Physics

The physics dimension covers physical motion realism and temporal calibration in the default benchmark. It includes motion dynamics metrics and Physical FPS calibration against the declared physical clock.

Dimension key

physics

Rolls up into per_dimension_summary.json

Scope

Public suites

Motion dynamics and Physical FPS

Core question

Physical realism

Do motions and interactions obey plausible physical dynamics?

Scope

Metrics grouped by motion layer.

Reference motion dynamics

• fvmd
• trajan

Motion magnitude and smoothness

• motion_magnitude
• motion_smoothness

Long-sequence dynamics

• long_sequence_dynamic_degree

Temporal Calibration

Whether visible motion agrees with the declared physical clock and stays stable within a clip. These metrics audit physical tempo, not inference speed or input latency.

• physical_fps_error
• physical_fps_pct_error
• physical_fps_intra_video_cv

Reading notes

• fvmd, trajan, motion_magnitude, and motion_smoothness in the default formal suites target video motion dynamics.