Free body diagrams and vectors
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8 Terms
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Free body diagram
Isolated drawing of an object that is assumed to be rigid
* observational tool
* observational tool
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Benefits of free body diagrams
* less distractions
* Can focus on critical joint movement and posture
* Rigid segments where forces act
* Can focus on critical joint movement and posture
* Rigid segments where forces act
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Limitations of FBD
* lose context - rotation
* Perspective
* Depth
* Range of motion
* Subjectivity (of choosing joint centres)
* Perspective
* Depth
* Range of motion
* Subjectivity (of choosing joint centres)
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Vector
* arrow connecting two points
* Direction
* Magnitude
* Point of application
* Direction
* Magnitude
* Point of application
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What can vectors represent
* forces
* Motion
* Displacement (vs distance which is scalar)
* Motion
* Displacement (vs distance which is scalar)
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A vector can be ___ __into__ _____
Broken down
Components
Components
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Adding vectors
* add tip to tail - then draw resultant tail to tip
* Break down into components and add those to determine resultant
* Break down into components and add those to determine resultant
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Force
A push or pull