Improved Physics
by dark-ember
Improved Physics changes how living entities move, adding slime blocks that bounce and a speed cap on mid-air movement for Fabric on 1.20.1.
What it does
The mod aims to make entity movement physics somewhat more realistic. In vanilla Minecraft, living entities such as players lose 15% of their velocity each second, and the mod's author describes that default as far from realistic. Improved Physics instead removes 9% of living entity velocity per tick, a change the author notes is still in an indev state.
Two blocks are added for testing the new physics. The slime layer is a bouncy surface that can be placed on a floor, and the improved physics slime block bounces with zero friction. Bouncing is still slightly buggy and depends on block placement. The mod requires Fabric API, and the slime layer does not work when its down face is enabled.
Installation is for Fabric only, with the 1.0.1 build targeting 1.20.1 as the only game version. The server and every player need the mod installed. The code is closed: the mod is released under All rights reserved and is not open source, although public links to its source and issue tracker exist.
Key features
Reduced living entity drag
Living entities lose 9% of their velocity per tick instead of vanilla's 15% per second, making movement feel less damped.
Slime layer block
A bouncy layer that can be placed on a floor to make entities rebound from it.
Zero-friction slime block
An improved physics slime block bounces with no friction, which the author describes as still being tested.
Planned speed cap
The author is considering a speed cap that prevents players from gaining insane speeds through backwards hopping and mid-air friction.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Hold That Slime is a server-side only mod under the MIT License for 1.20.1 with no open source status, so players do not install it, while Improved Physics needs both the server and clients. Bouncing Projectiles (PBOSB for Fabric) is client and server, under the MIT License, and covers 1.21 – 1.21.1, a range that does not include 1.20.1. Improved Beacons is a server required mod under a Creative Commons license for 1.21.1 – 1.21.11, which also does not reach 1.20.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Improved Physics | Fabric | 1.20.1 | Client and server | 2025-09-08 |
| Hold That Slime | Fabric | 1.20.1 | Server-side only | 2024-03-07 |
| Bouncing Projectiles(PBOSB for Fabric) | Fabric | 1.21 – 1.21.1 | Client and server | 2026-03-29 |
| Improved Beacons | Fabric | 1.21.1 – 1.21.11 | Server required, client optional | 2026-02-15 |
Questions
Does Improved Physics need Fabric API?
Does the server need Improved Physics?
Which game versions does Improved Physics support?
In the catalog
Improved Physics is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 34,764 mods support Minecraft 1.20.1.
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What the author says
In vanilla minecraft, living entities such as the player lose all but 15% of their velocity every second. This is vastly unrealistic, and hence this mod. It is still indev and is not a realistic physics engine, but this mod fixes things such as the removal of 9% of living entity velocity every tick. Blocks(still…
Official listing
- Modrinth page
- modrinth.com/mod/improved-physics
- Owner
- dark-ember
- Published
- 2025-08-25
- Updated on Modrinth
- 2025-09-08
- Facts verified
- 2026-10-15