Start Physics
School physics from the gap up
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
790 new problems across three courses of Korea's 2022 curriculum, in English. Constants come in the problem, and the grader knows that 0.04 kN is 40 N.
Study school physics in one flow: concepts, worked examples, practice, review.
No account. No internet connection needed.
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. When it is, the card says so plainly, so you know to
go back to your math course rather than read the physics again.
■ 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 —— 92 figures drawn from coordinates.
With VoiceOver, formulas are read aloud the way a teacher says them: "1 over 2",
"v squared", "the square root of 2 g h" —— and units by name, "meters per second
squared", not "m divided by s 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 and their effects, heat, light and
waves, electricity and magnetism, motion and energy (250 problems)
· Integrated Science: Physics (Grade 10) —— foundations of science, mechanical
systems, electrical properties of matter, energy conversion and power
generation (190 problems)
· Physics (Grade 11) —— force and equilibrium, momentum and mechanical energy, heat
and energy conversion, electric fields and circuits, magnetic fields and
electromagnetic induction, the wave nature of light and lenses, quanta and
matter (350 problems)
79 lessons, 790 problems, 99 concepts and a 133-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 —— 320 problems,
40% of the app.
■ 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.
More diagrams in the lessons.
· 48 lessons whose concept cards had no diagram now have one —— light and waves, heat, semiconductors, modern physics, measurement, electricity and more; the app now draws 92 figures, up from 36
· On coordinate graphs, the name of the vertical axis no longer covers the axis or the top tick number
· Labels no longer overlap arrows or lines in the torque problem, the incline and the mechanical-energy graph
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
- 21 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
- Physics $6.99
- Integrated Science: Physics $4.99
- Middle School Physics $3.99
- Copyright
- © CHUNGKIL KIM
