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AP Physics 1 has 8 official units (updated for 2025-2026): (1) Kinematics, (2) Force and Translational Dynamics, (3) Work, Energy, and Power, (4) Linear Momentum, (5) Torque and Rotational Dynamics, (6) Energy and Momentum of Rotating Systems, (7) Oscillations, and (8) Fluids. Fluids was added as a new Unit 8 starting with the May 2025 exam. The exam has 40 MCQs (80 min) and 4 FRQs (100 min), both worth 50% of your score.
AP Physics 1 is a college-level, algebra-based course designed by the College Board and organized into 8 units that form the basis of all exam questions. Understanding how these units connect and their exam weight is key to effective preparation.
| Unit | Topic Name | Exam Weight (MCQ) |
| Unit 1 | Kinematics | 10–14% |
| Unit 2 | Force and Translational Dynamics | 18–23% |
| Unit 3 | Work, Energy, and Power | 18–23% |
| Unit 4 | Linear Momentum | 10–14% |
| Unit 5 | Torque and Rotational Dynamics | 10–14% |
| Unit 6 | Energy and Momentum of Rotating Systems | 5–8% |
| Unit 7 | Oscillations | 4–6% |
| Unit 8 | Fluids | 12–14% |
Units 2 and 3 make up about 36–46% of MCQs, so prioritize them. Also, don’t skip Unit 8 (Fluids) – it’s new and often overlooked.
| Resource Type | Description | Access |
| AP Physics 1 Units Summary PDF | Complete overview of all 8 AP Physics 1 units with updated exam weightage | Download |
| Unit-Wise Physics Notes | Concise notes for Kinematics, Forces, Energy, Momentum, Rotation, Oscillations, and Fluids | Download |
| AP Physics 1 Practice Tests | Full-length exam-style tests covering all units with real exam difficulty | Download |
| Unit Priority Study Guide | Strategy-based guide showing which units to study first for maximum score improvement | Download |
| AP Physics 1 Formula Sheet | Key formulas from all major units for quick revision | Download |
| FRQ Practice by Unit | Unit-wise free-response practice questions with exam-style structure | Download |
| AP Physics 1 Quick Revision Sheet | One-page revision summary of the most important concepts from all units | Download |
AP Physics 1 was redesigned for the May 2025 exam, so older prep materials are outdated. Here’s what changed and why it matters for your score:
| Change | Why It Matters |
| Fluids added (Unit 8) | New major topic (12–14% MCQs); older materials miss it |
| MCQs reduced (50 → 40) | Each question has higher weight |
| MCQ time reduced | Faster pace; fewer mistakes allowed |
| FRQs reduced (5 → 4) | More time per question |
| New FRQ types | Tests specific skills like design and translation |
| Multiselect removed | Only single-answer MCQs now |
| Hybrid digital format | MCQs on Bluebook, FRQs handwritten |
| Calculator allowed everywhere | Use it on both MCQs and FRQs |
| Rotational links increased | More mixed concept questions |
| Key Takeaway for 2026 Prep: The 2025 redesign produced dramatically better national results. The mean score rose to 3.12 (from 2.59 in 2024), and the pass rate jumped to 67.3% (from 47.3%). |
Kinematics is the study of motion without regard to its causes. This is the foundational unit – every subsequent unit builds on the vocabulary and representations introduced here. Students who struggle later in the course can almost always trace the problem back to gaps in kinematics.
| Topic Area | Key Concepts You Must Know |
| Scalars vs Vectors | Distance vs displacement, speed vs velocity, acceleration as a vector quantity |
| Equations of Motion | Three kinematic equations: ( v = u + at ), ( s = ut + \tfrac{1}{2}at^2 ), ( v^2 = u^2 + 2as ) |
| Uniformly Accelerated Motion | Motion with constant acceleration, free fall under gravity ( g ) |
| Motion in One Dimension | Straight-line motion, sign convention, relative motion in a line |
| Motion in Two Dimensions | Projectile motion, horizontal and vertical components, time of flight, range, maximum height |
| Relative Motion | Velocity of one object with respect to another, rain-man and boat-river problems |
| Graphs of Motion | Position-time, velocity-time, acceleration-time graphs and their interpretation |
| Instantaneous Quantities | Instantaneous velocity and acceleration using limits (conceptual understanding) |
| Exam tip: On a velocity-time graph, the area under the curve equals displacement. The slope equals acceleration. You must know this cold — it appears in nearly every AP Physics 1 exam. |
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This is the most heavily tested unit on the exam. Newton’s three laws of motion govern virtually everything in classical mechanics. If you had to choose one unit to master completely, this is it.
