MAJORFailure Reference

Pika Labs Physics Collapse — Refund Guide

Q: How do I avoid Pika physics collapse?

Keep fluid-heavy clips under 3 seconds. Specify camera position explicitly. Avoid multi-body physical interactions in a single prompt. AVA flags physics-risk prompts before generation.

Technical Classification

Physics Simulation Constraint Violation

Physics Simulation Constraint Violation on Pika Labs occurs when the model produces output that ignores fundamental physics. Like other video diffusion models, Pika has no explicit physics engine — it learns motion statistically. On prompts involving fluid dynamics, gravity, or multi-body interactions, the learned prior can collapse and ship objectively impossible motion in paid output. Most common on Pika clips longer than 3 seconds with rapid scene motion.

How to identify this failure

✕Water, rain, or snow flowing upward
✕Heavy objects floating without support
✕Collisions with no displacement, deformation, or sound implication
✕Falling objects on inverted parabolic paths
✕Cloth or hair physics moving in unnatural directions

Real generation examples

Prompt used

"Glass of red wine being knocked over and spilling on a white tablecloth"

Failure observed @ 0:02

Wine flows upward off the table instead of down; glass remains upright

Prompt used

"Snow falling on a mountain village at night, peaceful"

Failure observed @ 0:03 → 0:05

Snow falls upward toward the sky for the final 2 seconds

Documentation strength

If you need to escalate

HIGH — Physics failures on paid Pika output are objectively verifiable and clearly attributable to model error, not user input.

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 Simulation Constraint Violation 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 Simulation Constraint Violation 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 Simulation Constraint Violation". 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 Pika support response credits for physics-violation output?

Yes — Pika support honours refund tickets when physics violations are documented with timestamp evidence. Cite "Physics Simulation Constraint Violation" and include the Generation ID.

Why does Pika produce physically impossible motion?

Pika's motion prior is learned from training video. On prompts with rare physical setups (fluid + gravity + impact in <5 seconds), the model statistically interpolates rather than simulates — producing motion that looks plausible frame-by-frame but breaks Newtonian rules over time.

How do I avoid Pika physics collapse?

Keep fluid-heavy clips under 3 seconds. Specify camera position explicitly. Avoid multi-body physical interactions in a single prompt. AVA flags physics-risk prompts before generation.

Score your prompt

Score your prompt against this failure mode in 30 seconds

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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