Physics Simulator: HS & AP

Physics Sandbox is a physics lab for high school and AP Physics students who want calibrated intuition, not just formulas — commit to a number before the experiment runs, then watch a real physics simulator prove you right or wrong.

Every lesson runs on an actual rigid-body physics engine, not a canned animation. You predict what will happen — how far the ball lands, how fast the block slides down the ramp, how long the pendulum swings — then hit Run and watch real gravity, friction, and collisions play out frame by frame in 3D. Verify shows your guess next to what the engine actually measured, with an honest "Off by X%" when you're wrong, so the feedback means something. This is a physics simulator built for practice, not a video lecture wrapper.

CURRICULUM — 4 units, 33 lessons

• Kinematics (8 lessons): free fall, projectile motion, horizontal launch, and reading velocity-time graphs

• Newton's laws & friction (9 lessons): force and motion on ramps, inertia, F = m·a, and rolling friction

• Energy & momentum (9 lessons): elastic and inelastic collisions, restitution, and conservation of momentum

• Simple harmonic motion & springs (7 lessons): spring oscillation, Hooke's law, and pendulum period

PLAYGROUND — build your own rig

• 5 adjustable rigs — ramp, projectile motion, springs and pendulums, and collisions — each with real sliders you drag and re-run

• Every rig runs the same engine as the lessons, so changing a slider is a genuine physics experiment, not a preset clip

• Orbit the camera around the live 3D scene while it runs

DAILY PREDICTION — a new challenge every day

• One motor-graded prediction each day, sampled from the sandbox rigs and graded by the same simulator that runs the lessons

• A running accuracy record, split by unit, plus a streak for correct predictions

• Optional daily reminder — off by default, turn it on in Settings if you want it

MORE

• Ask "Why?" for a short AI explanation of the physics behind any result you just watched

• 10 languages, with light and dark themes

• Track lessons completed, prediction accuracy, and your streak, unit by unit

WHAT'S FREE

All 8 Kinematics lessons, the first two Newton & Friction lessons, plus one sampler lesson each from Energy & Momentum and SHM & Springs — 12 lessons in total, reaching into all four units. The entire Playground, all 5 rigs included. The Daily Prediction, free forever, offline, with its own accuracy record and streak. 3 AI "Why?" explanations a day.

WHAT PRO ADDS

The remaining 21 lessons across Newton & Friction, Energy & Momentum, and SHM & Springs. Unlimited AI "Why?" explanations instead of 3 a day. No ads.

Physics Sandbox Pro is offered as a Monthly or an Annual auto-renewing subscription. Payment is charged to your Apple ID account at confirmation of purchase. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period, and your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage your subscription or turn off auto-renewal anytime in your device's Account Settings after purchase. See our Terms of Use and Privacy Policy below.

Whether you're studying for AP Physics 1, working through a first high school physics course, or relearning mechanics as an adult, Physics Sandbox turns "I can do the algebra" into "I know what the number will be" — one graded prediction at a time.

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