| Topic Area | Key Concepts You Must Know |
| Newton’s Laws of Motion | First law (inertia), second law ( F = ma ), third law (action-reaction pairs) |
| Free-Body Diagrams (FBDs) | Drawing and analyzing all forces acting on a body or system |
| Net Force and Acceleration | Relationship between net force, mass, and resulting acceleration |
| Friction | Static and kinetic friction, limiting friction, motion on rough surfaces and inclined planes |
| Types of Forces | Tension, normal force, weight, applied force, contact and non-contact forces |
| Circular Motion | Centripetal force ( F_c = \tfrac{mv^2}{r} ), motion in vertical and horizontal circles |
| Connected Systems | Pulley systems, blocks on surfaces, multi-body interactions |
| Center of Mass | Concept of center of mass and motion of systems of particles |
Exam Focus: Free-body diagrams appear in most questions—draw them quickly and accurately. Also master Newton’s Third Law (action-reaction pairs) and don’t confuse it with Newton’s Second Law.
Tied with Unit 2 as the most tested unit. Conservation of energy is one of the most powerful problem-solving tools in physics, and the exam tests it relentlessly – often in combination with Unit 2 force concepts.
Key Topics
| Topic Area | Key Concepts You Must Know |
| Work | ( W = F \cdot d \cdot \cos\theta ), positive, negative, and zero work |
| Kinetic Energy | ( KE = \tfrac{1}{2}mv^2 ) |
| Gravitational Potential Energy | ( PE = mgh ) |
| Elastic Potential Energy | ( PE = \tfrac{1}{2}kx^2 ) (spring systems) |
| Conservation of Mechanical Energy | ( KE_1 + PE_1 = KE_2 + PE_2 ) |
| Work-Energy Theorem | ( W_{\text{net}} = \Delta KE ) |
| Power | ( P = \tfrac{W}{t} = F \cdot v ) |
Exam Focus: Decide when to use energy conservation vs F=maF=maF=ma (or both). Use energy bar charts to track transfers, and always define the system and account for all energy in/out.
Momentum and impulse form one of the most testable conservation principles in the course. This unit also connects directly to Unit 3 through elastic and inelastic collision analysis.
Key Topics
| Topic Area | Key Concepts You Must Know |
| Linear Momentum | ( p = mv ), vector quantity depending on mass and velocity |
| Impulse | ( J = F \Delta t = \Delta p ), impulse-momentum theorem |
| Conservation of Momentum | Total momentum remains constant in isolated systems |
| Types of Collisions | Elastic (KE conserved), perfectly inelastic (objects stick), inelastic (partial KE loss) |
| Explosions | Reverse-collision problems using momentum conservation |
| Center of Mass Motion | Motion of system based on total mass and external forces |
Exam Focus: Momentum questions usually involve collisions or explosions – identify the system, check if it’s isolated, and apply conservation of momentum. Often, you’ll find velocity first, then use energy to determine distance.
This is the unit most students find hardest – and the most likely to separate strong students from average ones on the FRQ section. Rotational dynamics mirrors translational dynamics almost exactly, which is both the challenge and the shortcut.
| Topic Area | Key Concepts You Must Know |
| Torque | ( \tau = rF\sin\theta ), lever arm concept, clockwise vs counterclockwise direction |
| Rotational Inertia (Moment of Inertia) | ( I ) for point masses and standard shapes (ring, disc, rod, sphere) |
| Newton’s Second Law (Rotation) | ( \tau_{\text{net}} = I\alpha ) |
| Static Equilibrium | Conditions: ( \Sigma F = 0 ) and ( \Sigma \tau = 0 ) |
| Rotational Kinematics | Angular displacement, angular velocity ( \omega ), angular acceleration ( \alpha ) |
Exam Tip: Torque equilibrium (balanced beam) questions are common – choose the pivot strategically to simplify calculations. Also focus on rotational inertia, especially how it changes when mass is redistributed.
This unit extends Unit 3 and Unit 4 into rotational contexts. While the exam weight is lower, Unit 6 topics often appear in multi-part FRQs that begin with translational concepts and then require you to switch to rotational analysis
| Topic Area | Key Concepts You Must Know |
| Rotational Kinetic Energy | ( KE_{\text{rot}} = \tfrac{1}{2}I\omega^2 ) |
| Rolling Without Slipping | Combination of translational and rotational kinetic energy |
| Angular Momentum | ( L = I\omega ), for point mass ( L = mvr ) |
| Conservation of Angular Momentum | Total angular momentum remains constant in isolated systems |
| Torque and Angular Momentum | ( \tau_{\text{net}} = \dfrac{\Delta L}{\Delta t} ) |
Exam Focus: Conservation of angular momentum is key—when rotational inertia decreases, angular velocity increases (e.g., pulling arms inward). Also expect collision-based FRQs involving angular momentum and rotational kinetic energy.
