Free AP Physics help

AP Physics help you can grab with your hands

Guides that answer the question you searched, calculators that show every step, and draggable simulations, all built for the current AP Physics courses.

Build my study planTry the projectile launcher
angle 45°range 40.8 mmax height 10.2 m
010203040 m45°
Speed is fixed at 20 m/s. Drag toward 45° and watch the range peak; angles that add to 90°, like 30° and 60°, land in the same spot.

Put this launcher on a class page

Built for the current AP Physics courses

College Board rewrote all four AP Physics course descriptions effective Fall 2024. Every course page here is transcribed from the current official documents, not the versions most of the web still describes.

Answers, not lectures

All guides
Kinematic Equations: The 4 Formulas and When to Use EachWhich equation fits which problem, and the one question that picks it every time.How to Solve Projectile Motion ProblemsSplit the motion into x and y and the hardest kinematics problems become two easy ones.How to Draw a Free-Body DiagramThe five-step routine, the forces students invent by mistake, and the arrows graders look for.How to Find Normal ForceFlat ground, ramps, and elevators, and why N is not always mg.Conservation of MomentumWhen momentum is conserved, when it is not, and how to set up any collision.Is AP Physics 1 Hard?What the pass rates actually say, before and after the 2024 redesign.

Calculators that show their work

All calculators

Every tool pairs the number you need with the steps behind it, so the homework answer comes with the understanding the exam requires.

Projectile motion calculatorRange, max height, and time of flight, with every step in between.Kinematics calculatorEnter any three of the five motion quantities; it solves the rest and shows which equation it used.Net force calculatorAdd force vectors, get the resultant, and read the acceleration off Newton's second law.Ohm's law calculatorV, I, R, and power from any two knowns, with the formula rearranged for you.

Simulations you can drag

All interactives

Reading about a force is not the same as watching it respond. Each simulation takes a concept students find hardest and puts it under your cursor.

Projectile launcherAim, fire, and see for yourself why 45 degrees wins on range and complementary angles tie.Free-body diagram builderBuild the diagram yourself and get checked: the skill every dynamics problem grades first.Inclined plane simulatorTilt the ramp until the block slips and feel exactly where static friction gives way.

The sheets, annotated

All equation sheets

College Board hands you the equation sheet in the exam room, so nothing on it needs memorising. Knowing which line applies, and which of the four booklets prints it, is the part that is actually tested. The four sheets differ more than most students expect.

Physics 1 equation sheetEvery constant and equation as printed, grouped as the booklet groups them.Physics 2 equation sheetEvery constant and equation as printed, grouped as the booklet groups them.Physics C: Mechanics equation sheetEvery constant and equation as printed, grouped as the booklet groups them.Physics C: E&M equation sheetEvery constant and equation as printed, grouped as the booklet groups them.

Reference tables the sheets leave out

The booklet prints geometry, trigonometry, calculus and vector tables alongside the physics, and unit weightings and command terms live in the course descriptions. Those are transcribed here.

Choose how you want to review

Start with a compact course review, separate two ideas that look alike, or check the exact table and convention the exam gives you.

Course cram sheetsFour course-specific paths through the facts and formulas worth reviewing last.Concept comparisonsForce versus momentum, field versus potential, and the other pairs that get mixed up.Reference tablesConstants, task verbs, units, prefixes, identities, and calculator conventions.Physics glossaryShort answers for a symbol, definition, or named law you need right now.Visual walkthroughsWork through projectile motion and collisions one decision at a time.

Part of the Learn Network

PhysicsLearn comes from the maker of EconLearn, which the Colorado Department of Education lists in its economics resource bank. The idea is the same on every site: teach through interaction, answer first, free for everyone.

Staying with physics? Start a five-question physics sprint or scan the complete PhysicsLearn page map. Every published topic is linked there in plain HTML.