Lecture 4.docx

# Lecture 4.docx - Inertia Definition tendency for a body to...

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Inertia Definition: tendency for a body to resist a change in its state of motion o Often related to the mass Heavier it is the more it resists the change in motion o Angular wise it is the mass and distribution o Resistance to change in movement Mass Definition: quantity of matter contained in an object. o Mass is a scalar --- it has a magnitude. No direction to mass Symbol: m Units: kilograms (kg) o We use SI in this class so it is measured in Kg Force Definition: Simply put a push or pull acting on an object. o Force is a vector – it has a magnitude and direction. Affects how the movement occurs o Also characterized by a point of application Depending where you push something can cause a different outcome o A force is that which causes or attempts to cause a change in the motion of a body. It’s the cause Symbol: F o Multiple forces then you subscript the force of the particular thing Units: Newtons (N) o N = kg m/s^2 Common Forces in Human Movement Internal Forces o Muscle Force Actual force generated by the muscle can be quite large o Joint Force 2 forces added together Ligament Forces o Hold that joint together Bone on Bone Forces o Between the bones that make up the join External Forces o Gravity (weight) Force of gravity is also the weight of the object

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o Ground Reaction Force Ground is a huge reason why we move We push off of it and that allows us to move We perceive that we are pushing off the ground but that is the force I put on the ground Ground pushes equally and opposite on me o Friction Key Concept All forces come in pairs The force exerted by one object on another is matched by an equal and oppositely directed force by the second object on the first o Ground reaction is great example of it
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• Fall '13
• MOORE
• Force, net force, joint force, Centre of Gravity,  symbol

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