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Chapter 15 Human Movement in a Fluid Medium Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D. McGraw­Hill/Irwin © 2012 The McGraw­Hill Companies, Inc. All rights reserved. The Nature of Fluids What is a fluid? • a substance that flows or continuously deforms when subjected to a shear stress • both liquids and gases are fluids • air and water are fluids that commonly exert forces on the human body Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D. 15-2 The Nature of Fluids What is relative velocity? (velocity of a body with respect to the velocity of something else, such as the surrounding fluid) Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D. 15-3 The Nature of Fluids Velocity of cyclist relative to wind (20 m/s) Cyclist’s velocity (15 m/s) Head wind velocity (5 m/s) Velocity of cyclist relative to wind (10 m/s) Cyclist’s velocity (15 m/s) Tail wind velocity (5 m/s) vc/w = vc­ vw Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D. 15-4 The Nature of Fluids What is laminar flow? Laminar flow is characterized by smooth, parallel layers of fluid. Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D. 15-5 ... - tailieumienphi.vn
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