Learn AP Physics
Free-body diagrams, conservation laws and the explanations AP Physics expects.
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AP Physics is really four separate courses. Physics 1 and Physics 2 are algebra-based: Physics 1 focuses on mechanics such as motion, forces, energy, momentum, rotation and oscillations, while Physics 2 covers areas like thermodynamics, electricity, magnetism, optics and modern physics. Physics C: Mechanics and Physics C: Electricity and Magnetism use calculus. All of them reward explaining physics in words, graphs and diagrams, not just plugging numbers into equations. Learnr is not affiliated with the College Board and builds a course on whichever one you choose.
How to learn AP Physics, step by step
- Pick the right course and get its framework. Physics 1 suits most first-time physics students, while the Physics C courses expect you to be taking or have taken calculus. Download the official course framework for your course so you study the units it actually includes.
- Master motion graphs early. Read position, velocity and acceleration graphs fluently, including what slopes and areas under curves mean. Kinematics reappears inside forces, energy and rotation, so a weakness here spreads into every later unit.
- Draw a free-body diagram for every force problem. Before writing any equation, sketch the object and every force acting on it, then choose your axes. Most dynamics errors come from a missing or doubled force, and exam questions sometimes ask for the diagram itself.
- Choose the right conservation law. Decide whether a problem is best solved with forces, energy or momentum. Practice spotting when mechanical energy is conserved, when momentum is conserved in a collision, and when friction or an outside force breaks either one.
- Explain in words and derive with symbols. Free-response questions often ask you to justify a claim in a short paragraph or derive an expression in symbols rather than numbers. Practice both with released questions and scoring guidelines from AP Central.
- Keep earlier units alive with spaced review. Short daily practice, such as Learnr's bite-sized lessons and streaks, keeps kinematics and forces fresh while you move on to rotation, waves or circuits.
What you'll learn
- Draw free-body diagrams and apply Newton's laws
- Solve problems with energy and momentum conservation
- Analyze rotational motion and simple harmonic oscillation
- Translate between equations, graphs and verbal descriptions
- Design and analyze simple physics experiments
What's inside your AP Physics course
A sample path Learnr builds for AP Physics. Your real course adapts to your goal and level.
- 1. Choosing your AP Physics course
- 2. Kinematics and motion graphs
- 3. Forces and Newton's laws
- 4. Energy, momentum and collisions
- 5. Rotation and oscillations
- 6. Experimental design and your course's remaining units
How long does it take to learn AP Physics?
Each AP Physics course runs a full school year. An exam review usually takes 4 to 8 weeks at 3 to 5 hours a week. Physics C goes faster for students already comfortable with derivatives and integrals, and slower for those learning calculus at the same time.
What you need before you start
Physics 1 and 2 need algebra and basic trigonometry. Physics C expects calculus, taken before or alongside the course. No earlier physics class is required for Physics 1.
Common mistakes to avoid
- Hunting for an equation that matches the given variables instead of understanding the situation. Start from a diagram and a physical principle.
- Assuming the normal force always equals the weight. It changes on inclines, in elevators and whenever other vertical forces act.
- Skipping the written explanation questions in practice. They carry real weight on the exam, so practice writing clear, concise justifications.
How Learnr builds your course
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AP Physics questions, answered
Which AP Physics course should I take first?
Most students start with AP Physics 1. If you are strong in calculus and heading toward engineering or physics, Physics C: Mechanics is a common choice. What your school offers and a teacher's advice matter too.
Are equation sheets provided in AP Physics?
Yes, each AP Physics exam provides an equation sheet. Check the current one on AP Central, since knowing what is on it tells you what to understand deeply rather than memorize.
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