Angular Kinematics Objectives Distinguish angular motion from rectilinear and curvilinear motion Explain how segment and joint angles are measured Discuss the relationship among angular displacement, angular velocity, and angular acceleration Correctly associate associate angular kinematic quantities with their units of measure Explain the relationship between angular and linear displacement, angular and linear velocity, and angular and linear acceleration Solve quantitative problems involving angular kinematic quantities and the relationship between angular and linear quantities

Angular Kinematics Outline Reading assignment: Chapter 11 Measuring angles Relative vs absolute angles Goniometer Inclinometer Electrogoniometer Analytic calculation from 3 points in space Angular displacement Units of measurement Relationship between linear and angular motion Linear and angular acceleration Self-study problems: Introductory problems, pp 376-377: 4,5,7,10 Homework problems (due Monday, April 19): Additional problems, p 377-378: 1,10

Measuring angles of bodily segments Leighton flexometer Goniometer

Measuring joint angles Joint centers form Vertices for jt angles Segment angles Joint angles

Units of angular measurement Degrees Radians Revolutions

Relationship between linear and angular motion (kinematics)

Relationship between linear and angular motion Would you rather have a long or short baseball bat or tennis racquet? (sample problem 2, p 372)

Tangential and radial acceleration Tangential acceleration represents change in magnitude of velocity Sample prob #3, p 375 Radial acceleration represents change in direction