Fundamental Limits of Shaking a Baby | Zendy

Reimann Richard J. | Zendy

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Fundamental Limits of Shaking a Baby

Author(s) -

Reimann Richard J.

Publication year - 2018

Publication title -

journal of forensic sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.715

H-Index - 96

eISSN - 1556-4029

pISSN - 0022-1198

DOI - 10.1111/1556-4029.13777

Subject(s) - angular acceleration , angular velocity , acceleration , limit (mathematics) , rotation (mathematics) , physics , poison control , head (geology) , engineering , mechanics , mathematics , classical mechanics , mathematical analysis , geology , geometry , medicine , medical emergency , geomorphology

Basic physics places limits on the mechanics involved in shaking a baby. Fundamental definitions and practical limitations are used to compare shaking with car crashes and low‐level falls. First‐order mathematical considerations applied to a 6‐month‐old infant determine an angular velocity limit for head rotation around 75 rad/s and maximum angular acceleration less than 1600 rad/s 2 without impact. By comparison, results from a low‐level fall of 0.76 m (30 inches) yield values of 83 rad/s and 13,000 rad/s 2 in a practical worst‐case scenario.

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