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KIN: Basic Concepts

What is COG? Hypothetical point at which all mass would appear to be concentrated
Where is the COG in the human body? Slightly anterior to the second sacral vertebra
What happens if the LOG falls outside the BOS? The object will fall
What happens to the object as the COG gets closer to the BOS? It becomes more stable
What happens to the object as the BOS gets larger? It becomes more stable
What is Newton's 3rd Law? Law of Reaction: For every action there is an equal and opposite reaction
What is the Law of Inertia? An object will remain at rest or in uniform motion unless acted upon by an unbalanced force
What is Newton's 2nd Law? Law of Acceleration: Acceleration of an object is proportional to the unbalanced forces acting on it and inversely proportional to the mass of that object
What are concurrent force systems? Two or more forces acting at a common point of application but in divergent directions EX: Muscle that has different heads (Delts)
Who is always the winner in levers? Force
What is a first class lever? FAR
What are examples of a first class lever? Seesaw, triceps, supraspinatus, scissors
What is a second class lever? ARF
What is always larger in a second class lever: MA of F or MA of R MA of F
What are examples of a second class lever? Going up on the balls of your feet, nutcracker, wheelbarrow
What is a third class lever? AFR
What is always larger in a third class lever: MA of F or MA of R MA of R
What are examples of third class levers? Biceps brachii, shoveling
What type of lever is better for increased ROM? Third class lever
Why is a third class lever hard to over come? Because the MA of F is so close to the axis of rotation
The muscle will be the force during what type of contraction? Concentric
The muscle will be the resistance during what type of contraction? Eccentric
What is the MA? MA = MA of F: MA of R
When is the MA greater than one? When the MA of F is larger than the MA of R
Which class of levers will always have a MA greater than one? Second class levers
What does a higher MA indicate? Better efficiency
Which class of levers will always have a MA of less than one? Third class levers
What is the formula for work? W = F x D
Where can you find the largest and strongest MA? at 90 degrees
Created by: 1185240090



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