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As long as a body is static (unmoving), the magnitude of the friction force developed is equal to that of an applied external force. Once motion is initiated, the magnitude of the friction force remains at a constant level below that of maximum static friction. Source: Linear Kinetics of Human Movement, Basic Biomechanics, 7e Citation: Hall SJ. Basic Biomechanics, 7e; 2015 Available at: http://mhmedical.com/ Accessed: August 09, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved