; electric force/field/potential; circuits; magnetism & induction; geometric optics; waves & physical optics; modern physics |
| College equivalent | First-semester algebra-based physics | Second-semester algebra-based physics |
| Feel | More tangible (blocks, ramps, motion) | More abstract (fields, magnetism, quantum) |
Format: now identical
Here’s the dimension where Physics 1 and 2 are the same — the recent redesign made their exams structurally identical. One format, two contents.
Thanks to the recent redesign that standardized the AP Physics exams, AP Physics 1 and AP Physics 2 now have the identical exam format. Both are about 3 hours, with two equally-weighted sections: a multiple-choice section of 40 questions in 80 minutes (50%) and a free-response section of 4 questions in 100 minutes (50%), plus a short break between. Both are hybrid digital — multiple choice in the Bluebook app, free response handwritten on paper. Both are algebra-based, provide a calculator and equation sheet on both sections, have no penalty for wrong multiple-choice answers, use partial credit on free response, and are scored 1–5. The four free-response questions on each test the same science-practice skills (mathematical routines, translation between representations, experimental design and analysis, and qualitative-quantitative translation). In other words, if you’ve taken one, the other will feel structurally identical on exam day — same timing, same section shapes, same digital/handwritten split, same longer free-response section. The only difference is the content you’re reasoning about. One shared note to keep evergreen: both exams have another timing change coming for May 2027 (affecting the multiple-choice count and section timing), so confirm the current format for your exam year. For the timing specifics of each, compare how long Physics 1 is and how long Physics 2 is.
| Format element | AP Physics 1 | AP Physics 2 |
|---|---|---|
| Total time | ~3 hours | ~3 hours |
| Multiple choice | 40 questions, 80 min, 50% | 40 questions, 80 min, 50% |
| Free response | 4 questions, 100 min, 50% | 4 questions, 100 min, 50% |
| Math level | Algebra-based (no calculus) | Algebra-based (no calculus) |
| Delivery | Hybrid digital (Bluebook + paper) | Hybrid digital (Bluebook + paper) |
| Calculator & equation sheet | Yes, both sections | Yes, both sections |
Difficulty and pass rates compared
This is where the comparison gets genuinely interesting, because the difficulty story isn’t as simple as it first looks. Harder content, higher pass rate.
Comparing difficulty requires separating content difficulty from pass rates, because they point in different directions. On content: AP Physics 2 is often considered a bit harder, because its topics (electricity and magnetism, modern physics) are more abstract than Physics 1’s mechanics, and it emphasizes symbolic reasoning. But on pass rates, the story flips in an interesting way. Historically, AP Physics 2 had a higher pass rate than Physics 1 — not because it’s easier, but because of self-selection: Physics 2 students already completed Physics 1 and chose to continue, making them a more prepared, physics-committed group. Meanwhile, AP Physics 1 was historically one of the lowest-scoring AP exams (its pass rate sat around 45%), because it’s taken by a much broader range of students. Here’s the crucial recent update: AP Physics 1 was redesigned and its pass rate rose substantially (to roughly two-thirds), which has narrowed the gap considerably. So the current picture is roughly: Physics 2 has somewhat harder, more abstract content, but both now have reasonably strong pass rates, with Physics 2’s still boosted by self-selection. The table summarizes. For an individual student, which feels harder depends on you — specifically, whether you find mechanics or abstract electricity, magnetism, and modern physics more intuitive. The deep dives are in is AP Physics 1 hard and is AP Physics 2 hard.
| Difficulty factor | AP Physics 1 | AP Physics 2 |
|---|---|---|
| Content difficulty | Conceptual reasoning on mechanics | More abstract (E&M, modern physics) + symbolic reasoning |
| Pass rate (3+) | Historically ~45%; redesign raised to ~66%+ | Strong, ~70%+ (self-selected pool) |
| Test-taking pool | Broad range of students | Smaller, self-selected (continued past Physics 1) |
| Main challenge | Conceptual multi-step reasoning; least self-studyable | Abstract content + deriving symbolic relationships |
| Reputation | Was “hardest AP,” redesign eased the numbers | Rated hard, but strong pass rate |
Which to take, and in what order
Turning the comparison into a decision, here’s how to think about taking one or both, and in what sequence. Physics 1 first, always.
Take Physics 1 first — always. It’s the prerequisite foundation (mechanics + reasoning skills) that Physics 2 builds on. Taking Physics 2 without Physics 1 (or equivalent first-year physics) means missing the base the course assumes.
Take Physics 2 if you want to continue. If you enjoyed Physics 1 and want more physics — especially for engineering, physical sciences, or medicine — Physics 2 covers the electricity, magnetism, and optics that are foundational for those fields. Usually taken the year after Physics 1.
Taking only Physics 1 is fine. If you want just one year of physics, or Physics 1 meets your goals, stopping there is perfectly valid. You don’t have to take both — but if you take Physics 2, do Physics 1 first.
