# BUTURAKU

> Feel the beauty of physics

Canonical page: [https://chrome-stats.com/d/id6759213255](https://chrome-stats.com/d/id6759213255)

## Overview

- **ID:** `id6759213255`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Fuji Bit Inc.
- **Category:** Education
- **Version:** 5.2
- **Last updated:** 2026-06-05
- **First published:** 2026-03-28
- **Size:** 24 MB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/buturaku/id6759213255)
- **Website:** [https://buturaku.fujibit.com](https://buturaku.fujibit.com/)
- **Privacy policy:** [https://buturaku.fujibit.com/privacy.html](https://buturaku.fujibit.com/privacy.html)

## Description

Explore physics at your fingertips. 12 sims: gravity, projectile, slope, energy, collisions, pendulums, springs, circular motion, brachistochrone, waves. Ask "what if?"

BUTURAKU is a physics simulation app that lets you explore physical phenomena through real-time animations.

Understand physics laws intuitively with beautiful visuals. Freely adjust parameters with sliders and observe how physical phenomena change in real time.

12 Simulations:

[Translational motion]

- Free Fall: Observe the effects of gravity and air resistance. Tap to add balls, swipe to throw them.
- Projectile: Adjust launch angle, initial speed, and air resistance to observe parabolic motion.
- Inclined Plane: Motion on a surface with friction. Experience sliding conditions by changing angle and friction coefficient.
- Brachistochrone: Race three balls down line, arc, and cycloid tracks under gravity. Bernoulli's classic 1696 problem - the cycloid wins.
- Energy Conservation: A ball rolls along a roller-coaster track while kinetic and potential energy swap places. Turn on friction to see mechanical energy dissipate into heat.
- Collision: 2D collisions based on conservation of momentum and kinetic energy. Momentum vector display available.

[Oscillation and periodic motion]

- Pendulum: Nonlinear pendulum with high-precision RK4 integration. Drag to set the angle.
- Double Pendulum: Coupled pendulums producing chaotic motion. Lagrangian mechanics + RK4.
- Coupled Pendulum: Two pendulums joined by a spring exchange energy periodically — the classic beat phenomenon.
- Spring: Simple harmonic motion with Hooke's law. Adjust spring constant, damping, and mass.
- Circular Motion: Uniform circular motion with centripetal force visualization (F = mω²r). Adjust radius, angular velocity, and mass.

[Waves]

- Wave: Tap to place wave sources and observe interference patterns. 2D wave equation solved numerically with finite differences.

[Features]

- Real-time physics simulation
- Intuitive touch controls
- Freely adjustable parameters via sliders
- Physics explanations for each simulation
- Dark / Light theme support
- Japanese and English language support

## Rankings

- #1,448,988 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6759213255)