The Forearm of a Person Holding a Book
(a. ) The biceps exert a force FB to support the weight of the forearm and the book. The triceps are assumed to be relaxed. (b.) An approximately equivalent mechanical system with the pivot at the elbow joint
Source
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"OpenStax College, Forces and Torques in Muscles and Joints. February 23, 2013."
http://cnx.org/content/m42175/latest/
OpenStax CNX
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