Oscillations has the lowest exam weight, but the questions it generates are precise and specific. Students who skip this unit often lose points on questions they could have answered easily with a few hours of focused study.
| Topic Area | Key Concepts You Must Know |
| Simple Harmonic Motion (SHM) | Definition, restoring force, conditions for SHM |
| Mass-Spring System | Period ( T = 2\pi \sqrt{\tfrac{m}{k}} ), frequency dependence |
| Simple Pendulum | Period ( T = 2\pi \sqrt{\tfrac{L}{g}} ) (small angle approximation) |
| Energy in SHM | Continuous transfer between kinetic and potential energy |
| Amplitude, Period, Frequency | Effect of mass, spring constant, and length on motion |
Exam Focus: SHM questions test how period changes with mass, length, or spring constant, along with calculations using period formulas and energy conservation to find velocity.
Fluids is the most important new addition to AP Physics 1. It was transferred from AP Physics 2 in 2025, and many prep resources still omit it entirely. With 12–14% exam weight, skipping this unit can cost you an entire letter grade.
| Topic Area | Key Concepts You Must Know |
|---|---|
| Fluid Pressure | ( P = \rho gh ), pressure increases with depth |
| Gauge vs Absolute Pressure | Difference between atmospheric, gauge, and absolute pressure |
| Pascal’s Law | Pressure applied to a fluid is transmitted equally in all directions |
| Archimedes’ Principle | ( F_b = \rho_{\text{fluid}} \cdot V_{\text{displaced}} \cdot g ) |
| Floating and Sinking | Comparison of object density with fluid density |
| Continuity Equation | ( A_1 v_1 = A_2 v_2 ) (conservation of mass flow) |
| Bernoulli’s Equation | ( P + \tfrac{1}{2}\rho v^2 + \rho gh = \text{constant} ) |
| Topic Area | Key Concepts You Must Know |
| Fluid Pressure | ( P = \rho gh ), pressure increases with depth |
| Gauge vs Absolute Pressure | Difference between atmospheric, gauge, and absolute pressure |
| Pascal’s Law | Pressure applied to a fluid is transmitted equally in all directions |
| Archimedes’ Principle | ( F_b = \rho_{\text{fluid}} \cdot V_{\text{displaced}} \cdot g ) |
| Floating and Sinking | Comparison of object density with fluid density |
| Continuity Equation | ( A_1 v_1 = A_2 v_2 ) (conservation of mass flow) |
| Bernoulli’s Equation | ( P + \tfrac{1}{2}\rho v^2 + \rho gh = \text{constant} ) |
Exam Focus: Buoyancy (Archimedes’ Principle) is heavily tested in FRQs, along with Bernoulli’s applications like pressure drop over wings and increased speed in narrow pipes. Expect at least one fluids FRQ.
| Component | Details | Timing / Notes |
| Section I: Multiple Choice | 40 Questions | 80 minutes | 50% of score |
| Section II: Free Response | 4 Questions | 100 minutes | 50% of score |
| Calculator | Permitted | Both sections; graphing calculator allowed |
| Reference Sheet | Provided | Equations sheet provided for both sections |
| Format | Hybrid Digital | MCQs in Bluebook app; FRQ answers handwritten |
Every FRQ on the AP Physics 1 exam now falls into one of four defined categories. Knowing what each type asks you to do lets you prepare specifically:
| FRQ Type | What It Tests |
| Mathematical Routines (MR) | Calculations, equations, and step-by-step problem solving |
| Translation Between Representations (TBR) | Converting between graphs, equations, diagrams, and descriptions |
| Experimental Design (ED) | Designing experiments, identifying variables, and analyzing errors |
| Qualitative/Quantitative Translation (QQT) | Linking concepts with calculations (why + how much) |
FRQ Pacing: You have 100 minutes for 4 questions (~25 min each). Don’t spend more than 30 minutes on one. If stuck, skip and continue—later parts often earn points independently.
