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Free Body Diagrams Lecture Notes Clear and concise notes taken during lecture. (Received an A)

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Kinesiology & Health Science
KINE 3030
William Gage

Free Body Diagrams  5 Steps to developing a free body diagram  Third Law: Every action has an equal and opposite reaction THEREFORE we need to look at an entire system to see all external forces of interest Mechanical Actions of Common Forces in Human Movement Rope-like Structures  Think of a tug of war  Most common  Can only pull  Forces occurs along the line of action of the structure Contact with a “Rough” Surface  Ground reaction force  Second most common  The “surface” is represented by two forces o Along the surface (friction) o Perpendicular to the surface (the normal force) which pushes against the body  The forces are located over the whole surface but we consider only the centre of pressure  Friction is a force developed between two surfaces and allows the ground to exert a big enough force on the foot to accelerate the body Contact with a “Smooth” S
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