KNES 300 Lecture 4: Linear kinematics

• School: University of Maryland
• Department: Kinesiology
• Course: KNES 300
• Professor: Dr.Ross Miller

Document Summary

Kinematics: the study of description of motion. Evolution of motion with respect of time: time series, time history. Provides useful information for: clinical gait analysis (is the gait normal?, physical education: growth and skill acquisition, coaching: performance assessment (hatze) Can be qualitative (citius, altius, fortius higher, faster, stronger) or quantitative (5 km, 3. 5 m/s) Mathematical definition: 1st order polynomial: example: y = f x( ) = mx + b. Mechanical definition: pure translation: will assume rotation effects are negligible, not concerned with rotation (yet, segment pose: position and orientation. Need two pieces of information: magnitude (how big, direction (what direction is it going) Only need one piece of information: magnitude. Scalar does not always equal the vector after direction is taken away. Position: description of where a body is located. Distance: scalar change in position, length of path traveled, regardless of its direction. Displacement: vector change in position, direction matters (where did you stop vs. start)