AP Physics · 1, 2 & C
AP Physics 1, 2 & C AI Homework & Doubt Solver
Photograph any AP Physics problem — free-body diagram, circuit, ray diagram or graph — and get a narrated whiteboard video that works through it on your own figure, with written steps and PDF notes.
AP Physics rewards reasoning more than plugging numbers into formulas. Free-response questions ask you to justify a claim, sketch a graph or explain why a quantity increases — and the textbook answer key usually just shows a final number. Doubtclip fills that gap: it explains why each step follows, so you can reproduce the reasoning on test day.
It works for algebra-based AP Physics 1 and 2 as well as calculus-based AP Physics C: Mechanics and AP Physics C: Electricity & Magnetism.
Who it is for
AP Physics 1 & 2 students
Algebra-based mechanics, waves, fluids, thermodynamics and circuits — explained with clear diagrams instead of dense algebra.
AP Physics C students
Calculus-based problems where you need to set up an integral for a charge distribution or solve a drag-force differential equation.
Self-studiers & night-before reviewers
If your school does not offer the course or your teacher is unavailable, scan the practice question and see the full method.
Parents and tutors
Use the video as a second explanation when a student says “I still don’t get it” after the first one.
How it works
Step 1
Snap, upload or paste
Photograph the question from your textbook or worksheet, drop in a screenshot from your homework portal, or paste the text. Diagrams, graphs and circuit drawings come along with the image.
Step 2
AI solves it on your diagram
Doubtclip reads the question, works out the method and draws the solution on a whiteboard — marking forces, angles, axes or labels on the figure that came with your question instead of a generic one.
Step 3
Watch the video, keep the steps
You get a narrated whiteboard video, a written step-by-step solution you can check line by line, and PDF notes to revise from later.
AP Physics units covered
Kinematics
Motion graphs, SUVAT-style equations, projectiles and relative velocity.
Dynamics
Newton’s laws, free-body diagrams, friction, inclines and Atwood machines.
Circular motion & gravitation
Centripetal force, banked curves, orbits and Newton’s law of gravitation.
Energy
Work–energy theorem, conservation of energy, springs and power.
Momentum
Impulse, elastic and inelastic collisions, centre of mass.
Rotation
Torque, moment of inertia, rolling motion and angular momentum.
Simple harmonic motion
Springs, pendulums, period, and energy in oscillations.
Fluids
Pressure, buoyancy, continuity and Bernoulli’s equation (AP Physics 2).
Thermodynamics
Ideal gases, PV diagrams, the first law and heat engines.
Electrostatics
Coulomb’s law, electric fields and potential, Gauss’s law in AP Physics C.
Circuits
Series and parallel resistors, Kirchhoff’s rules, capacitors and RC circuits.
Magnetism & induction
Magnetic force, Biot–Savart, Faraday’s and Lenz’s laws (AP Physics C: E&M).
Optics
Reflection, refraction, lenses, mirrors and interference.
Modern physics
Photoelectric effect, energy levels, nuclear decay and mass–energy.
Sample question walkthrough
AP Physics 1 style · Dynamics
A 2.0 kg block rests on a frictionless ramp inclined at 30°. A light string runs from the block over a frictionless pulley at the top of the ramp to a hanging 3.0 kg mass. Find the acceleration of the system and the tension in the string. (Use g = 9.8 m/s².)
- Draw a free-body diagram for each mass. The block has gravity, the normal force and tension; only mg sin 30° acts along the ramp. The hanging mass has gravity and tension.
- Choose the direction of motion as positive: the 3.0 kg mass falls, so the block moves up the ramp.
- Hanging mass: m₂g − T = m₂a. Block: T − m₁g sin 30° = m₁a.
- Add the two equations to eliminate T: m₂g − m₁g sin 30° = (m₁ + m₂)a, so a = (3.0 − 2.0 × 0.5)(9.8) / 5.0 = 3.92 m/s².
- Substitute back: T = m₂(g − a) = 3.0 × (9.8 − 3.92) ≈ 17.6 N.
Answer: a ≈ 3.9 m/s² (block up the ramp), T ≈ 17.6 N.
In the video, both free-body diagrams are drawn on the ramp from your picture, and the sign convention is explained before any algebra — exactly what AP free-response graders look for.
Related free physics tools
FAQ
Does Doubtclip handle AP Physics C calculus problems?
Yes. It sets up derivatives and integrals where the physics needs them — for example finding the field of a charged rod, the work done by a variable force or velocity under linear drag — and explains each calculus step in words.
Can it explain free-response “justify” and “explain” questions, not just numericals?
Yes. For qualitative parts it states the governing principle, links it to the situation and writes a short paragraph-style justification, which is a useful model for how to word your own answers.
Will it use the diagram from my worksheet?
If you upload a photo or screenshot that includes the figure, the whiteboard video marks forces, angles and labels on that figure so the explanation matches what you see on your page.
Can it solve multiple-choice questions?
Yes. It works out the correct option and explains why the distractors are wrong — helpful because AP multiple-choice options are often built from common mistakes.
Is it free?
New accounts can try Doubtclip with a small number of free doubt videos. After that, paid plans give you more videos each month — see the pricing page for current plans. The free calculators linked on this page cost nothing to use.
Should I use it instead of doing the homework myself?
Try the problem first, then use the video to find where your reasoning went wrong. Students learn most when they compare their own attempt with a worked method rather than copying an answer.
Keep exploring
Clear your next AP Physics doubt
Upload a photo of the problem — get a whiteboard video drawn on your own diagram, plus written steps.