BUTURAKU
Feel the beauty of physics
Free · Designed for iPad. Not verified for macOS.
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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Added an About dialog showing the version and copyright.
- Added a copyright line at the bottom of the home screen.
- Tightened home-screen card padding for stable layout on narrow displays.
The developer, Fuji Bit Inc., 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Fuji Bit Inc.
- Size
- 24.9 MB
- Category
- Education
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Fuji Bit