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A physics practice room built around the mistakes that cost points.

Choose AP Physics 1, AP Physics 2, Physics C, F=ma, USAPhO intro, or the full bridge. Each track gives you focused explanations, a local progress ledger, targeted problem sheets, ladder links, and mock tests with worked solutions.

Course lanes: Physics 1 · Physics 2 · Physics C · F=ma · USAPhO
Lessons: 19 trap repairs
Worked drills: 92 problems
Mock tests: 37 questions · 113 pts

Choose a lesson below or work directly from the complete problem ledger.

Open all 92 problems →

01
Pick your course lane.
Physics 1 gets mechanics foundations. Physics 2 gets thermo, E&M, waves, optics, and modern model choice. Physics C, F=ma, and USAPhO get the heavier constraints and rotation.
02
Learn one trap deeply.
Every lesson explains why the wrong move feels reasonable, then replaces it with a model you can reuse under pressure.
03
Practice, then mock-test.
Warm-up drills build the habit. Bridge and exam-speed drills test transfer. Mock checks tell you whether it stuck.

Choose your lane

Study by exam format, repair by reasoning pattern.

AP tracks keep the conceptual model clean. F=ma adds timed mechanics traps. USAPhO intro switches to longer, justified solution writing instead of pretending every hard problem is the same thing.

All tracks

See the whole AP to F=ma to USAPhO bridge in one sequence.

Use this when you are planning the full platform route or browsing for weak spots.

local progress 0%

0problems reviewed

0mocks checked

19lessons in lane

recommended sequenceAP Physics 1 / AP C entry

AP mechanics foundation

Clean up the force, axis, friction, and circular-motion mistakes that make contest problems feel random.

Best for: You know the formulas but still lose points because the diagram, sign, or force direction is off.

Diagnostic signal: Misses on normal force, static friction, projectile components, or constant-speed circular motion.

You should be able to

Draws free-body diagrams without non-interaction forces.Chooses axes before resolving components.Treats static friction as a response, not a fixed formula.Marks inward acceleration on any curved path.

Lesson ledger

Normal force is not always mgAP Static friction is not always maximumAP Constant speed does not mean zero accelerationAP/F=ma Impulse is a vector, so signs matterAP

Ladder links

R1: Identify the forces on a blockAP R2: Choose axes on an inclineAP R3: Find the normal force on an inclineAP R4: Static friction thresholdAP R7: Circular motion: force directionF=ma R11: Apparent weight in an elevatorAP R13: Friction from relative motionF=ma R15: Projectile componentsAP

practice Problem desk

Pick one problem. Attempt it. Then open the hint and solution.

Warm-up AP concept

What it testsMake the same model choice used in the linked lesson, then carry it into a fresh setup.

First moveUse the component perpendicular to the wrench.

Hint

Use the component perpendicular to the wrench.

Worked solution

τ = rF sin 30° = (0.25)(20)(0.5) = 2.5 N·m.

Common trap: Using τ = rF without the angle factor.

R32 lesson

learn Lessons

Short repairs for the exact model mistake.

Find my misses

Forces Normal force is not always mg AP · 5 minForces Static friction is not always maximum AP · 5 minCircular motion Constant speed does not mean zero acceleration AP/F=ma · 6 minMomentum Momentum is conserved only after an external-impulse check AP/F=ma · 6 minSystems Energy vs momentum: how to choose F=ma · 7 minConstraints Why constraint equations matter AP C/F=ma · 7 minModeling F=ma problems hide systems F=ma · 6 minRotation Rolling without slipping is a constraint AP C/F=ma · 7 minRotation Tension is uniform only in the ideal string limit F=ma/USAPhO · 6 minMomentum Impulse is a vector, so signs matter AP · 5 minRotation Torque uses the perpendicular lever arm AP · 5 minCircuits Current is not used up AP · 5 minThermodynamics Heat, temperature, and internal energy are different AP Physics 2 · 6 minFluids Pressure, buoyancy, and flow are different fluid models AP Physics 2 · 7 minElectricity Electric field is not electric potential AP Physics 2 · 6 minCircuits Capacitors change role over time AP Physics 2 · 6 minMagnetism Magnetic force is perpendicular to velocity and field AP Physics 2 · 6 minMagnetism Induced current opposes flux change, not flux AP Physics 2 · 6 minWaves and modern Waves, optics, and photons depend on the model you choose AP Physics 2 · 7 min

test Mock checks

Use these when your written setup is stable.

Completion stays in this browser.

AP → F=ma readiness

Mechanics foundation check

A compact check for the force-direction, normal-force, friction, and circular-motion habits that decide early contest mechanics.

25 min · 6 questions · 15 pts Open mock

F=ma bridge

Forces and constraints mock

A bridge set for pulleys, system boundaries, friction direction, and accelerating frames.

35 min · 6 questions · 19 pts Open mock

AP → F=ma

Energy and momentum mock

A decision-making set for choosing the right conservation law on the right interval.

35 min · 6 questions · 20 pts Open mock

AP C → USAPhO intro

Rotation and rolling mock

A concentrated test of torque arms, rolling constraints, angular momentum, and rotational energy.

40 min · 6 questions · 22 pts Open mock

AP Physics 2

Physics 2 mixed model check

A cross-unit check for the AP Physics 2 habit that matters most: choosing the right model before calculating.

45 min · 9 questions · 27 pts Open mock

AP Physics 1/2

Circuits repair mini-check

A short conceptual check for current, voltage, and series/parallel reasoning.

15 min · 4 questions · 10 pts Open mock

next Find your actual pattern

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