Kin3514_ch11

Kin3514_ch11 - Copyright 2009 Wolters Kluwer Health |...

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Unformatted text preview: Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Click to edit Master subtitle style Chapter 11 Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Objectives Define torque and discuss the characteristics of a torque. State the angular analogs of Newton's three laws of motion and their impact on human movement. Discuss the concept of moment of inertia. Understand the impact of angular momentum on human motion. Define the concept of center of mass. Calculate the segment center of mass and the total body center of Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Objectives Discuss the relationships between torque, angular work, rotational kinetic energy, and angular power. Define and conduct a static analysis on a single joint motion. Define stability and discuss its effect on human movement. Define and conduct a dynamic analysis on a single joint motion. Define the impulse-momentum relationship. Define the work-energy relationship. Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Angular Kinetics In Chapter 10, the point of application and line of application of a force were discussed. If the line of application of the force does not pass through the axis of rotation of an object, the object will rotate. This chapter deals with the causes of angular motion, hence angular kinetics. Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins Torque or Moment of Force FIGURE 11-2 The z-axis is perpendicular to the x-y plane. In 2-D, torques act about the z- axis. A positive torque would appear to come out of the page while a negative torque would r is the perpendicular distance from the line of action of a force to the pivot point. The units of torque are Newton- meters (Nm). Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins r is the perpendicular distance from the line of action of a force to the pivot point. The units of torque are Newton- meters (Nm). FIGURE 11-3 When a force is applied, it causes no rotation if it is applied through the pivot point (A), or it generates a torque if the force is applied a distance from the axis (B and C). The moment arm (MA) is the perpendicular distance from the line of action of Torque or Moment of Force Copyright 2009 Wolters Kluwer Health | Lippincott Williams & Wilkins FIGURE 11-3 When a force is applied, it causes no rotation if it is applied...
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This note was uploaded on 11/18/2010 for the course KIN 3514 taught by Professor Lili during the Spring '09 term at LSU.

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Kin3514_ch11 - Copyright 2009 Wolters Kluwer Health |...

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