Biomechanics, Ch. 3
Biomechanics, Ch. 3 HSS 387, biomechanics
U of L
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HSS 387, biomechanics
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This 5 page Class Notes was uploaded by Caroline Pirtle on Monday April 18, 2016. The Class Notes belongs to HSS 387, biomechanics at University of Louisville taught by Werner in Spring 2016. Since its upload, it has received 10 views. For similar materials see Exercise Physiology in Exercise Biology at University of Louisville.
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Date Created: 04/18/16
Chapter 3 Wednesday, September 9, 2015 7:59 AM I. Basic Biomechanical factors and concepts II. Biomechanics a. Statics - constant state of motion whether at rest with no motion or moving at a constant velocity without acceleration i. Balanced - no motion b Dynamics - study of systems in motion with acceleration i. Unbalanced - motion b Kinematics - the actual amount of speed a joint is moving through; how dynamic or not dynamic a joint is c Kinetics - specific to joints within the human body; forces applied to joint and how they influence that joint II Types of machines found in the body a Mechanical advantage = load/effort i. Can influence to be better or worse at overcoming resistance b Functions of machines: i. Lever ii. Pulley II Body machines: Levers a Humans move through a system of levers b Axis (A) - joint, Force (F) - muscles causing action of joint, Resistance R - anything force has to overcome to cause a joint action c 3 classes - what changes is where axis is i. 1st - FAR 1. Axis in the middle; usually idea that the joint is balanced 2. Ex: seesaw; head ii. 2nd - ARF I Resistance is somewhere between the axis and the force II Small amount of muscle force can overcome large amount of resistance iii. 3rd - AFR I Force is applied between the axis and resistance II Can't overcome a lot of resistance but allow mobility I Factors for anatomical levers a Torque b Force arm c Resistance arm d Inverse relationship e Proportional relationship - green highlighted words f Shift the load *won't ask beyond slide 23 *I RA resistance am • bicep h -the longer am always wins idea force arm-distance that the force applied is away from the joint F son R resistance the reoffered bodyweight -Resistance arm wins because its longer. -almost all joints in the body biceps sag! F R •
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