Chapter 4 2 - Chapter4 RockingandRolling Overview...

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Click to edit Master subtitle style  9/23/11 PHED 3333 – Mechanical Principles Chapter 4 Rocking and Rolling

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9/23/11 Overview Basic principles of rotation Axis of motion Planes of motion Angular motion Athlete applications
9/23/11 Planes of Motion Cardinal Planes Sagittal (Anteroposterior) Frontal (Coronal) Transverse (Horizontal)

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Sagittal Plane Divides body vertically  into right and left  halves Example: Sit-up
Frontal Plane Divides body vertically  front and back halves Example: Jumping Jacks

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Transverse Plane Divides body into top  and bottom halves Example: Spinal rotation
9/23/11 Diagonal Plane Combination of more than one plane of  motion

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9/23/11 Axes of Motion Axis – fixed point around which angular motion  occurs Movement occurs in a plane around an axis An axis is perpendicular to a plane
9/23/11

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9/23/11 Group Work Plane Axis Shaking Head “No” Arm Curl Side Bend Toe Touch Batting Jumping Jack
9/23/11 Group work Plane Axis Shaking Head “No” T L Arm Curl S F Side Bend F S Toe Touch S F Batting T L Jumping Jack F S

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9/23/11 Levers Lever  – a rigid bar that has: an  axis  of rotation (A) or fulcrum a point at which  force  is applied (F) resistance  which must be balanced or overcome (R)
9/23/11 Levers and Torque Lever Segments Force arm  – distance between line of force application and axis Resistance arm  – distance between line of resistance and axis TORQUE a.k.a. moment arm or torque arm Resistance arm  – perpendicular distance between the axis and the point/line of resistance  application F A R FA RA

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9/23/11 Torque and length of lever arms 14 Torque = force X force  arm Or resistance X resistance arm
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9/23/11 Types of Levers First-class Lever  – axis of rotation located between  point of force application and resistance
9/23/11 Types of Levers Second-class Lever  – resistance is between force  and axis

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9/23/11 Types of Levers Third-class Lever  – force is between axis and  resistance
9/23/11

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9/23/11 Levers of the Body Levers = Bony segments of skeleton Axis  =  joints Points of force application  =  insertion of  muscles Resistance  = bony segments to be moved or  external resistance
9/23/11 1St Class Lever

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Chapter 4 2 - Chapter4 RockingandRolling Overview...

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