Physics Zen vs Start Physics

Physics Zen turns physics into focused, repeatable practice. Work through fresh generated problems, check your answer instantly, and open the theory or worked solution exactly when you need it. A COMPLETE PHYSICS PATH Practice 66 skills across 21 topics: • Mechanics: motion, projectiles, forces and friction, accelerating and rotating frames, energy, momentum, centre of mass, rotation, circular motion, gravitation, oscillations and fluids • Electricity and Magnetism: electric fields, circuits and the Wheatstone bridge, capacitors, RC transients, magnetic fields and the Hall effect, induction, inductance and AC • Waves and Optics: wave graphs, sound, interference, reflection, refraction, lenses and diffraction • Thermodynamics: heat, gas laws, kinetic theory, entropy, engines and renewable energy • Modern Physics: photons, Compton scattering, black-body radiation, matter waves, X-rays, nuclear physics, particle physics and special relativity EXAM PREP Fifteen exam paths, each built from the topics its exam actually tests: • AP Physics 1, AP Physics 2 and AP Physics C: Mechanics, with free-response items that give follow-through marks • AP Physics C: Electricity and Magnetism, with calculus practice on Gauss's and Ampère's laws and RC, LR and LC circuits • NY Regents Physics, built on the Reference Tables • A-Level Physics, with required-practical data analysis: tables, gradients and uncertainties • HKDSE Physics (Hong Kong) • Abitur Physik, with fine-beam tube and Wien filter labs • FSP Physik (Studienkolleg), for the Feststellungsprüfung at a German Studienkolleg • French Bac physics, including Newton's law of cooling and the telescope; chemistry and the practical assessment are not included • Japan's University Entrance Common Test in Physics and Basic Physics, with digit-cell answers • Korea's CSAT (Suneung) Physics I, and the physics part of CSAT Integrated Science from 2028 • Taiwan's Advanced Subjects Test (分科測驗) Physics, which also covers the physics in the GSAT (學測) science paper • Board-specific gravity conventions Every item is original practice, not an official exam paper. BUILT FOR PRACTICE Generated Problems: Practise fresh parameter combinations across multiple difficulty levels. Mastery Progression: A five-level bucket system moves from foundations to multi-step problems as you demonstrate understanding. Theory Beside the Problem: Open concise explanations, formulas and worked examples without leaving your session. Mistake Journal: Wrong answers are saved automatically. Retry the same concept later with fresh numbers. Visual Physics: Graphs, force diagrams, circuits, waves, rays, energy levels and fluid scenes support the problems that need them. Offline First: The curriculum and generator work without an internet connection. Optional sign-in adds cross-device sync. Focused Interface: No ads, no coins and no lives. Includes light and dark themes. Content is available in thirteen languages: English, German, French, Spanish, Brazilian Portuguese, Dutch, Swedish, Norwegian, Japanese, Simplified Chinese, Traditional Chinese, Korean and Russian. HOW IT WORKS 1. Choose a section, topic or exam path. 2. Solve a generated problem at your current level. 3. Check your answer and read the worked solution. 4. Build mastery and return to mistakes that need another pass. Most skills are free, and Kinematics is free end to end. Premium unlocks the last skill of each topic, the exam-prep paths and detailed statistics. Subscription and lifetime options are shown in the app with local pricing before purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your App Store account settings. Privacy Policy: https://physics-zen.com/privacy Terms of Service: https://physics-zen.com/terms Support: contacts@trifoiltrailblazer.com

Study school physics in one flow: concepts, worked examples, practice, review. The app follows your device language —— English or Korean. Switch at any time; your records carry over. ■ It traces the gap If you keep missing conservation of mechanical energy and the real gap is in work and kinetic energy, solving the same problem a hundred more times will not help. This app gathers the concepts behind your wrong answers, walks back along the prerequisites to the weakest one, and tells you where to start again. A unit you reach this way opens its concepts and examples even when it is locked, and it stays open. Sometimes the gap is in math; the card then opens that unit in our Start Math app. ■ Constants are given inside the problem Some textbooks take gravitational acceleration as 9.8 m/s², others as 10. If the answer depends on which book you own, that is guessing, not study. Every problem states the constants it needs: "Take g = 10 m/s²." ■ A grader that knows units If the answer is 40 N, 0.04 kN is right too. Unit prefixes, conversions such as km/h to m/s, and tolerance for decimal answers are all handled, and every grading rule is covered by automated tests so that a right answer is never marked wrong. Questions never say "answer in newtons". The answer box shows the unit. Written answers accept the forms people actually write —— "valence band" or "the valence band", "3" or "3 times". ■ Wrong answers come back when you are about to forget Missed problems go into a review notebook and return after 1, 3, 7, 16 and 35 days. Get one right and the interval grows; miss it again and it starts over. You can mark why you missed it —— a slip in the math, an idea you misunderstood, or a question you misread. A slip does not lower your mastery of the concept, and it comes back in three days instead of one. ■ Formulas and diagrams are typeset, not pasted No formula is an image. Fractions, radicals and vector arrows are drawn by typesetting rules, so nothing blurs when you make the text larger. Free-body diagrams, circuits, magnetic fields, energy levels and ray diagrams for lenses —— 142 figures drawn from coordinates. With VoiceOver, formulas and units are read aloud the way a teacher says them —— "1 over 2", "meters per second squared". ■ Concepts you can move Six simulations —— resultant force, gravity and weight, elastic force, friction, buoyancy, and how a net force changes motion. Drag the values and watch what happens; it is quicker than reading about it. ■ What is inside · Middle School Physics (Grades 7–9) —— forces, heat, light and waves, electricity and magnetism, motion and energy (345 problems) · Integrated Science: Physics (Grade 10) —— foundations of science, mechanical systems, electrical properties of matter, power generation (263 problems) · Physics (Grade 11) —— equilibrium, momentum and energy, heat, electric fields and circuits, induction, light and lenses, quanta and matter (483 problems) · Mechanics and Energy (Career Elective) —— motion in a plane, gravity and space, heat and thermodynamics, oscillations and sound (345 problems) · Electromagnetism and Quantum Physics (Career Elective) —— electric fields, induction, semiconductors, light and communication, the quantum world (306 problems) 126 lessons, 1,742 problems (3 extras per lesson, 4 challenges per chapter), 146 concepts and a 211-entry glossary, all in English. Every problem was written for this app. The courses follow South Korea's 2022 national curriculum, including the limits its commentary sets —— where it says a topic is to be treated qualitatively, we do not ask for numbers. ■ Buying One purchase per course. Not a subscription, never expires, Family Sharing on. Without buying, the first two lessons of every chapter stay open —— 520 problems. ■ Requirements iOS 18.0 or later. No account. Works offline. Your study records stay on your device and in your own iCloud.