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Chapter 12
Linear Kinetics of Human Movement
Basic Biomechanics, 6th edition By Susan J. Hall, Ph.D.
McGrawHill/Irwin © 2012 The McGrawHill Companies, Inc. All rights reserved.
Newton’s Laws
What is the law of inertia?
A body will maintain a state of rest or constant velocity unless acted on by an external force that changes the state.
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 12-2
Newton’s Laws
A skater has a tendency to continue gliding with constant speed and direction because of inertia.
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 12-3
Newton’s Laws
What is the law of acceleration?
A force applied to a body causes acceleration of that body
• of a magnitude proportional to the force
• in the direction of the force
• and inversely proportional to the body’s mass
F = ma
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 12-4
Newton’s Laws
What is the law of reaction?
• For every action, there is an equal and opposite reaction.
• When one body exerts a force on a second, the second body exerts a reaction force that is equal in magnitude and opposite in
direction on the first body.
Basic Biomechanics, 6th edition
By Susan J. Hall, Ph.D. 12-5
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