AP Physics 1 has one of the lowest pass rates of any AP exam, and the reason is not the content. The content is a first course in mechanics. The reason is that the exam asks you to explain, in writing, why something happens — and most students arrive having practised only how to compute what happens.

This course is built around that gap. Every unit ends with a written argument, not just a numerical answer, and the worked solutions show you the reasoning a grader is looking for alongside the algebra.

The order, and why it is this order

Units run in sequence and unlock in sequence. That is deliberate: energy makes very little sense before forces, and momentum is confusing until energy has landed. You can skip ahead in a flexible course and quietly build a hole. Here you cannot.

1. Kinematics — motion described precisely, and graphs read as sentences

2. Forces — free-body diagrams, Newton's laws, friction and connected systems

3. Energy — work, the work-energy theorem, conservation and bar charts

4. Momentum — impulse, conservation and collisions

5. Rotation — torque, rotational inertia and angular momentum

6. Oscillation — springs, pendulums and simple harmonic motion

7. Exam craft — experimental design, paragraph arguments and timing

What is actually in it

• Fifty-two recorded lessons, most between twelve and twenty minutes

• A problem set per lesson, with a filmed solution for every question — not an answer key

• Eight unit tests written to AP format and AP difficulty

• Three full practice exams with both sections timed as on the day

• Every released free-response question from the last eight cycles, sorted by topic

• A rebuild sheet: every AP 1 equation derived from something more basic, so a blank moment is recoverable

The written-answer problem

About a third of your grade comes from explaining. AP graders reward a specific shape of argument: claim, physics principle, evidence, conclusion. It is learnable and almost nobody teaches it explicitly.

So every unit here ends with two or three paragraph-argument prompts, and the model answers are annotated to show which sentence earned which point. Students routinely tell us this section alone moved them a full grade.

I could do all the math and I was getting 3s on practice tests. Turned out I was writing two sentences where the rubric wanted four, and I had never seen a rubric. Fixed that in about three weeks. Got a 5.

Daniel O., grade 11, Texas

The first unit is open as a free preview, problem set and solutions included. Watch the kinematics graphs lesson before you buy — if reading a velocity-time graph stops feeling like decoding, the rest of the course works the same way.