The 2025 AP Physics 1 redesign produced the most dramatic improvement in national pass rates in the exam’s history. Here is the official score distribution data:
| Score | Approx. % of Students (2025) | What It Means |
| Score 5 | ~20% | Extremely Well Qualified – credit at nearly all colleges |
| Score 4 | ~22% | Well Qualified – credit at most colleges |
| Score 3 | ~25% | Qualified – minimum for credit at many schools |
| Score 2 | ~20% | Possibly Qualified – limited college credit |
| Score 1 | ~13% | No Recommendation – no college credit |
College Credit Reality Check: A score of 3 is passing, but top schools like MIT, Stanford, Caltech, and Carnegie Mellon typically require a 4 or 5 for physics credit. Always check each college’s AP credit policy.
| Question: A 5 kg block is pushed across a horizontal floor by a 30 N horizontal force. The coefficient of kinetic friction is 0.2. What is the acceleration of the block? (g = 10 m/s²) |
| FRQ Grader Note: You must draw the free-body diagram and label every force with both direction and magnitude. An FBD with unlabeled forces earns zero points for that part, even if your algebra is correct. |
| Question: A 2 kg object is released from rest at the top of a frictionless ramp 5 m high. What is the speed of the object at the bottom? (g = 10 m/s²) |
| Note: Mass cancels in energy conservation problems on frictionless surfaces. The answer does not depend on the object’s mass. If a question gives you mass but asks only for final speed on a frictionless ramp, that mass information is irrelevant – a common exam trick. |
| Question: A uniform 4 m beam (mass 20 kg) is supported at its left end by a hinge and by a vertical rope attached 1 m from the right end. What is the tension T in the rope? (g = 10 m/s²) |
| Strategy: Always choose your pivot at the point where an unknown force acts. This makes that force’s torque zero and removes it from the equation entirely. |
| Question: A solid aluminum sphere (density 2700 kg/m³, mass 0.81 kg) is fully submerged in water (ρ = 1000 kg/m³). (a) Find the buoyant force on the sphere. (b) What is the net force on the sphere, and in which direction does it accelerate? |
| Physics insight: Aluminum sinks because its density (2700 kg/m³) exceeds water (1000 kg/m³). The buoyant force is real and significant — it reduces the apparent weight of the submerged object by 3 N. This is directly measurable with a spring scale. |
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Not all units give you equal exam value per hour of study time. Here is how to allocate your time if you are preparing over 8+ weeks, 4 weeks, or just 1 week before the exam:
| Priority Order | Unit | Why This Priority |
| Units 2 & 3 | Forces + Energy | Highest. 36–46% of MCQ combined. Master these first and last. |
| Unit 8 | Fluids | Very High. New topic. 12–14% weight. Almost no competition in older prep books. |
| Units 1 & 4 | Kinematics + Momentum | High. 10–14% each. Foundational; also appears embedded in other units. |
| Unit 5 | Rotational Dynamics | High FRQ impact. Often the hardest unit. Likely appears as an FRQ. |
| Unit 6 | Rotating Systems Energy | Medium. Usually appears as part of a Unit 5/6 combined FRQ. |
| Unit 7 | Oscillations | Lower weight (4–6%) but easy to study. High points-per-hour if skipped. |
Q: How many units does AP Physics 1 have in 2026?
For the school year 2025–2026, AP Physics 1 will have 8 units. The May 2025 exam added Unit 8 (Fluids), which came from AP Physics 2. There are eight units: Kinematics, Force and Translational Dynamics, Work/Energy/Power, Linear Momentum, Torque and Rotational Dynamics, Energy and Momentum of Rotating Systems, Oscillations, and Fluids.
Q: What AP Physics 1 units are on the exam?
All 8 units appear on the AP Physics 1 exam. Units 2 (Force and Translational Dynamics) and 3 (Work, Energy, and Power) are weighted highest at 18–23% each. Unit 8 (Fluids) accounts for 12–14%. Every unit is fair game for both MCQ and FRQ questions.
Q: Which AP Physics 1 unit is the hardest?
A lot of students and teachers say that Unit 5 (Torque and Rotational Dynamics) is the hardest to understand. Students usually get the lowest scores on the FRQ section when they have to answer questions about rotational inertia, torque, and rotational equilibrium. Unit 8 (Fluids) is also hard because it’s new to AP Physics 1 and a lot of students haven’t learned about it before.
Q: Is AP Physics 1 hard?
In the past, AP Physics 1 had one of the lowest pass rates of all AP tests. In 2024, only 47.3% of students passed. The 2025 redesign, on the other hand, made things much better. In 2025, 67.3% of students got a 3 or higher. The test values clear written explanations and conceptual reasoning more than just doing math. This means that structured, planned preparation is more useful here than in almost any other AP class.
Q: Does AP Physics 1 require calculus?
No. AP Physics 1 is explicitly algebra-based. You need strong algebra, geometry, and basic trigonometry (sin, cos, tan). Calculus is not required or assumed. AP Physics C: Mechanics and AP Physics C: Electricity and Magnetism are the calculus-based AP physics options.
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