Start Physics
School physics from the gap up
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
1,364 new problems across five courses of Korea's 2022 curriculum, now with Mechanics and Energy and Electromagnetism and Quantum Physics. Constants come in the problem.
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 (270 problems)
· Integrated Science: Physics (Grade 10) —— foundations of science, mechanical
systems, electrical properties of matter, power generation (206 problems)
· Physics (Grade 11) —— equilibrium, momentum and energy, heat, electric fields and
circuits, induction, light and lenses, quanta and matter (378 problems)
· Mechanics and Energy (Career Elective) —— motion in a plane, gravity and space,
heat and thermodynamics, oscillations and sound (270 problems)
· Electromagnetism and Quantum Physics (Career Elective) —— electric fields,
induction, semiconductors, light and communication, the quantum world (240 problems)
126 lessons, 1,364 problems (4 challenge problems in every 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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The two Career Elective courses now have challenge problems.
· 40 new challenge problems, 4 in each of the 10 chapters of Mechanics and Energy and Electromagnetism and Quantum Physics, each tying two or three concepts together —— find them in the "Extra" section of each chapter's last lesson; they open when you buy the course
· All 26 chapters across the five courses now have challenge problems, 104 in all
· The app now has 1,364 problems, up from 1,324
· When the gap behind your mistakes is in math, the card in Mistakes now opens that unit in Start Math, our math app, which is now in English too
The developer, CHUNGKIL KIM, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- CHUNGKIL KIM
- Size
- 28.7 MB
- Category
- Education
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Electromagnetism & Quantum $5.99
- Mechanics and Energy $5.99
- Physics $6.99
- Integrated Science: Physics $4.99
- Middle School Physics $3.99
- Copyright
- © CHUNGKIL KIM