Consider Physics C if you have calculus. If you’re a calculus-ready, engineering-bound student, AP Physics C (calculus-based) may be more directly relevant than the algebra-based sequence — though it requires calculus. More below.
The decision framework is simpler than for some AP pairs, precisely because Physics 1 and 2 are a sequence rather than alternatives. The core rules: Physics 1 comes first; Physics 2 is the optional continuation for students who want more physics; and taking only Physics 1 is a legitimate stopping point. Your interests and goals decide whether to continue to Physics 2 — if you’re STEM-bound and enjoyed the first year, continuing is valuable; if physics isn’t central to your plans, one year may be enough. Whichever you’re preparing for, you can estimate your score with the AP score calculator, and for planning your overall AP load, see how many AP exams to take.
Estimate your score with the AP score calculator, then dive into the full guides: Physics 1 format and practice, or Physics 2 format and practice. See the hardest AP exams too.
Where AP Physics C fits in
Any Physics 1 vs 2 comparison should mention the third option, since it changes the picture for some students. The calculus-based alternative.
Beyond the algebra-based Physics 1 and 2, there’s AP Physics C, which is worth knowing about because it’s a genuinely different track. AP Physics C is calculus-based and split into two separate courses/exams: Physics C: Mechanics and Physics C: Electricity and Magnetism. The key distinction: while Physics 1 and 2 use algebra and trigonometry, Physics C uses calculus, covering some of the same topics (mechanics; electricity and magnetism) but with greater mathematical depth and rigor. Physics C is generally considered the hardest of the AP physics options for students who know calculus, because of that mathematical demand. So how do you choose between the algebra-based sequence and Physics C? Broadly: the algebra-based Physics 1 and 2 are the right choice if you don’t have (or don’t want to use) calculus, or you want a broad conceptual introduction to physics — they’re taken by a wide range of students, including those not necessarily heading into physics or engineering. Physics C is often the better fit for calculus-ready students heading into engineering or the physical sciences, and some competitive STEM programs may prefer or expect it. It’s not unusual for students to take the algebra-based sequence first and Physics C later, or to choose based on their math readiness and intended major. The practical advice: if you have strong calculus and a clear engineering/physics direction, look into Physics C; otherwise, the algebra-based Physics 1 → Physics 2 sequence is an excellent path. (Note that AP Physics C was also recently restructured into two full-length exams.) For where all these land on difficulty, see the hardest AP exams.
AP Physics 1 vs 2: frequently asked questions
What is the difference between AP Physics 1 and AP Physics 2?
Both are algebra-based introductory physics courses (no calculus), taken in sequence, but they cover different content. AP Physics 1 covers mechanics, motion, forces, energy, momentum, rotation, oscillations, plus fluids, and is essentially first-semester college physics. AP Physics 2 covers the second-semester topics: thermodynamics, electricity and magnetism, optics, and modern physics. Physics 1 is functionally a prerequisite for Physics 2, which is why the Physics 2 units are numbered 9 to 15, continuing after Physics 1’s eight units. Since a recent redesign, the two exams have the identical format: about 3 hours, with 40 multiple-choice questions in 80 minutes (50%) and 4 free-response questions in 100 minutes (50%), both hybrid digital. So the main difference is the content, not the structure: Physics 1 is mechanics-focused and conceptual, while Physics 2 covers thermodynamics, electricity and magnetism, optics, and modern physics, which are more abstract, and it emphasizes symbolic reasoning.
Should I take AP Physics 1 or 2 first?
You should take AP Physics 1 first. AP Physics 1 is the first-year introductory course covering mechanics, and it is functionally a prerequisite for AP Physics 2, which covers second-semester topics like electricity, magnetism, and modern physics. This sequence is reflected in the course design: Physics 2’s units are numbered 9 to 15 to continue directly after Physics 1’s eight units, signaling that Physics 1 comes first. Physics 1 builds the foundational physics reasoning skills, problem-solving approaches, and mathematical comfort that Physics 2 assumes you already have. Taking Physics 2 without first taking Physics 1 (or an equivalent first-year physics course) would mean missing the mechanics foundation the course builds on. So the standard and recommended path is Physics 1 first, then Physics 2, usually in consecutive years. Some students take only Physics 1 and stop there, which is fine, but you generally shouldn’t take Physics 2 before Physics 1.
Is AP Physics 1 or 2 harder?
This is nuanced. In terms of content, AP Physics 2 is often considered a bit harder, because it covers more abstract topics (electricity and magnetism, modern physics) than Physics 1’s mechanics, and emphasizes symbolic reasoning. However, the pass rates tell a more complicated story. Historically, AP Physics 2 had a higher pass rate than Physics 1, not because it was easier, but because of self-selection: Physics 2 students already completed Physics 1 and chose to continue, so they’re a more prepared group. AP Physics 1 was historically one of the lowest-scoring AP exams, but a recent redesign raised its pass rate substantially, narrowing this gap. So the current picture is roughly: Physics 2 has somewhat harder, more abstract content, but both now have reasonably strong pass rates, with Physics 2’s boosted by self-selection. For an individual student, which feels harder depends on whether you find mechanics or abstract electricity, magnetism, and modern physics more intuitive.
