KIN 3309 1nd Edition Lecture 8 Outline of Last Lecture I Review of Mathematical Fundamentals II Review for Quiz 1 III Kinematics vs Kinetics IV Cardinal Planes V Stress and Strain VI Stress Strain Curve VII Ossification Modeling and Remodeling VIII Types of Muscle IX Myofibril and Sarcomere X Motor Unit XI Characteristics of Muscle XII Role of Muscle XIII Net Muscle Actions XIV Force Length Relationship XV Recruitment and Rate Coding XVI Reflex XVII Proprioceptive Receptors XVIII EMG These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute XIX The Shoulder Complex XX The Lower Leg XXI The Knee Joint XXII The Vertebral Column XXIII Key Muscles XXIV Effects of Aging on the Trunk Outline of Current Lecture I Human Movement Analysis II Kinematics III Linear Kinematics IV Collection of Kinematic Data V Spatial Reference Systems VI Cartesian Coordinate System VII 2 D Cartesian Coordinate System VIII Two Dimensional Reference System IX Quadrants in a Two Dimensional Reference System X Three Dimensional Reference System XI Three Dimensional Coordinate System XII Vectors and Scalars XIII Vector Magnitude XIV Distance from Origin XV Vector Components XVI Vector Direction XVII Vector Orientation XVIII Vector Orientation Standard XIX Vector Arithmetic XX Example 1a XXI Example 1b XXII Example 1c XXIII Example 1d XXIV Example 2a XXV Example 2b XXVI Example 2c XXVII Example 3 XXVIII Example 4 XXIX XXX XXXI Position and Displacement Example 5 Quiz Current Lecture For the midterm 50 will be from the fundamentals and the other 50 will be some type of calculation problem Wont have to draw vectors but you will just have to compute them I Human Movement Analysis a II Kinematics a The branch of mechanics that describes the spatial space and temporal time components of motion III Linear Kinematics a Linear kinematics deals with rectilinear straight line and curvilinear motion IV Collection of Kinematic Data a Data acquisition for quantitative analysis can take many forms i Accelerometers ii Goniometers iii Photographs iv High speed video v Optoelectric systems vi GPS b Velocity and acceleration can be computed from position data V Spatial Reference Systems a VI Cartesian Coordinate System a VII 2 D Cartesian Coordinate Systems a VIII Two Dimensional Reference System a IX Quadrants in a Two Dimensional Reference System a X Three Dimensional Reference Systems a Two dimensions are adequate for simple planar movements b Three dimensional coordinate system must be used for more complex movements i X axis horizontal sagittal plane ii Y axis vertical iii Z axis medial lateral c Some researchers use Z for the vertical axis and X and Y for the horizontal axes XI Three Dimensional Coordinate System a XII Vectors and Scalars a Scalars i Can be described by magnitude ii E g mass distance speed volume b Vectors i Have both magnitude and direction ii E g velocity force acceleration iii Vectors are represented by arrows XIII Vector Magnitude a XIV Distance from Origin a XV Vector Components a XVI Vector Direction a XVII Vector Orientation a Reference is very important b XVIII Vector Orientation Standard a XIX Vector Arithmetic a XX Example 1a a Quadrant 4 has this vector b Sin331 x 240 116 35 c Cos331 x 240 209 9 XXI Example 1b a Quadrant 3 has this vector b Sin210 x 34 17 c Cos210 x 34 29 4 XXII Example 1c a Quadrant 1 has this vector b Sin 12 x 15 3 12 c Cox12 x 15 14 67 XXIII Example 1d a Sin 90 x 20 20 b Cos 90 x 20 0 XXIV Example 2a a Magnitude would be 365 3N b XXV Example 2b a XXVI Example 2c a XXVII Example 3 a XXVIII Example 4 a XXIX Position Displacement a Position i Defines an object s location in space relative to some reference ii A scalar not to be confused with displacement b Distance i A scalar ii Change in position without direction c Displacement i Defines the change in position ii Displacement is a straight line between start and finish iii Displacement is a vector XXX Example 5 a XXXI Quiz a During a volleyball serve the ball leaves the hand with an initial velocity of 10 m s angled 41 degrees from the horizontal What are the horizontal and vertical velocities of the ball TQ i Vx 7 5 m s Vy 6 6 m s ii Vx 6 6 m s Vy 7 5 m s iii Vx 5 2 m s Vy 8 6 m s iv Vx 8 6 m s Vy 5 2 m s b Combine the following two velocity vectors to find the resultant vector Vector A 5 5 m s at 210 degrees from the horizontal and vector B 10 7 m s at 82 degrees from the horizontal i Resultant 8 51 m s Theta 67 4 degrees ii Resultant 8 51 m s Theta 112 6 degrees iii Resultant 72 3 m s Theta 22 6 degrees iv Resultant 72 3 m s Theta 112 6 degrees c Which parameter is defined as the total distance in position i Displacement the changes in position ii Distance iii Velocity iv Acceleration d A swimmer completes 10 laps in a 50 m swimming pool finishing where she started What were the linear distance and the linear displacement i Distance 500 m displacement 500 m ii Distance 500 m displacement 0m iii Distance 0m displacement 0 m iv Distance 0m displacement 500 m