# equivalence principle

> equivalence principle (iPhone/iPad app by Sungjun Kim.)

- Source: https://appshunter.io/ios/app/equivalence-principle/id6670335382 (this page in markdown: same URL + `.md`)
- Developer: [Sungjun Kim](https://appshunter.io/developer/1602461985)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 0 MB
- Languages: English
- Released: 2024-09-16
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/equivalence-principle/id6670335382/reviews.md

## What is equivalence principle?

This app represents the equivalence principle which states that gravitational and inertial forces are of a similar nature and often indistinguishable. Left rocket is moving up with constant acceleration a, and right rocket is on the some planet where the gravitational acceleration is g. If a is equal to g, the motion of a ball which is dropped in the left rocket is the same as the motion of a ball which is dropped in the right rocket; two balls experience the same constant acceleration motion. This is the simple demonstration of the equivalence principle. This app doesn't simulate the whole motion of a ball. Only falling motion is intended to show the equivalence principle.


## Version history (last 1 release)

### 1.0 — 2024-09-16

No release notes.

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## More apps by Sungjun Kim

- [relativistic balloon](https://appshunter.io/ios/app/relativistic-balloon/id1633566916)
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- [relativistic space travel](https://appshunter.io/ios/app/relativistic-space-travel/id6443974500)
- [Learning Hangul](https://appshunter.io/ios/app/learning-hangul/id6449379992)

All apps by Sungjun Kim: https://appshunter.io/developer/1602461985

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*