Lecture 9.docx

# Lecture 9.docx - Diagram There’s a lot of similarities...

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Diagram There’s a lot of similarities between linear kinematics and angular kinematics just that it is an angle we are measuring compared to a linear distance o The relationship between displacement and velocity is the same in angular as linear Somebody who is doing research on pitches o Comparing underhand to overhand pitch and looking at angle in degrees Joint angle so it is a relative angle Need to define what we consider 0 and which direction is positive and negative Internal rotation is considered positive and external rotation is negative o Frames is another word for time Can convert it into time if you know frame rate o 2 pitches and we can see there is a point of release that is where ball left the hand o all of these curves are different examples angle over time and how it changes over time we would look for parts of it that it peaks because we know that is 0 if you are working with a pitcher, what you want their arm to be and that is important are the speed of the ball and accuracy speed of the ball is related to the speed of the hand at release and that is going to depend on angular velocity of joints involved o we have a flat part that is near 0, point down that is back down to the bottom of the valley which is 0 going down means negative velocity going in direction of external rotation peak is halfway and just before release it has the maximum which means it crosses 0 rules are the same in angular as linear Linear vs. Angular Motion Angular motion implies a change in orientation that separates it from curvilinear o When moving something in an angle, every part of the object goes through the same angle but not the same distance o Swinging a bat S1 is shorter than S2

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