Physics solver app · Available now on Android
From given quantities to the final unit check.
Scan or type physics word problems and numericals on Android. Stemulus identifies the known variables, selects the governing equation, works through the algebra step by step, checks the numerical result, and turns your problem set into a physics study guide.
iPhone, iPad, and Mac: coming soon to the App Store.
10 free scan credits to start. No sign-in needed.
Physics · Kinematics
A car accelerates uniformly from v0 = 12 m/s to v = 28 m/s over t = 4.0 s. Find the acceleration a and distance Δx.
Step by step.
- Find acceleration from velocity change over time a = (28 − 12) / 4.0 = 4.0 m/s2 Use the constant-acceleration definition a = (v − v0) / t.
- Compute displacement during the 4.0 s interval Δx = 12(4.0) + ½(4.0)(4.0)2 = 48 + 32 = 80 m Substitute v0, a, and t into Δx = v0t + ½at2.
- Check with the time-independent kinematics equation v2 = 122 + 2(4.0)(80) = 144 + 640 = 784 = 282 Verifying with v2 = v02 + 2aΔx confirms Δx = 80 m.
Solution
a = 4.0 m/s2, Δx = 80 m
Arithmetic checks passed
Built for physics homework
Understand which formula to use and why.
The hardest part of physics isn't punching numbers into a calculator; it's translating a word problem into the right physical law and keeping signs and units straight.
Clear variable extraction and formula choice
Every solution breaks the problem into numbered steps, showing which physical principle or equation applies first before substituting numerical values.
Independent numerical verification
Supported physics calculations are checked by substituting results back into the governing equations, catching sign errors, squared-term mistakes, and arithmetic slips.
Save your own attempt before checking
On homework portals with limited submission attempts, enter your calculated value in Stemulus first to compare your work step by step before submitting.
One-tap LaTeX export for lab reports
Copy symbolic derivations and worked equations directly as LaTeX for physics lab reports, Markdown notes, or study sheets.
Physics topics covered
High school, AP Physics, and introductory college physics.
Scan printed problem sets, textbook exercises, or handwritten equations across core physics units.
Mechanics
Kinematics, Newton's Laws & Projectile Motion
1D and 2D motion, free-body force balances, friction on inclined planes, circular motion, and universal gravitation.
Energy & Momentum
Work, Conservation Laws & Rotational Dynamics
Work-energy theorem, potential and kinetic energy, elastic and inelastic collisions, impulse, torque, and rotational inertia.
Electricity, Waves & Thermo
Circuits, Electrostatics, Optics & Gas Laws
Coulomb's law, electric fields, Ohm's law, series and parallel resistor/capacitor circuits, wave frequency, thermodynamics, and ideal gas problems.
Master the problem types
Practice physics numericals before the midterm.
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01 · Assignments
Save your weekly physics problem set
Keep all problems from a chapter or WebAssign/Mastering Physics homework set together, and flag the ones that tripped you up as Still stuck.
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02 · Study guide
Generate a formula & method sheet from your work
Stemulus compiles the concepts, equations, and when-to-use-them rules from your saved problems, complete with worked examples linked back to your homework.
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03 · Practice
Solve three new physics problems with progressive hints
Generate a practice round targeting the topics you marked Still stuck. Reveal hints one step at a time so you practice setting up the equation yourself.
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04 · Offline
Review formulas and practice sets anywhere
Saved solutions, study guides, and practice rounds open for free and work offline, with no subscription required to review your own work.
How to use Stemulus alongside online physics homework platforms
If your course uses online homework portals where you only get three tries per problem and each student gets randomized numbers, copying an answer from a forum won’t work. Instead:
- Work the problem on paper first and enter your tentative answer into Stemulus before tapping Check Problem.
- Compare the symbolic setup in Step 01 and Step 02 to verify whether you missed a cos θ component, a negative sign on g, or a unit conversion from cm to m.
- Mark the problem Still stuck or Review later and start a Practice Round (learn more about the STEM Study Guide Generator) to solve three fresh questions with progressive hints before your exam. Also taking Chemistry or Calculus? Explore our Chemistry Solver App and Word Problem & Calculus Solver.
Pricing
Start free, then pay the way you study.
No sign-in is needed to check problems or subscribe. Every new account starts with 10 free scan credits. Link an Apple or Google account when you want to use your access on other platforms.
Subscription
Stemulus Pro
$4.99 per week
- 100 problem checks or study generations per rolling seven days
- Each check becomes available again seven days after you use it
- A failed generation returns its allowance
- Renews weekly until canceled
One-time purchase
50 Scan Credits
$2.99 once
- One credit checks one problem
- No subscription, buy another pack when you need it
- Opening saved solutions, guides and practice never uses a credit
US prices shown; your local price appears in the App Store or Google Play before you buy. A problem check uses one scan credit. For people without a subscription, generating a study guide or practice set also uses one scan credit, disclosed before you confirm, and a failed generation returns it. The subscription renews automatically until canceled; manage or cancel it in your App Store account or in Google Play. No free trial is offered.
Questions & Answers
Frequently asked questions
Can Stemulus solve physics word problems from a camera photo?
Yes. Use the Android camera scanner to photograph printed or handwritten physics word problems, preview the crop before spending a credit, and get a step-by-step breakdown.
How does Stemulus avoid LLM math mistakes on physics problems?
First, Stemulus states on every solution that AI-generated work can contain mistakes. Second, for supported numerical and algebraic calculations, Stemulus runs an arithmetic verification check by substituting the final values back into the governing equations, and tells you to review the result when a check cannot confirm it.
Do I need a subscription to use the physics solver app?
No. You get 10 free scan credits immediately with no sign-in. After that, you can purchase a one-time pack of 50 Scan Credits for $2.99 or subscribe to Stemulus Pro for $4.99/week (100 checks or study generations per rolling 7 days).
Available now on Android. Coming to iPhone, iPad, and Mac.
Stemulus requires Android 8.0 or later, or iOS 26.5, iPadOS 26.5, or macOS 26.5 or later, and is available in English.
iPhone, iPad, and Mac: coming soon to the App Store.