StemGraphFrequently Asked Questions
What level of physics does StemGraph cover?
Calculus-based physics. The current course covers mechanics, from kinematics through collisions and momentum. More topics are being added. You should be comfortable with derivatives and basic integrals before starting.
How is this different from Khan Academy?
Khan Academy covers physics at an algebra-based level without structured sequencing. StemGraph is calculus-based, follows a dependency graph that adapts to your knowledge gaps, and uses spaced repetition to make sure you retain what you learn.
Why multiple choice?
Each wrong answer is the result of a specific common mistake, like using the wrong trig function or dropping a sign. Picking one tells you exactly what you misunderstood. All correct answers are computationally verified, so they're always right.
How long does a lesson take?
Roughly 20 to 45 minutes. Each lesson covers one concept across three sections, with an explanation, a worked example, and practice problems in each.
How does spaced review work?
After you complete a lesson, the system schedules reviews at increasing intervals. Each review tests the same skill with fresh numbers. You can't memorize your way through. If a review reveals a gap, the concept comes back sooner.
Can I skip ahead?
A diagnostic test at the start places you based on what you already know. From there, you follow the prerequisite chain. The system won't make you redo material you've already mastered.
Is this just for AP students?
No. StemGraph is for anyone learning rigorous, calculus-based physics. High school students, university students, and self-taught learners all use the same course. The diagnostic test finds your starting point.
Is there a free trial?
Yes. 7 days free, then $29 per month. Cancel anytime.