MAJORFailure Reference

Kling Physics Collapse — Refund Guide

Technical Classification

Physics Prior Degeneration

Physics Prior Degeneration on Kling is a known weakness of Kuaishou's diffusion model — physics is encoded statistically through training video, not via a simulation prior. Under fast motion, multiple interacting objects, or fluid scenes, the model produces output that is visually plausible frame-by-frame but physically impossible across frames. Common in sports, cooking, and action prompts.

How to identify this failure

✕Falling object hovers or accelerates upward
✕Water splash dissipates before contact with surface
✕Character passes through wall, floor, or door
✕Thrown object changes mass mid-flight
✕Liquid pours upward or stops mid-air

Real generation examples

Prompt used

"A basketball player dunking, slow motion"

Failure observed @ 0:02

Ball passes through the rim from above without contact

Prompt used

"Hot coffee being poured into a cup"

Failure observed @ 0:01

Coffee stream stops mid-air 5cm above the cup, then resumes

Documentation strength

If you need to escalate

MODERATE — Kling refunds physics-violation tickets when the failure is unambiguous and timestamped. Ambiguous physics edge-cases get debate from support.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Physics Prior Degeneration pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Physics Prior Degeneration first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Physics Prior Degeneration". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Does Kling refund credits for physics failures?

Yes for clear violations (objects passing through walls, gravity inversion). Open a ticket citing "Physics Prior Degeneration" with the timestamp.

Why does Kling produce physics-violating output?

Kling has no physics simulation — physics is encoded statistically through training video. Under fast motion or multi-object interaction the prior degenerates and produces locally plausible but globally impossible motion.

How do I reduce physics failures on Kling?

Avoid prompts with rapid object interaction (sports, splashing liquids, collisions). Slower motion + simpler scenes have a much higher success rate.

Score your prompt

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Paste your prompt and the platform you intend to use. AVA returns a red/yellow/green score against this specific failure mode plus a concrete rewrite if the risk is high.

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