Can I take AP Physics 2 without taking AP Physics 1?
Generally, you should take AP Physics 1 (or an equivalent first-year physics course) before AP Physics 2, because Physics 1 is functionally a prerequisite. AP Physics 2 assumes you have the mechanics foundation, physics reasoning skills, and problem-solving approaches that Physics 1 builds. The course design reflects this, with Physics 2’s units numbered 9 to 15 to follow Physics 1’s eight units. That said, requirements vary by school. Some schools require Physics 1 first; others may allow strong students to enter Physics 2 with a solid first-year physics background from another course. In practice, taking Physics 2 without any prior physics would be very challenging, since you’d lack the foundational reasoning and mathematical comfort the course builds on. If you’re considering skipping Physics 1, talk to your teacher or counselor about whether you have adequate preparation. For most students, the recommended path is Physics 1 first, then Physics 2.
Do colleges prefer AP Physics 1 or 2?
Colleges don’t generally prefer one over the other, since they serve different purposes and are typically taken in sequence rather than as alternatives. Taking both AP Physics 1 and AP Physics 2 demonstrates a sustained commitment to physics and covers a full year of algebra-based introductory physics, which is valuable for STEM-track students. For college credit, the two exams often correspond to different semesters of introductory physics, so a college may grant credit for first-semester physics for Physics 1 and second-semester physics for Physics 2, meaning both can be worth taking for credit purposes. What colleges care about more broadly is that you challenged yourself appropriately and did well. For students heading into engineering or the physical sciences, note that AP Physics C (calculus-based) is often more directly relevant and may be preferred or required for credit at some institutions, though it requires calculus. Always check the specific AP credit policies of the colleges you’re interested in.
Are AP Physics 1 and 2 the same length and format?
Yes. Since a recent redesign standardized the AP Physics exams, AP Physics 1 and AP Physics 2 have the identical length and format. Both are about 3 hours long, with two equally weighted sections: a multiple-choice section of 40 questions in 80 minutes (50%) and a free-response section of 4 questions in 100 minutes (50%), plus a short break in between. Both are hybrid digital exams, with the multiple-choice section completed digitally in the Bluebook app and the free-response section handwritten in a paper booklet. Both are algebra-based (no calculus), provide a calculator and equation sheet on both sections, and are scored 1 to 5. The four free-response questions on each test the same science-practice skills. So the two exams are structurally identical, the difference is entirely in the content: Physics 1 covers mechanics and fluids, while Physics 2 covers thermodynamics, electricity and magnetism, optics, and modern physics. Note that both exams have another timing change coming for May 2027.
The quick version
AP Physics 1 and AP Physics 2 aren’t competing options — they’re a two-course sequence, both algebra-based (no calculus). Physics 1 comes first, covering mechanics (motion, forces, energy, momentum, rotation) plus fluids — first-semester college physics. Physics 2 comes second, covering thermodynamics, electricity and magnetism, optics, and modern physics — second-semester, more abstract, with a symbolic-reasoning emphasis. Physics 1 is a prerequisite; the unit numbering makes it explicit (Physics 1 is units 1 to 8, Physics 2 is units 9 to 15). Since a recent redesign, the two exams share the identical format: about 3 hours, 40 multiple-choice questions in 80 minutes and 4 free-response questions in 100 minutes, split 50/50, hybrid digital. On difficulty, Physics 2’s content is a bit harder and more abstract, but its pass rate is stronger (around 70%+) thanks to self-selection, while Physics 1 was historically the lowest-scoring AP until a redesign raised its pass rate to around two-thirds. Take Physics 1 first; take Physics 2 if you want to continue; taking only Physics 1 is fine.
Dive into each exam: AP Physics 1 format and difficulty, or AP Physics 2 format and difficulty. Estimate your score with the free AP score calculator, see the hardest AP exams, or browse all education calculators.
Accuracy note: AP Physics 1 and AP Physics 2 course content, exam format, timing, unit structure, pass rates, and scoring are set by the College Board and change over time — both exams were recently redesigned, and the multiple-choice count and timing update again for May 2027. Pass rates change yearly, and difficulty is individual. This comparison reflects recent information for general informational purposes only. Always confirm current course requirements, exam formats, and college AP credit policies with the College Board’s official AP Physics pages and your target colleges before deciding.
The College Board’s AP Physics pages detail both courses, their exams, units, and the recent revisions. AP Physics courses & revisions →
The College Board’s AP Credit Policy Search shows how colleges award credit for each AP Physics exam. AP credit policy search →